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122 matches found. Click on scientific name for details

Search Criteria: Common 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
Sisyrinchium hitchcockii Hitchcock's blue-eyed grass Iridaceae perennial rhizomatous herb Jun None None G1G2 S1 1B.1 Cismontane woodland (openings), Valley and foothill grassland 305 305 1000 1000 2004-01-01 Photo of Sisyrinchium hitchcockii
©2009 Dana York
Taraxacum ceratophorum horned dandelion Asteraceae annual herb Jun-Jul(Aug) None None G5 S1 2B.1 Alpine boulder and rock field, Meadows and seeps, Valley and foothill grassland (mesic) Carbonate (sometimes) 2895 3610 9500 11845 2004-01-01
No Photo Available
Calycadenia hooveri Hoover's calycadenia Asteraceae annual herb Jul-Sep None None G2 S2 1B.3 Agriculture, Development, Grazing, Road/trail construction/maint. Cismontane woodland, Valley and foothill grassland Rocky 65 300 215 985 Yes 1980-01-01
No Photo Available
Agrostis hendersonii Henderson's bent grass Poaceae annual herb Apr-Jun None None G2Q S2 3.2 Dam/Inundation, Development, Grazing, Non-native plant impacts, ORV activity, Other, Vandalism/dumping/litter Valley and foothill grassland (mesic), Vernal pools 70 305 230 1000 1974-01-01 Photo of Agrostis hendersonii
©2005 Steve Matson
Agrostis hooveri Hoover's bent grass Poaceae perennial herb Apr-Jul None None G2 S2 1B.2 BLM_S; SB_SBBG; USFS_S Development, Grazing, Mining, Non-native plant impacts, Road/trail construction/maint., Wood cutting or brush clearing Chaparral, Cismontane woodland, Closed-cone coniferous forest, Valley and foothill grassland Sandy (usually) 6 610 20 2000 Yes 1974-01-01 Photo of Agrostis hooveri
2017 Adonis (Don) Tate
Allium hickmanii Hickman's onion Alliaceae perennial bulbiferous herb Mar-May None None G2 S2 1B.2 BLM_S; SB_SBBG; USFS_S Development, Erosion/runoff, Foot traffic/trampling, Grazing, Military operations, Mining, Non-native plant impacts, ORV activity, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter Chaparral (maritime), Closed-cone coniferous forest, Coastal prairie, Coastal scrub, Valley and foothill grassland 5 200 15 655 Yes 1974-01-01 Photo of Allium hickmanii
© 2017 Dylan Neubauer
Arctostaphylos hookeri ssp. hearstiorum Hearsts' manzanita Ericaceae perennial evergreen shrub Feb-Apr None CE G3T2 S2 1B.2 Foot traffic/trampling, Grazing, Hybridization Chaparral (maritime), Coastal prairie, Coastal scrub, Valley and foothill grassland Sandy 55 200 180 655 Yes 1974-01-01 Photo of Arctostaphylos hookeri ssp. hearstiorum
© 2006 Steve Matson
Arctostaphylos hookeri ssp. hookeri Hooker's manzanita Ericaceae perennial evergreen shrub Jan-Jun None None G3T2 S2 1B.2 BLM_S; SB_UCSC Agriculture, Biocides, Development, Erosion/runoff, Foot traffic/trampling, Improper burning regime, Non-native plant impacts, Other, Road/trail construction/maint., Wood cutting or brush clearing Chaparral, Cismontane woodland, Closed-cone coniferous forest, Coastal scrub Sandy 46 536 150 1760 Yes 1984-01-01 Photo of Arctostaphylos hookeri ssp. hookeri
© 2011 Chris Winchell
Arctostaphylos hooveri Hoover's manzanita Ericaceae perennial evergreen shrub Feb-Jun None None G3 S3 4.3 SB_CalBG/RSABG; SB_UCSC; USFS_S Broadleafed upland forest, Chaparral (rocky), Cismontane woodland, Lower montane coniferous forest 480 1035 1575 3395 Yes 1974-01-01 Photo of Arctostaphylos hooveri
