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CNPS Rare Plant Inventory


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154 matches found. Click on scientific name for details

Search Criteria: Scientific Name starts with H

Scientific Name Common Name Family Lifeform Blooming Period Fed List State List Global Rank State Rank CA Rare Plant Rank Other Status Threats General Habitats Microhabitats Lowest Elevation (m) Highest Elevation (m) Lowest Elevation (ft) Highest Elevation (ft) CA Endemic Date Added Photo
Hartmaniella sierrae Sierra starwort Caryophyllaceae perennial rhizomatous herb May-Aug None None G3G4 S3S4 4.2 Chaparral, Cismontane woodland, Lower montane coniferous forest, Upper montane coniferous forest 1225 2194 4020 7200 Yes 2004-01-01
No Photo Available
Hemizonia congesta ssp. calyculata Mendocino tarplant Asteraceae annual herb Jul-Nov None None G5T4 S4 4.3 Cismontane woodland, Valley and foothill grassland Serpentine (sometimes) 225 1400 740 4595 Yes 1974-01-01 Photo of Hemizonia congesta ssp. calyculata
© 2015 John Doyen
Hemizonia congesta ssp. congesta congested-headed hayfield tarplant Asteraceae annual herb Apr-Nov None None G5T2 S2 1B.2 SB_UCBG Agriculture, Development, Disking, Foot traffic/trampling, Grazing, Non-native plant impacts, Other, Road/trail construction/maint. Valley and foothill grassland Roadsides (sometimes) 20 560 65 1835 Yes 1988-01-01 Photo of Hemizonia congesta ssp. congesta
© 2015 Vernon Smith
Harpagonella palmeri Palmer's grapplinghook Boraginaceae annual herb Mar-May None None G4 S3 4.2 SB_CalBG/RSABG; SB_CRES Agriculture, Development, Disking, Foot traffic/trampling, Grazing, Military operations, Mining, Non-native plant impacts, ORV activity, Recreational use (non-ORV), Road/trail construction/maint., Surface water diversion Chaparral, Coastal scrub, Valley and foothill grassland Clay, Openings 20 955 65 3135 1980-01-01 Photo of Harpagonella palmeri
© 2015 Keir Morse
Hazardia cana San Clemente Island hazardia Asteraceae perennial evergreen shrub Jun-Sep None None G3 S3 1B.2 Coastal bluff scrub, Coastal scrub, Riparian forest 60 500 195 1640 1974-01-01 Photo of Hazardia cana
© 2009 Zoya Akulova
Hazardia detonsa island hazardia Asteraceae perennial evergreen shrub Mar-Nov None None G4 S4 4.3 SB_CalBG/RSABG Chaparral, Closed-cone coniferous forest, Coastal scrub Rocky, Volcanic 5 580 15 1905 Yes 1974-01-01 Photo of Hazardia detonsa
© 2009 Zoya Akulova
Hazardia orcuttii Orcutt's hazardia Asteraceae perennial evergreen shrub Aug-Oct None CT G1 S1 1B.1 SB_CalBG/RSABG Development, Erosion/runoff, Foot traffic/trampling, Improper burning regime, Insufficient population/stand size, Non-native plant impacts, ORV activity, Recreational use (non-ORV) Chaparral (maritime), Coastal scrub Clay (often) 80 85 260 280 1984-01-01 Photo of Hazardia orcuttii
© 2011 Keir Morse
Helianthella castanea Diablo helianthella Asteraceae perennial herb Mar-Jun None None G2 S2 1B.2 SB_CalBG/RSABG Development, Erosion/runoff, Foot traffic/trampling, Grazing, Improper burning regime, Insufficient population/stand size, Non-native plant impacts, Other, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter, Wood cutting or brush clearing Broadleafed upland forest, Chaparral, Cismontane woodland, Coastal scrub, Riparian woodland, Valley and foothill grassland Rocky (usually) 60 1300 195 4265 Yes 1974-01-01 Photo of Helianthella castanea
© 2013 Christopher Bronny
Hesperolinon adenophyllum glandular western flax Linaceae annual herb May-Aug None None G2G3 S2S3 1B.2 BLM_S Biocides, Development, Erosion/runoff, Grazing, Logging, ORV activity, Other, Road/trail construction/maint., Vandalism/dumping/litter Chaparral, Cismontane woodland, Valley and foothill grassland Serpentine (usually) 150 1315 490 4315 Yes 1974-01-01 Photo of Hesperolinon adenophyllum
© 2002 John Game
Hesperolinon bicarpellatum two-carpellate western flax Linaceae annual herb (Apr)May-Jul None None G2 S2 1B.2 BLM_S; SB_UCSC Development, Erosion/runoff, Grazing, Other, Road/trail construction/maint. Chaparral (serpentinite) 60 1005 195 3295 Yes 1974-01-01 Photo of Hesperolinon bicarpellatum
© 2016 John Doyen
Hesperolinon breweri Brewer's western flax Linaceae annual herb May-Jul None None G2 S2 1B.2 Dam/Inundation, Development, Erosion/runoff, Foot traffic/trampling, Grazing, Landfill, Non-native plant impacts, Other, Recreational use (non-ORV), Road/trail construction/maint. Chaparral, Cismontane woodland, Valley and foothill grassland Serpentine (usually) 30 945 100 3100 Yes 1974-01-01 Photo of Hesperolinon breweri
© 2014 Neal Kramer
Hesperolinon congestum Marin western flax Linaceae annual herb Apr-Jul FT CT G1 S1 1B.1 SB_CalBG/RSABG; SB_UCBG Biocides, Dam/Inundation, Development, Disking, Erosion/runoff, Foot traffic/trampling, Grazing, Non-native plant impacts, Other, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter Chaparral, Valley and foothill grassland Serpentine 5 370 15 1215 Yes 1974-01-01 Photo of Hesperolinon congestum
© 2009 Neal Kramer