© 2005 Dean Wm. Taylor
Deinandra halliana Hall's tarplant Asteraceae annual herb (Mar)Apr-May None None G3 S3 1B.1 BLM_S; SB_CalBG/RSABG; SB_SBBG Agriculture, Development, Erosion/runoff, Foot traffic/trampling, Grazing, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint. Chenopod scrub, Cismontane woodland, Valley and foothill grassland Alkaline (sometimes), Clay 260 950 855 3115 Yes 1974-01-01
No Photo Available
Chloropyron molle ssp. hispidum hispid salty bird's-beak Orobanchaceae annual herb (hemiparasitic) Jun-Sep None None G2T1 S1 1B.1 Agriculture, Altered flood/tidal/hydrologic regime, Dam/Inundation, Development, Disking, Erosion/runoff, Foot traffic/trampling, Grazing, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint. Meadows and seeps, Playas, Valley and foothill grassland Alkaline 1 155 5 510 Yes 1974-01-01
No Photo Available
Boechera hoffmannii Hoffmann's rockcress Brassicaceae perennial herb Feb-Apr FE None G1G2 S1S2 1B.1 SB_CalBG/RSABG; SB_SBBG Erosion/runoff, Grazing, Non-native plant impacts Chaparral, Coastal bluff scrub, Coastal scrub Rocky, Sandy, Volcanic 60 395 195 1295 Yes 1974-01-01
No Photo Available
Ceanothus purpureus holly-leaved ceanothus Rhamnaceae perennial evergreen shrub Feb-Jun None None G2 S2 1B.2 SB_SBBG Agriculture, Development, Road/trail construction/maint., Wood cutting or brush clearing Chaparral, Cismontane woodland Rocky, Volcanic 120 640 395 2100 Yes 1974-01-01 Photo of Ceanothus purpureus
© 2012 Jake Ruygt
Arctostaphylos hispidula Howell's manzanita Ericaceae perennial evergreen shrub Mar-Apr None None G4 S3 4.2 SB_UCSC Chaparral (sandstone, serpentinite) 120 1250 395 4100 1974-01-01 Photo of Arctostaphylos hispidula
© 2006 Steve Matson
Draba howellii Howell's draba Brassicaceae perennial herb Jun-Jul None None G4 S4 4.3 SB_BerrySB Subalpine coniferous forest (rocky) 1370 3000 4495 9845 1974-01-01 Photo of Draba howellii
© 2013 Dana York
Astragalus agnicidus Humboldt County milk-vetch Fabaceae perennial herb (Mar)Apr-Sep None CE G2 S2 1B.1 SB_BerrySB; SB_CalBG/RSABG Biocides, Erosion/runoff, Foot traffic/trampling, Grazing, Logging, Non-native plant impacts, ORV activity, Other, Road/trail construction/maint., Wood cutting or brush clearing Broadleafed upland forest, North Coast coniferous forest Disturbed areas, Openings, Roadsides (sometimes) 120 800 395 2625 Yes 1974-01-01 Photo of Astragalus agnicidus
©2004 Dean Wm. Taylor
Astragalus insularis var. harwoodii Harwood's milk-vetch Fabaceae annual herb Jan-May None None G5T4 S2 2B.2 SB_CalBG/RSABG Development, Erosion/runoff, Grazing, Mining, Non-native plant impacts, ORV activity, Road/trail construction/maint., Vandalism/dumping/litter Desert dunes, Mojavean desert scrub Gravelly (sometimes), Sandy (sometimes) 0 710 0 2330 1980-01-01
No Photo Available
Atriplex cordulata var. cordulata heartscale Chenopodiaceae annual herb Apr-Oct None None G3T2 S2 1B.2 BLM_S Agriculture, Dam/Inundation, Development, Foot traffic/trampling, Grazing, Non-native plant impacts, Road/trail construction/maint., Waterway bank protection/maintenance Chenopod scrub, Meadows and seeps, Valley and foothill grassland (sandy) Alkaline (sometimes) 0 560 0 1835 Yes 1988-01-01 Photo of Atriplex cordulata var. cordulata
© 1994 Robert E. Preston, Ph.D.