Hesperolinon didymocarpum Lake County western flax Linaceae annual herb May-Jul None CE G1 S1 1B.2 SB_UCSC Dam/Inundation, Erosion/runoff, Grazing, Other, Recreational use (non-ORV) Chaparral, Cismontane woodland, Valley and foothill grassland Serpentine 330 365 1085 1200 Yes 1974-01-01 Photo of Hesperolinon didymocarpum
© 2018 Aaron Arthur
Hesperolinon drymarioides drymaria-like western flax Linaceae annual herb May-Aug None None G2 S2 1B.2 BLM_S; USFS_S Development, Mining, ORV activity, Road/trail construction/maint., Wood cutting or brush clearing Chaparral, Cismontane woodland, Closed-cone coniferous forest, Valley and foothill grassland Serpentine 100 1130 330 3710 Yes 1974-01-01 Photo of Hesperolinon drymarioides
© Niall McCarten and CNPS
Heuchera abramsii Abrams' alumroot Saxifragaceae perennial rhizomatous herb Jul-Aug None None G3 S3 4.3 SB_CalBG/RSABG; USFS_S Upper montane coniferous forest (rocky) 2800 3500 9185 11485 Yes 1974-01-01 Photo of Heuchera abramsii
© 2005 Charles E. Jones
Hesperidanthus jaegeri Jaeger's hesperidanthus Brassicaceae perennial herb May-Jul None None G2 S2 1B.2 BLM_S; SB_CalBG/RSABG; USFS_S Mining, Non-native animal impacts, Non-native plant impacts, ORV activity, Recreational use (non-ORV) Great Basin scrub, Pinyon and juniper woodland, Subalpine coniferous forest Carbonate, Rocky 2135 2800 7005 9185 Yes 1974-01-01 Photo of Hesperidanthus jaegeri
© 2011 Steve Matson
Hooveria purpurea var. purpurea Santa Lucia purple amole Agavaceae perennial bulbiferous herb Apr-Jun FT None G2T2 S2 1B.1 SB_SBBG Development, Erosion/runoff, Feral pigs, Foot traffic/trampling, Grazing, Improper burning regime, Military operations, Non-native plant impacts, ORV activity, Other, Road/trail construction/maint. Chaparral, Cismontane woodland, Valley and foothill grassland Clay, Gravelly 205 385 675 1265 Yes 1974-01-01
No Photo Available
Hooveria purpurea var. reducta Camatta Canyon amole Agavaceae perennial bulbiferous herb Apr-May FT CR G2T1 S1 1B.1 SB_SBBG Agriculture, Foot traffic/trampling, Grazing, Non-native plant impacts, ORV activity, Other, Road/trail construction/maint. Cismontane woodland, Valley and foothill grassland 305 630 1000 2065 Yes 1974-01-01
No Photo Available
Hesperocyparis abramsiana var. abramsiana Santa Cruz cypress Cupressaceae perennial evergreen tree FT CE G1T1 S1 1B.2 SB_CalBG/RSABG; SB_UCSC Agriculture, Development, Erosion/runoff, Hybridization, Improper burning regime, Logging, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter, Wood cutting or brush clearing Chaparral, Closed-cone coniferous forest, Lower montane coniferous forest Granitic (sometimes), Sandstone (sometimes) 280 800 920 2625 Yes 1974-01-01 Photo of Hesperocyparis abramsiana var. abramsiana
© 2012 Neal Kramer
Hesperocyparis bakeri Baker cypress Cupressaceae perennial evergreen tree None None G3 S3 4.2 IUCN_VU; SB_CalBG/RSABG; SB_KewBG; SB_USDA Chaparral, Lower montane coniferous forest Serpentine (sometimes), Volcanic (sometimes) 820 1995 2690 6545 1974-01-01 Photo of Hesperocyparis bakeri
© 2021 Scot Loring
Hesperocyparis forbesii Tecate cypress Cupressaceae perennial evergreen tree None None G2 S2 1B.1 BLM_S; SB_CalBG/RSABG; SB_CRES; SB_UCSC; SB_USDA; USFS_S Development, Foot traffic/trampling, Grazing, Improper burning regime, Landfill, Mining, Non-native plant impacts, Other, Recreational use (non-ORV), Road/trail construction/maint. Chaparral, Closed-cone coniferous forest Clay, Gabbroic (sometimes) 80 1500 260 4920 1974-01-01 Photo of Hesperocyparis forbesii
© 2011 Joey Malone
Hesperocyparis goveniana Gowen cypress Cupressaceae perennial evergreen tree FT None G1 S1 1B.2 IUCN_EN; SB_CalBG/RSABG; SB_UCSC Development, Improper burning regime, Non-native plant impacts Chaparral (maritime), Closed-cone coniferous forest 30 300 100 985 Yes 1980-01-01 Photo of Hesperocyparis goveniana
© 2016 Susan McDougall
Hesperocyparis macrocarpa Monterey cypress Cupressaceae perennial evergreen tree None None G1 S1 1B.2 IUCN_VU; SB_CalBG/RSABG Development, Foot traffic/trampling Closed-cone coniferous forest 10 30 35 100 Yes 1980-01-01 Photo of Hesperocyparis macrocarpa
© 2021 Scot Loring
Hesperocyparis nevadensis Piute cypress Cupressaceae perennial evergreen tree None None G2 S2 1B.2 BLM_S; SB_CalBG/RSABG; SB_USDA Grazing, Improper burning regime, Mining, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint. Chaparral, Cismontane woodland, Closed-cone coniferous forest, Pinyon and juniper woodland 720 1830 2360 6005 Yes 1974-01-01 Photo of Hesperocyparis nevadensis
© 2012 Joey Malone
Hesperocyparis pygmaea pygmy cypress Cupressaceae perennial evergreen tree None None G1 S1 1B.2 BLM_S; SB_CalBG/RSABG Altered flood/tidal/hydrologic regime, Development, Erosion/runoff, Foot traffic/trampling, Landfill, Logging, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter, Wood cutting or brush clearing Closed-cone coniferous forest (usually podzol-like soil) 30 600 100 1970 Yes 1974-01-01 Photo of Hesperocyparis pygmaea
© 2009 Neal Kramer
Hesperocyparis stephensonii Cuyamaca cypress Cupressaceae perennial evergreen tree None None G1 S1 1B.1 SB_CalBG/RSABG; USFS_S Improper burning regime Chaparral, Cismontane woodland, Closed-cone coniferous forest, Riparian forest Gabbroic 1035 1705 3395 5595 1980-01-01 Photo of Hesperocyparis stephensonii
© 2011 Joey Malone
Harmonia guggolziorum Guggolz's harmonia Asteraceae annual herb Apr-May None None G1 S1 1B.1 SB_UCSC Agriculture, Development, Grazing, Non-native plant impacts, Road/trail construction/maint. Chaparral (openings, serpentinite) 160 195 525 640 Yes 2004-01-01 Photo of Harmonia guggolziorum
© 2019 Steve Matson
Harmonia doris-nilesiae Niles' harmonia Asteraceae annual herb May-Jul None None G2G3 S2S3 1B.1 SB_UCSC; USFS_S Logging, Mining, Non-native plant impacts, Other, Road/trail construction/maint. Chaparral, Cismontane woodland, Lower montane coniferous forest Openings, Rocky, Serpentine (usually) 650 1660 2135 5445 Yes 1988-01-01 Photo of Harmonia doris-nilesiae
©2013 Julie Kierstead Nelson
Hackelia amethystina amethyst stickseed Boraginaceae perennial herb Jun-Jul(Aug) None None G4 S4 4.3 Lower montane coniferous forest, Meadows and seeps, Upper montane coniferous forest Disturbed areas, Openings 1500 2315 4920 7595 Yes 1974-01-01 Photo of Hackelia amethystina
© 2018 John Doyen
Hackelia brevicula Poison Canyon stickseed Boraginaceae perennial herb Jul-Aug None None G3 S3 3.3 Grazing Broadleafed upland forest, Great Basin scrub, Subalpine coniferous forest Openings, Rocky (often) 2600 3200 8530 10500 1974-01-01 Photo of Hackelia brevicula
© 2015 Steve Matson
Hackelia cusickii Cusick's stickseed Boraginaceae perennial herb Apr-Jul None None G4 S3S4 4.3 Alpine boulder and rock field, Pinyon and juniper woodland (rocky loam), Subalpine coniferous forest 1200 2000 3935 6560 1974-01-01 Photo of Hackelia cusickii
©1998 Dan Post
Hackelia sharsmithii Sharsmith's stickseed Boraginaceae perennial herb Jul-Sep None None G3 S3 2B.3 SB_CalBG/RSABG Other Alpine boulder and rock field, Subalpine coniferous forest Granitic, Rocky 3000 3700 9845 12140 1974-01-01 Photo of Hackelia sharsmithii
© 2017 Steve Matson
Helianthus exilis G3 S3 CBR Photo of Helianthus exilis
©2004 David A. Tharp
Helianthus niveus ssp. tephrodes Algodones Dunes sunflower Asteraceae perennial herb Sep-May None CE G4T2T3 S1 1B.2 BLM_S; SB_CalBG/RSABG; SB_USDA ORV activity, Other Desert dunes 50 100 165 330 1974-01-01 Photo of Helianthus niveus ssp. tephrodes
© 2014 Keir Morse
Helianthus nuttallii ssp. parishii Los Angeles sunflower Asteraceae perennial rhizomatous herb Aug-Oct None None G5TX SX 1A Altered flood/tidal/hydrologic regime, Development Marshes and swamps (freshwater, coastal salt) 10 1525 35 5005 Yes 1974-01-01
No Photo Available
Hemizonia congesta ssp. tracyi Tracy's tarplant Asteraceae annual herb (Mar-Apr)May-Oct None None G5T4 S4 4.3 Coastal prairie, Lower montane coniferous forest, North Coast coniferous forest Openings, Serpentine (sometimes) 120 1200 395 3935 Yes 1974-01-01 Photo of Hemizonia congesta ssp. tracyi
© 2016 Steve Matson
Herissantia crispa curly herissantia Malvaceae annual/perennial herb (Apr)Aug-Sep None None G5 S1 2B.3 Sonoran desert scrub 700 725 2295 2380 1988-01-01
No Photo Available
Heuchera brevistaminea Laguna Mountains alumroot Saxifragaceae perennial rhizomatous herb Apr-Jul(Sep) None None G2 S2 1B.3 BLM_S; SB_CRES Altered flood/tidal/hydrologic regime, Development, Foot traffic/trampling, Non-native plant impacts, Vandalism/dumping/litter Broadleafed upland forest, Chaparral, Cismontane woodland, Riparian forest Rocky 1370 2000 4495 6560 Yes 1974-01-01 Photo of Heuchera brevistaminea
© 2019 Susan McDougall
Heuchera caespitosa urn-flowered alumroot Saxifragaceae perennial rhizomatous herb May-Aug None None G3 S3 4.3 SB_CalBG/RSABG; USFS_S Cismontane woodland, Lower montane coniferous forest, Riparian forest (montane), Upper montane coniferous forest Rocky 1155 2650 3790 8695 Yes 1974-01-01 Photo of Heuchera caespitosa
© 2015 Keir Morse
Heuchera hirsutissima shaggy-haired alumroot Saxifragaceae perennial rhizomatous herb (May)Jun-Jul None None G3 S3 1B.3 SB_CalBG/RSABG; USFS_S Erosion/runoff, Foot traffic/trampling Subalpine coniferous forest, Upper montane coniferous forest Granitic, Rocky 1520 3500 4985 11485 Yes 1974-01-01 Photo of Heuchera hirsutissima
© 2009 Thomas Stoughton
Heuchera rubescens var. versicolor San Diego County alumroot Saxifragaceae perennial rhizomatous herb May-Jun None None G5T4 S2 3.3 Chaparral, Lower montane coniferous forest Rocky 1500 4000 4920 13125 1974-01-01 Photo of Heuchera rubescens var. versicolor
© 2013 Richard Spellenberg
Heuchera maxima island alumroot Saxifragaceae perennial rhizomatous herb Feb-May None None G3 S3 1B.2 SB_SBBG Erosion/runoff Chaparral, Cismontane woodland, Coastal bluff scrub, Coastal scrub Rocky 10 500 35 1640 Yes 1974-01-01 Photo of Heuchera maxima
© 2014 Steve Matson
Heuchera parishii Parish's alumroot Saxifragaceae perennial rhizomatous herb Jun-Aug None None G3 S3 1B.3 SB_CalBG/RSABG; USFS_S Foot traffic/trampling, Improper burning regime, Mining, Recreational use (non-ORV), Road/trail construction/maint. Alpine boulder and rock field, Lower montane coniferous forest, Subalpine coniferous forest, Upper montane coniferous forest Carbonate (sometimes), Rocky 1500 3800 4920 12470 Yes 1974-01-01 Photo of Heuchera parishii
© 2015 Keir Morse