Camissoniopsis hardhamiae Hardham's evening-primrose Onagraceae annual herb Mar-May None None G2 S2 1B.2 BLM_S; USFS_S Biocides, Erosion/runoff, Feral pigs, Foot traffic/trampling, Grazing, Improper burning regime, Military operations, Mining, Non-native plant impacts, ORV activity, Other, Road/trail construction/maint. Chaparral, Cismontane woodland Burned areas (sometimes), Carbonate, Disturbed areas (sometimes), Sandy 140 945 460 3100 Yes 1980-01-01
No Photo Available
Lomatium hooveri Hoover's lomatium Apiaceae perennial herb Apr-Jul None None G3 S3 4.3 Chaparral, Cismontane woodland Serpentine, Volcanic (rarely) 300 885 985 2905 Yes 1980-01-01
No Photo Available
Lomatium howellii Howell's lomatium Apiaceae perennial herb Apr-Jul None None G4G5 S4 4.3 Chaparral, Lower montane coniferous forest Serpentine 110 1705 360 5595 1974-01-01 Photo of Lomatium howellii
©2008 Keir Morse
Castilleja montigena Heckard's paintbrush Orobanchaceae perennial herb (hemiparasitic) May-Aug None None G3 S3 4.3 Lower montane coniferous forest, Pinyon and juniper woodland, Upper montane coniferous forest 1950 2800 6400 9185 Yes 1974-01-01
No Photo Available
Ceanothus hearstiorum Hearsts' ceanothus Rhamnaceae perennial evergreen shrub Mar-Apr None CR G1G2 S1S2 1B.2 BLM_S Development, Foot traffic/trampling, Grazing, Improper burning regime, Other Chaparral (maritime), Coastal prairie, Coastal scrub 75 245 245 805 Yes 1974-01-01
No Photo Available
Euphorbia hooveri Hoover's spurge Euphorbiaceae annual herb Jul-Sep(Oct) FT None G1 S1 1B.2 Agriculture, Altered flood/tidal/hydrologic regime, Biocides, Development, Disking, Erosion/runoff, Foot traffic/trampling, Grazing, Non-native plant impacts, Other, Recreational use (non-ORV), Surface water diversion Vernal pools 25 250 80 820 Yes 1974-01-01
No Photo Available
Chorizanthe howellii Howell's spineflower Polygonaceae annual herb May-Jul FE CT G1 S1 1B.2 Development, Erosion/runoff, Foot traffic/trampling, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint. Coastal dunes, Coastal prairie, Coastal scrub Disturbed areas (often), Sandy 0 45 0 150 Yes 1980-01-01
No Photo Available
Cryptantha hooveri Hoover's cryptantha Boraginaceae annual herb Apr-May None None GH SH 1A Agriculture, Development Inland dunes, Valley and foothill grassland (sandy) 9 150 30 490 Yes 1974-01-01
No Photo Available
Delphinium californicum ssp. interius Hospital Canyon larkspur Ranunculaceae perennial herb Apr-Jun None None G3T3 S3 1B.2 BLM_S; SB_CalBG/RSABG Agriculture, Feral pigs, Grazing, Non-native plant impacts, ORV activity, Recreational use (non-ORV), Road/trail construction/maint., Wood cutting or brush clearing Chaparral (openings), Cismontane woodland (mesic), Coastal scrub 195 1095 640 3595 Yes 1984-01-01
No Photo Available
Delphinium hutchinsoniae Hutchinson's larkspur Ranunculaceae perennial herb Mar-Jun None None G2 S2 1B.2 SB_UCSC; USFS_S Biocides, Development, Erosion/runoff, Foot traffic/trampling, Grazing, Improper burning regime, Non-native plant impacts, Other, Over-collecting/poaching, Road/trail construction/maint. Broadleafed upland forest, Chaparral, Coastal prairie, Coastal scrub 0 427 0 1400 Yes 1974-01-01
No Photo Available
Echinocereus engelmannii var. howei Howe's hedgehog cactus Cactaceae perennial stem Apr-May None None G5T1 S1 1B.1 BLM_S Other, Over-collecting/poaching Mojavean desert scrub 430 775 1410 2545 Yes 1980-01-01
No Photo Available
Epilobium septentrionale Humboldt County fuchsia Onagraceae perennial herb Jul-Sep None None G4 S4 4.3 Broadleafed upland forest, North Coast coniferous forest Rocky (sometimes), Sandy (sometimes) 45 1800 150 5905 Yes 1974-01-01 Photo of Epilobium septentrionale