Hibiscus lasiocarpos var. occidentalis woolly rose-mallow Malvaceae perennial rhizomatous herb (emergent) Jun-Sep None None G5T3 S3 1B.2 SB_CalBG/RSABG; SB_UCBG Agriculture, Altered flood/tidal/hydrologic regime, Biocides, Dam/Inundation, Degraded water quality, Development, Erosion/runoff, Foot traffic/trampling, Grazing, Improper burning regime, Mining, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Surface water diversion, Waterway bank protection/maintenance, Wood cutting or brush clearing Marshes and swamps (freshwater) 0 120 0 395 Yes 1974-01-01 Photo of Hibiscus lasiocarpos var. occidentalis
© 2020 Steven Perry
Holocarpha macradenia Santa Cruz tarplant Asteraceae annual herb Jun-Oct FT CE G1 S1 1B.1 SB_CalBG/RSABG; SB_UCBG Agriculture, Development, Foot traffic/trampling, Grazing, Mining, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint. Coastal prairie, Coastal scrub, Valley and foothill grassland Clay (often), Sandy 10 220 35 720 Yes 1974-01-01 Photo of Holocarpha macradenia
© 2011 Dylan Neubauer
Horkelia bolanderi Bolander's horkelia Rosaceae perennial herb (May)Jun-Aug None None G1 S1 1B.2 BLM_S Agriculture, Altered flood/tidal/hydrologic regime, Dam/Inundation, Development, Erosion/runoff, Foot traffic/trampling, Improper burning regime, Non-native plant impacts, ORV activity, Road/trail construction/maint., Surface water diversion Chaparral, Lower montane coniferous forest, Meadows and seeps, Valley and foothill grassland Edges, Vernally Mesic 450 1100 1475 3610 Yes 1988-01-01 Photo of Horkelia bolanderi
© 2012 Barry Rice
Horkelia congesta var. nemorosa Josephine horkelia Rosaceae perennial herb May-Jul None None G4T4? S1 2B.1 North Coast coniferous forest (clay, serpentinite seeps) 300 800 985 2625 1988-01-01 Photo of Horkelia congesta var. nemorosa
© 2011 Doreen L. Smith
Horkelia cuneata var. sericea Kellogg's horkelia Rosaceae perennial herb Apr-Sep None None G4T1? S1? 1B.1 SB_CalBG/RSABG; SB_UCSC; USFS_S Development, Erosion/runoff, Insufficient population/stand size, Non-native plant impacts, ORV activity, Other, Road/trail construction/maint. Chaparral (maritime), Closed-cone coniferous forest, Coastal dunes, Coastal scrub Gravelly (sometimes), Openings, Sandy (sometimes) 10 200 35 655 Yes 1988-01-01 Photo of Horkelia cuneata var. sericea
© 2018 Neal Kramer
Horkelia hendersonii Henderson's horkelia Rosaceae perennial herb Jun-Aug None None G1 S1 1B.1 SB_BerrySB; SB_CalBG/RSABG; USFS_S Road/trail construction/maint. Upper montane coniferous forest (granitic) 2000 2300 6560 7545 1988-01-01 Photo of Horkelia hendersonii
© 2021 Scot Loring
Horkelia hispidula White Mountains horkelia Rosaceae perennial herb Jun-Aug None None G3 S3 1B.3 SB_CalBG/RSABG; USFS_S Foot traffic/trampling, Grazing, Other, Road/trail construction/maint. Alpine dwarf scrub, Great Basin scrub, Subalpine coniferous forest 3000 3400 9845 11155 1974-01-01 Photo of Horkelia hispidula
© 2012 Steve Matson
Horkelia marinensis Point Reyes horkelia Rosaceae perennial herb May-Sep None None G2 S2 1B.2 SB_CalBG/RSABG; SB_UCSC Altered flood/tidal/hydrologic regime, Development, Erosion/runoff, Foot traffic/trampling, Grazing, Non-native plant impacts, Other, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter Coastal dunes, Coastal prairie, Coastal scrub Sandy 5 755 15 2475 Yes 1974-01-01 Photo of Horkelia marinensis
© 2017 John Doyen
Horkelia parryi Parry's horkelia Rosaceae perennial herb Apr-Sep None None G2 S2 1B.2 BLM_S; USFS_S Biocides, Erosion/runoff, Grazing, Improper burning regime, Logging, Mining, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter, Wood cutting or brush clearing Chaparral, Cismontane woodland 80 1070 260 3510 Yes 1974-01-01 Photo of Horkelia parryi
© 2009 Barry Breckling
Horkelia sericata silky horkelia Rosaceae perennial herb Jun-Aug None None G3G4 S3 4.3 Chaparral, Lower montane coniferous forest Clay, Serpentine 180 1200 590 3935 1974-01-01 Photo of Horkelia sericata
© 2015 John Doyen
Horkelia tenuiloba thin-lobed horkelia Rosaceae perennial herb May-Jul(Aug) None None G2 S2 1B.2 SB_CalBG/RSABG Agriculture, Biocides, Development, Disking, Foot traffic/trampling, Grazing, Non-native plant impacts, Recreational use (non-ORV), Road/trail construction/maint. Broadleafed upland forest, Chaparral, Valley and foothill grassland Mesic, Openings, Sandy 50 500 165 1640 Yes 1988-01-01 Photo of Horkelia tenuiloba
© 1994 Doreen L. Smith
Horkelia truncata Ramona horkelia Rosaceae perennial herb May-Jun None None G3 S3 1B.3 BLM_S; SB_CalBG/RSABG; SB_CRES; SB_UCBG; USFS_S Foot traffic/trampling, Improper burning regime, Military operations, Mining, Recreational use (non-ORV), Road/trail construction/maint. Chaparral, Cismontane woodland Clay, Gabbroic 400 1300 1310 4265 1974-01-01 Photo of Horkelia truncata
© 2008 Andrew Borcher
Horkelia tularensis Kern Plateau horkelia Rosaceae perennial herb (May)Jun-Aug None None G2 S2 1B.3 SB_CalBG/RSABG; USFS_S Foot traffic/trampling, Grazing, Logging, ORV activity Upper montane coniferous forest (rocky) 2255 2875 7400 9435 Yes 1974-01-01 Photo of Horkelia tularensis
© 2003 Christopher L. Christie
Horkelia wilderae Barton Flats horkelia Rosaceae perennial herb May-Sep None None G1 S1 1B.1 SB_CalBG/RSABG; USFS_S Development, Foot traffic/trampling, Recreational use (non-ORV), Road/trail construction/maint. Chaparral (edges), Lower montane coniferous forest, Upper montane coniferous forest 1675 2925 5495 9595 Yes 1974-01-01 Photo of Horkelia wilderae
© 2009 Thomas Stoughton
Howellia aquatilis water howellia Campanulaceae annual herb (aquatic) Jun FD None G3 S2 2B.2 Foot traffic/trampling, Non-native plant impacts, Other Marshes and swamps (freshwater) 1085 1290 3560 4230 1974-01-01 Photo of Howellia aquatilis
©2018 John Doyen
Hulsea brevifolia short-leaved hulsea Asteraceae perennial herb May-Aug None None G3 S3 1B.2 SB_CalBG/RSABG; USFS_S Erosion/runoff, Foot traffic/trampling, Grazing, Insufficient population/stand size, Logging, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint. Lower montane coniferous forest, Upper montane coniferous forest Granitic (sometimes), Gravelly (sometimes), Sandy (sometimes), Volcanic (sometimes) 1500 3200 4920 10500 Yes 1974-01-01 Photo of Hulsea brevifolia
© 2009 Keir Morse
Hulsea californica San Diego sunflower Asteraceae perennial herb Apr-Jun None None G3 S3 1B.3 BLM_S; SB_CalBG/RSABG; SB_CRES Development, Foot traffic/trampling, Non-native plant impacts, ORV activity, Other, Road/trail construction/maint. Chaparral, Lower montane coniferous forest, Upper montane coniferous forest Burned areas, Openings 915 2915 3000 9565 Yes 1974-01-01 Photo of Hulsea californica
© 2015 Keir Morse
Hulsea vestita ssp. inyoensis Inyo hulsea Asteraceae perennial herb Apr-Jun None None G5T2T3 S1S2 2B.2 Erosion/runoff, Mining, Recreational use (non-ORV), Road/trail construction/maint. Chenopod scrub, Great Basin scrub, Pinyon and juniper woodland Rocky 1645 3000 5395 9845 1980-01-01 Photo of Hulsea vestita ssp. inyoensis
© 2011 Steve Matson
Hosackia crassifolia var. otayensis Otay Mountain lotus Fabaceae perennial herb May-Aug None None G5T1 S1 1B.1 BLM_S; SB_CalBG/RSABG; SB_CRES Road/trail construction/maint. Chaparral (metavolcanic, often disturbed areas) 380 1005 1245 3295 1984-01-01 Photo of Hosackia crassifolia var. otayensis
© 2020 Keir Morse
Hosackia oblongifolia var. cuprea copper-flowered bird's-foot trefoil Fabaceae perennial rhizomatous herb Jun-Aug None None G5T2 S2 1B.3 SB_CalBG/RSABG Meadows and seeps (edges), Upper montane coniferous forest Mesic 2400 2750 7875 9025 Yes 1974-01-01 Photo of Hosackia oblongifolia var. cuprea
© 2018 Mary Merriman
Hosackia yollabolliensis Yolla Bolly Mtns. bird's-foot trefoil Fabaceae perennial herb Jun-Aug None None G2 S2 1B.2 SB_CalBG/RSABG ORV activity, Other Meadows and seeps, Upper montane coniferous forest (openings) Dry, Gravelly (often), Slopes 1645 2135 5395 7005 Yes 1974-01-01 Photo of Hosackia yollabolliensis
2013 Shasta-Trinity National Forest
Harmonia hallii Hall's harmonia Asteraceae annual herb (Mar)Apr-Jun None None G2? S2? 1B.2 BLM_S; SB_CalBG/RSABG Development, Grazing, ORV activity, Road/trail construction/maint. Chaparral (serpentinite) 305 975 1000 3200 Yes 1984-01-01 Photo of Harmonia hallii
© 2015 John Doyen
Harmonia nutans nodding harmonia Asteraceae annual herb Mar-May None None G3 S3 4.3 SB_UCBG Chaparral, Cismontane woodland Gravelly (sometimes), Rocky (sometimes), Volcanic 75 975 245 3200 Yes 1984-01-01 Photo of Harmonia nutans
© 2008 Neal Kramer
Harmonia stebbinsii Stebbins' harmonia Asteraceae annual herb May-Jun None None G2 S2 1B.2 BLM_S; SB_UCSC; USFS_S Improper burning regime, Logging, Mining, Non-native plant impacts, Road/trail construction/maint. Chaparral, Lower montane coniferous forest Serpentine 400 1580 1310 5185 Yes 1980-01-01 Photo of Harmonia stebbinsii
©2019 Steve Matson
Holmgrenanthe petrophila rock lady Plantaginaceae perennial herb Apr-Jun None CR G1 S1 1B.2 SB_CalBG/RSABG Foot traffic/trampling, Road/trail construction/maint. Mojavean desert scrub (carbonate, rocky) 515 1675 1690 5495 Yes 1974-01-01
No Photo Available
Howellanthus dalesianus Scott Mountain howellanthus Hydrophyllaceae perennial herb May-Jul(Aug) None None G3 S3 4.3 Erosion/runoff, Foot traffic/trampling, Grazing, Logging, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint. Lower montane coniferous forest, Meadows and seeps, Subalpine coniferous forest, Upper montane coniferous forest Serpentine 1025 2105 3365 6905 Yes 1974-01-01 Photo of Howellanthus dalesianus
Aaron Schusteff 2008
Hesperevax sparsiflora var. brevifolia short-leaved evax Asteraceae annual herb Mar-Jun None None G4T3 S3 1B.2 BLM_S; SB_CalBG/RSABG Development, Erosion/runoff, Foot traffic/trampling, Grazing, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint. Coastal bluff scrub (sandy), Coastal dunes, Coastal prairie 0 215 0 705 1994-01-01 Photo of Hesperevax sparsiflora var. brevifolia
© 2006 Doreen L. Smith
Hesperolinon serpentinum CBR 1994-01-01
No Photo Available
Hesperolinon tehamense Tehama County western flax Linaceae annual herb May-Jul None None G2 S2 1B.3 BLM_S Non-native plant impacts, Other, Road/trail construction/maint. Chaparral, Cismontane woodland Serpentine 100 1250 330 4100 Yes 1994-01-01 Photo of Hesperolinon tehamense
© 2018 John Doyen