Image by BLM,Arcata Field Office
Erigeron aequifolius Hall's daisy Asteraceae perennial rhizomatous herb Jun-Aug None None G3 S3 1B.3 BLM_S; SB_CalBG/RSABG; USFS_S Road/trail construction/maint. Broadleafed upland forest, Lower montane coniferous forest, Pinyon and juniper woodland, Upper montane coniferous forest Granitic, Rocky 1500 2440 4920 8005 Yes 1974-01-01
No Photo Available
Tetracoccus hallii Hall's tetracoccus Picrodendraceae perennial deciduous shrub Jan-May None None G4 S4 4.3 SB_CalBG/RSABG Mojavean desert scrub, Sonoran desert scrub 30 1200 100 3935 2001-01-01
No Photo Available
Thelypodium howellii ssp. howellii Howell's thelypodium Brassicaceae perennial herb May-Jul None None G1T1 S1 1B.2 BLM_S; SB_UCSC; USFS_S Grazing, Other Great Basin scrub, Meadows and seeps (alkaline) 1200 1830 3935 6005 2001-01-01 Photo of Thelypodium howellii ssp. howellii
©1990 Dean Wm. Taylor
Lewisia cotyledon var. heckneri Heckner's lewisia Montiaceae perennial herb (Apr)May-Jul None None G4T3 S3 1B.2 BLM_S; SB_UCSC Foot traffic/trampling, Logging, Mining, Other, Recreational use (non-ORV), Road/trail construction/maint. Lower montane coniferous forest (rocky) 225 2100 740 6890 Yes 1980-01-01 Photo of Lewisia cotyledon var. heckneri
©2010 Neal Kramer
Lewisia cotyledon var. howellii Howell's lewisia Montiaceae perennial herb Apr-Jul None None G4T4Q S3 3.2 Broadleafed upland forest, Chaparral, Cismontane woodland, Lower montane coniferous forest Rocky 150 2010 490 6595 1980-01-01 Photo of Lewisia cotyledon var. howellii
© 2021 Scot Loring
Laphamia villosa Hanaupah rock daisy Asteraceae perennial herb Jun None None G2 S2 1B.3 Great Basin scrub, Pinyon and juniper woodland Carbonate, Rocky 1700 2600 5580 8530 Yes 1974-01-01
No Photo Available
Sanicula hoffmannii Hoffmann's sanicle Apiaceae perennial herb Mar-May None None G3 S3 4.3 SB_SBBG; SB_UCSC Broadleafed upland forest, Chaparral, Cismontane woodland, Coastal bluff scrub, Coastal scrub, Lower montane coniferous forest Clay (often), Serpentine (often) 30 300 100 985 Yes 1974-01-01
No Photo Available
Phlox dispersa High Sierra phlox Polemoniaceae perennial stoloniferous herb Jul-Aug None None G3 S3 4.3 Alpine boulder and rock field (granitic) 3600 4200 11810 13780 Yes 1974-01-01
No Photo Available
Eriogonum hoffmannii var. hoffmannii Hoffmann's buckwheat Polygonaceae annual herb Jun-Sep None None G3T2 S2 1B.3 BLM_S; SB_CalBG/RSABG Non-native plant impacts, Road/trail construction/maint. Mojavean desert scrub, Pinyon and juniper woodland Rocky 650 1700 2135 5580 Yes 1974-01-01
No Photo Available
Erioneuron pilosum hairy erioneuron Poaceae perennial herb (Apr)May-Jun None None G5 S2 2B.3 SB_CalBG/RSABG Development, Grazing, Mining, Non-native animal impacts, Non-native plant impacts, ORV activity Pinyon and juniper woodland (sometimes carbonate, rocky) 1420 2010 4660 6595 1974-01-01
No Photo Available
Eryngium aristulatum var. hooveri Hoover's button-celery Apiaceae annual/perennial herb (Jun)Jul(Aug) None None G5T1 S1 1B.1 SB_CalBG/RSABG Biocides, Development, Foot traffic/trampling, Grazing, ORV activity, Other, Road/trail construction/maint., Wood cutting or brush clearing Vernal pools 3 45 10 150 Yes 1984-01-01
No Photo Available
Erythronium hendersonii Henderson's fawn lily Liliaceae perennial bulbiferous herb Apr-Jul None None G4 S2 2B.3 USFS_S Erosion/runoff, Road/trail construction/maint. Lower montane coniferous forest 300 1600 985 5250 1974-01-01 Photo of Erythronium hendersonii
© 2021 Scot Loring