Heterotheca shevockii Shevock's golden-aster Asteraceae perennial herb Aug-Nov None None G2 S2 1B.3 SB_CalBG/RSABG; USFS_S Foot traffic/trampling, Recreational use (non-ORV), Road/trail construction/maint. Chaparral, Cismontane woodland Sandy 230 900 755 2955 Yes 1994-01-01 Photo of Heterotheca shevockii
© 2017 Chris Winchell
Holocarpha virgata ssp. elongata graceful tarplant Asteraceae annual herb May-Nov None None G5T3 S3 4.2 SB_CRES Chaparral, Cismontane woodland, Coastal scrub, Valley and foothill grassland 60 1100 195 3610 Yes 1994-01-01 Photo of Holocarpha virgata ssp. elongata
© 2013 Anna Bennett
Hordeum intercedens vernal barley Poaceae annual herb Mar-Jun None None G3G4 S3S4 3.2 SB_CalBG/RSABG Coastal dunes, Coastal scrub, Valley and foothill grassland (depressions, saline flats), Vernal pools 5 1000 15 3280 1994-01-01
No Photo Available
Horkelia yadonii Santa Lucia horkelia Rosaceae perennial rhizomatous herb Apr-Jul None None G3 S3 4.2 USFS_S Broadleafed upland forest, Chaparral, Cismontane woodland, Meadows and seeps, Riparian woodland Granitic, Sandy 300 1900 985 6235 Yes 1994-01-01 Photo of Horkelia yadonii
© 2012 Chris Winchell
Hulsea mexicana Mexican hulsea Asteraceae annual/perennial herb Apr-Jun None None G3 S1 2B.3 SB_CalBG/RSABG Chaparral (often burned areas or disturbed areas, volcanic) 1200 1200 3935 3935 1994-01-01 Photo of Hulsea mexicana
© 2018 Aaron Schusteff
Hulsea vestita ssp. callicarpha beautiful hulsea Asteraceae perennial herb May-Oct None None G5T4 S4 4.2 SB_CalBG/RSABG Chaparral, Lower montane coniferous forest Granitic, Gravelly (sometimes), Rocky (sometimes) 915 3050 3000 10005 Yes 1994-01-01 Photo of Hulsea vestita ssp. callicarpha
© 2015 Keir Morse
Hulsea vestita ssp. gabrielensis San Gabriel Mountains sunflower Asteraceae perennial herb May-Jul None None G5T3 S3 4.3 SB_CalBG/RSABG; USFS_S Lower montane coniferous forest, Upper montane coniferous forest Rocky 1500 2500 4920 8205 Yes 1994-01-01 Photo of Hulsea vestita ssp. gabrielensis
© 2013 Anuja Parikh and Nathan Gale
Hulsea vestita ssp. parryi Parry's sunflower Asteraceae perennial herb Apr-Aug None None G5T4 S4 4.3 SB_CalBG/RSABG Lower montane coniferous forest, Pinyon and juniper woodland, Upper montane coniferous forest Carbonate (sometimes), Granitic (sometimes), Openings, Rocky 1370 2895 4495 9500 Yes 1994-01-01 Photo of Hulsea vestita ssp. parryi
© 2015 Keir Morse
Hedeoma nana ssp. californica California mock pennyroyal Lamiaceae perennial herb Apr-Jun None None G5T4 S4 4.3 SB_CalBG/RSABG Joshua tree "woodland", Pinyon and juniper woodland Carbonate (often), Rocky 855 2100 2805 6890 2001-01-01 Photo of Hedeoma nana ssp. californica
© 2008 Steve Matson
Hesperevax caulescens hogwallow starfish Asteraceae annual herb Mar-Jun None None G3 S3 4.2 Valley and foothill grassland (mesic clay), Vernal pools (shallow) Alkaline (sometimes) 0 505 0 1655 Yes 2001-01-01 Photo of Hesperevax caulescens
© 2017 John Doyen
Heterotheca monarchensis Monarch golden-aster Asteraceae perennial herb May-Oct None None G2 S2 1B.1 USFS_S Non-native plant impacts Cismontane woodland (carbonate) 1095 1850 3595 6070 Yes 2001-01-01
No Photo Available
Hoita strobilina Loma Prieta hoita Fabaceae perennial herb May-Jul(Aug-Oct) None None G2? S2? 1B.1 SB_CalBG/RSABG Development, Erosion/runoff, Feral pigs, Foot traffic/trampling, Grazing, Improper burning regime, Insufficient population/stand size, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Wood cutting or brush clearing Chaparral, Cismontane woodland, Riparian woodland Mesic, Serpentine (usually) 30 860 100 2820 Yes 2001-01-01 Photo of Hoita strobilina
© 2004 Janell Hillman
Horkelia cuneata var. puberula mesa horkelia Rosaceae perennial herb Feb-Jul(Sep) None None G4T1 S1 1B.1 SB_CalBG/RSABG; USFS_S Development, Landfill, Mining, Non-native plant impacts, Other, Road/trail construction/maint., Wood cutting or brush clearing Chaparral (maritime), Cismontane woodland, Coastal scrub Gravelly (sometimes), Sandy (sometimes) 70 810 230 2660 Yes 2001-01-01 Photo of Horkelia cuneata var. puberula
© 2008 Tony Morosco
Horsfordia alata pink velvet-mallow Malvaceae perennial shrub Feb-Dec None None G5 S4 4.3 SB_CalBG/RSABG Sonoran desert scrub (rocky) 100 500 330 1640 2001-01-01
No Photo Available
Horsfordia newberryi Newberry's velvet-mallow Malvaceae perennial shrub Feb-Dec None None G5 S4 4.3 SB_CalBG/RSABG Sonoran desert scrub (rocky) 3 800 10 2625 2001-01-01
No Photo Available
Hulsea nana little hulsea Asteraceae perennial herb Jul-Aug None None G4 S3 2B.3 SB_CalBG/RSABG Alpine boulder and rock field, Subalpine coniferous forest Gravelly (sometimes), Rocky (sometimes), Volcanic 1720 3355 5645 11010 2001-01-01 Photo of Hulsea nana
©2018 Matt C. Berger
Hulsea vestita ssp. pygmaea pygmy hulsea Asteraceae perennial herb Jun-Oct None None G5T1 S1 1B.3 USFS_S Foot traffic/trampling, Recreational use (non-ORV) Alpine boulder and rock field, Subalpine coniferous forest Granitic, Gravelly 2835 3900 9300 12795 Yes 2001-01-01 Photo of Hulsea vestita ssp. pygmaea
© 2012 Duncan S. Bell
Hymenopappus filifolius var. nanus little cutleaf Asteraceae perennial herb May-Sep None None G5T4 S3 2B.3 Pinyon and juniper woodland, Subalpine coniferous forest Carbonate 1500 3050 4920 10005 2001-01-01 Photo of Hymenopappus filifolius var. nanus
© 2012 Dylan Neubauer
Hymenothrix wrightii Wright's hymenothrix Asteraceae perennial herb Jun-Oct None None G5 S3 4.3 SB_CRES Cismontane woodland, Lower montane coniferous forest, Valley and foothill grassland 1400 1550 4595 5085 2001-01-01
No Photo Available
Hymenoxys lemmonii alkali hymenoxys Asteraceae perennial herb (May)Jun-Aug(Sep) None None G4 S2S3 2B.2 Great Basin scrub, Lower montane coniferous forest, Meadows and seeps (subalkaline) 240 3390 785 11125 2001-01-01 Photo of Hymenoxys lemmonii
© 2006 Steve Matson
Haplodontium tehamense Lassen Peak copper moss Mniaceae moss None None G2 S2 1B.3 Alpine boulder and rock field (mesic, rock, soil, volcanic) 2500 2800 8205 9185 Yes 2001-01-01
No Photo Available
Hosackia gracilis harlequin lotus Fabaceae perennial rhizomatous herb Mar-Jul None None G3G4 S3 4.2 SB_CalBG/RSABG; SB_UCSC Broadleafed upland forest, Cismontane woodland, Closed-cone coniferous forest, Coastal bluff scrub, Coastal prairie, Coastal scrub, Marshes and swamps, Meadows and seeps, North Coast coniferous forest, Valley and foothill grassland Roadsides 0 700 0 2295 2004-01-01 Photo of Hosackia gracilis
© 2015 John Doyen
Hecastocleis shockleyi prickle-leaf Asteraceae perennial evergreen shrub May-Jul None None G4 S4 3 Chenopod scrub, Mojavean desert scrub Carbonate (often), Rocky, Slopes, Washes 1200 2200 3935 7220 1974-01-01 Photo of Hecastocleis shockleyi
© 2013 Aaron Schusteff
Hackelia bella CBR 2006-01-10
No Photo Available
Hackelia mundula CBR 2006-01-10
No Photo Available
Hackelia velutina CBR 2006-01-10
No Photo Available
Haplopappus parishii CBR 2006-01-10
No Photo Available
Haplopappus propinquus CBR 2006-01-10
No Photo Available
Hastingsia bracteosa var. bracteosa CBR 2006-01-10
No Photo Available
Hazardia brickellioides CBR 2006-01-10
No Photo Available
Hemitomes congestum CBR 2006-01-10
No Photo Available
Hesperomecon linearis CBR 2006-01-10
No Photo Available
Heuchera merriamii CBR 2006-01-10
No Photo Available
Haplopappus brickellioides CBR 2006-01-10
No Photo Available
Hackelia longituba CBR 2006-01-10
No Photo Available
Habenaria elegans var. maritima CBR 2006-01-10
No Photo Available
Hemizonia multicaulis ssp. multicaulis CBR 2006-01-10
No Photo Available
Hemizonia multicaulis ssp. vernalis CBR 2006-01-10
No Photo Available
Hollisteria lanata CBR 2006-01-10
No Photo Available
Hesperevax acaulis var. acaulis CBR 2006-01-10
No Photo Available
Hesperevax acaulis var. ambusticola CBR 2006-01-10
No Photo Available
Halodule wrightii CBR 2006-01-10
No Photo Available
Hazardia stenolepis CBR 2006-01-10
No Photo Available
Horkelia clevelandii CBR 2006-01-10
No Photo Available
Horkelia fusca ssp. tenella CBR 2006-01-10
No Photo Available
Horkelia rydbergii CBR 2006-01-10
No Photo Available
Horkeliella congdonis CBR 2006-01-10
No Photo Available
Horkeliella purpurascens CBR 2006-01-10
No Photo Available
Hymenoxys cooperi var. canescens CBR 2006-01-10
No Photo Available
Heuchera chlorantha CBR 2006-01-10
No Photo Available
Hymenopappus filifolius var. eriopodus hairy-podded fine-leaf hymenopappus Asteraceae perennial herb May-Jul None None G5T3 S2S3 2B.3 SB_CalBG/RSABG Pinyon and juniper woodland Carbonate 1600 1700 5250 5580 2006-12-22 Photo of Hymenopappus filifolius var. eriopodus
© 2020 Matt C. Berger
Hedeoma drummondii Drummond's false pennyroyal Lamiaceae perennial herb May-Jul None None G5 S1 2B.2 Great Basin scrub, Pinyon and juniper woodland Carbonate (usually), Gravelly (sometimes), Rocky (sometimes) 1400 1700 4595 5580 2006-12-27 Photo of Hedeoma drummondii
© 2020 Richard Spellenberg
Heuchera parvifolia CBR 2007-06-12
No Photo Available
Hemieva ranunculifolia buttercup-leaf hemieva Saxifragaceae perennial herb Jun-Aug None None G5 S2 2B.2 Meadows and seeps, Upper montane coniferous forest Granitic, Mesic, Rock crevices (often), Rocky 1500 2500 4920 8205 2007-06-29 Photo of Hemieva ranunculifolia
Dana York (2017)
Heterotheca sessiliflora ssp. sessiliflora beach goldenaster Asteraceae perennial herb Mar-Dec None None G4T2T3 S1 1B.1 SB_CalBG/RSABG; SB_CRES Development, Non-native plant impacts, ORV activity, Other Chaparral (coastal), Coastal dunes, Coastal scrub 0 1225 0 4020 2007-06-14
No Photo Available
Hymenoxys odorata bitter hymenoxys Asteraceae annual herb Feb-Nov None None G5 S2 2B.1 Development Riparian scrub, Sonoran desert scrub Sandy 45 150 150 490 2008-11-20 Photo of Hymenoxys odorata
© 2015 Richard Spellenberg
Helianthus inexpectatus Newhall sunflower Asteraceae perennial rhizomatous herb Aug-Oct None None G1 S1 1B.1 SB_CalBG/RSABG Altered flood/tidal/hydrologic regime, Development, Non-native plant impacts, Over-collecting/poaching Marshes and swamps, Riparian woodland Seeps 305 305 1000 1000 Yes 2010-08-16 Photo of Helianthus inexpectatus
© 2012 Anuja Parikh and Nathan Gale
Horkelia daucifolia var. indicta Jepson's horkelia Rosaceae perennial herb Apr-Jun None None G4T1 S1 1B.1 SB_UCSC Development Cismontane woodland Clay, Openings, Vernally Mesic, Volcanic 240 670 785 2200 Yes 2011-09-26 Photo of Horkelia daucifolia var. indicta
© 2011 Dean Wm. Taylor, Ph.D.
Hesperolinon sharsmithiae Sharsmith's western flax Linaceae annual herb May-Jul None None G2Q S2 1B.2 BLM_S; SB_UCSC Agriculture, Dam/Inundation, Development, Grazing, Non-native plant impacts, Other, Recreational use (non-ORV), Wood cutting or brush clearing Chaparral Serpentine 270 300 885 985 Yes 2012-12-14 Photo of Hesperolinon sharsmithiae
© 2017 Aaron Arthur
Hesperolinon spergulinum CBR 2011-11-03
No Photo Available
Hesperocyparis abramsiana var. butanoensis Butano Ridge cypress Cupressaceae perennial evergreen tree Oct FT CE G1T1 S1 1B.2 SB_CalBG/RSABG Improper burning regime, Logging, Mining Chaparral, Closed-cone coniferous forest, Lower montane coniferous forest Sandstone 400 490 1310 1610 Yes 2011-12-19 Photo of Hesperocyparis abramsiana var. butanoensis
© 2011 Joey Malone
Heteranthera dubia water star-grass Pontederiaceae perennial herb (aquatic) Jul-Oct None None G5 S2 2B.2 IUCN_LC Erosion/runoff, Recreational use (non-ORV) Marshes and swamps (alkaline, still, slow-moving water) Alkaline 30 1495 100 4905 2013-10-10 Photo of Heteranthera dubia
©2010 Louis-M. Landry
Hypogymnia schizidiata island tube lichen Parmeliaceae foliose lichen None None G2G3 S2 1B.3 Improper burning regime Chaparral, Closed-cone coniferous forest 360 405 1180 1330 2014-03-01
No Photo Available
Helianthus winteri Winter's sunflower Asteraceae perennial shrub Jan-Dec None None G2? S2? 1B.2 BLM_S; SB_CalBG/RSABG Agriculture, Foot traffic/trampling, Grazing, Non-native plant impacts, Recreational use (non-ORV), Road/trail construction/maint. Cismontane woodland, Valley and foothill grassland Granitic, Openings, Roadsides (often), Rocky (often), Slopes 125 460 410 1510 Yes 2014-10-15 Photo of Helianthus winteri
© 2014 Chris Winchell
Hydrocotyle prolifera CBR 2016-11-04
No Photo Available
Horkelia howellii Howell’s horkelia Rosaceae perennial herb Jun-Aug None None G4 S3 4.3 Chaparral, Lower montane coniferous forest Clay, Serpentine 60 1200 195 3935 2021-04-23 Photo of Horkelia howellii
© 2016 Keir Morse
Hoffmannseggia peninsularis Baja peninsula rushpea Fabaceae perennial shrub Jan-Mar None None G2 S1 1B.1 Sonoran desert scrub Gravelly, Metamorphic (sometimes), Rocky, Volcanic (sometimes) 255 275 835 900 2023-01-20 Photo of Hoffmannseggia peninsularis
© 2019 Joey Malone
Holodiscus discolor var. cedrorum Cedars oceanspray Rosaceae perennial deciduous shrub (Apr)May-Jun(Jul) None None 1B.3 Chaparral (sometimes), Closed-cone coniferous forest Serpentine 170 540 560 1770 2024-04-11 Photo of Holodiscus discolor var. cedrorum
© 2024 Aaron Arthur
Hastingsia atropurpurea CBR 2024-02-29
No Photo Available
Hazardia squarrosa var. squarrosa CBR 2024-02-29
No Photo Available
Heterotheca sessiliflora var. bolanderoides CBR 2024-02-29
No Photo Available
Heterotheca sessiliflora var. camphorata CBR 2024-02-29
No Photo Available
Heterotheca sessiliflora var. fastigiata CBR 2024-02-29
No Photo Available
Heterotheca sessiliflora var. sanjacintensis CBR 2024-02-29
No Photo Available
Heuchera micrantha var. macropetala CBR 2024-02-29
No Photo Available
Heuchera pringlei CBR 2024-02-29
No Photo Available
Holocarpha obconica ssp. autumnalis CBR 2024-02-29
No Photo Available
Heteropogon contortus CBR 2024-03-06
No Photo Available
Horkelia cuneata ssp. cuneata CBR 2024-03-06
No Photo Available
Hygroamblystegium noterophilum CBR 2024-03-06
No Photo Available
Helianthus californicus CBR 2024-03-19
No Photo Available
Hooveria parviflora CBR 2024-03-19
No Photo Available

Suggested Citation:
California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5). Website https://www.rareplants.cnps.org [accessed 24 April 2024].