Erythronium howellii Howell's fawn lily Liliaceae perennial bulbiferous herb Apr-May None None G3G4 S2 1B.3 Logging, Mining, Road/trail construction/maint. Lower montane coniferous forest, North Coast coniferous forest Serpentine (sometimes) 200 1145 655 3755 1974-01-01 Photo of Erythronium howellii
© 2021 Scot Loring
Fimbristylis thermalis hot springs fimbristylis Cyperaceae perennial rhizomatous herb Jul-Sep None None G4 S1S2 2B.2 SB_CalBG/RSABG Altered flood/tidal/hydrologic regime, Development, Grazing, Groundwater pumping, Non-native plant impacts, ORV activity, Recreational use (non-ORV), Road/trail construction/maint. Meadows and seeps (alkaline, near hot springs) 110 1340 360 4395 1980-01-01
No Photo Available
Galium hardhamiae Hardham's bedstraw Rubiaceae perennial herb Apr-Oct None None G3 S3 1B.3 BLM_S; USFS_S Military operations, ORV activity, Road/trail construction/maint. Chaparral, Closed-cone coniferous forest Serpentine 395 975 1295 3200 Yes 1984-01-01 Photo of Galium hardhamiae
© 1984 California Native Plant Society
Gilia tenuiflora ssp. hoffmannii Hoffmann's slender-flowered gilia Polemoniaceae annual herb Apr-May FE None G3G4T1 S1 1B.1 SB_CalBG/RSABG; SB_SBBG Erosion/runoff, Non-native plant impacts Coastal dunes, Coastal scrub Loam, Openings, Sandy 10 30 35 100 Yes 1974-01-01 Photo of Gilia tenuiflora ssp. hoffmannii
© 2000 John Game
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
Juncus supiniformis hair-leaved rush Juncaceae perennial rhizomatous herb Apr-May(Jun-Jul) None None G5 S1 2B.2 IUCN_LC Development, ORV activity, Other, Recreational use (non-ORV) Bogs and fens, Marshes and swamps (freshwater) 20 100 65 330 1974-01-01 Photo of Juncus supiniformis
© 2013 Asa Spade
Lepechinia cardiophylla heart-leaved pitcher sage Lamiaceae perennial shrub Apr-Jul None None G3 S2S3 1B.2 SB_CalBG/RSABG; SB_CRES; USFS_S Biocides, Development, Logging, Non-native plant impacts, Other, Road/trail construction/maint., Wood cutting or brush clearing Chaparral, Cismontane woodland, Closed-cone coniferous forest 520 1370 1705 4495 1974-01-01 Photo of Lepechinia cardiophylla
© 2003 Vince Scheidt
Listera cordata heart-leaved twayblade Orchidaceae perennial herb Feb-Jul None None G5 S4 4.2 Bogs and fens, Lower montane coniferous forest, North Coast coniferous forest 5 1370 15 4495 1974-01-01 Photo of Listera cordata
©2013 Dr. Amadej Trnkoczy 0000 0000 0513 2468
Lupinus lepidus var. culbertsonii Hockett Meadows lupine Fabaceae perennial herb Jul-Aug None None G5T3 S3 1B.3 USFS_S Meadows and seeps, Upper montane coniferous forest (mesic, rocky) 2440 3000 8005 9845 Yes 1974-01-01
No Photo Available
Lupinus polyphyllus var. humicola Holmgren's lupine Fabaceae perennial herb May-Jun None None G5T4 S2 2B.3 Pinyon and juniper woodland (volcanic) 1500 2500 4920 8205 1974-01-01
No Photo Available
Lupinus lapidicola Heller's Mount Eddy lupine Fabaceae perennial herb Jul None None G4 S4 4.3 Lower montane coniferous forest, Subalpine coniferous forest, Upper montane coniferous forest Granitic, Gravelly, Serpentine 1500 3000 4920 9845 Yes 1974-01-01 Photo of Lupinus lapidicola
©2016 Dana York
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
Malacothamnus hallii Hall's bush-mallow Malvaceae perennial deciduous shrub (Apr)May-Sep(Oct) None None G2 S2 1B.2 BLM_S; SB_CalBG/RSABG Dam/Inundation, Development, Erosion/runoff, Feral pigs, Foot traffic/trampling, Grazing, Improper burning regime, Non-native plant impacts, ORV activity, Other, Road/trail construction/maint. Chaparral, Coastal scrub 10 760 35 2495 Yes 1974-01-01 Photo of Malacothamnus hallii
© 2017 Keir Morse
Malacothamnus helleri Heller's bush-mallow Malvaceae perennial deciduous shrub May-Jul None None G2Q S2 3.3 Chaparral (sandstone), Riparian woodland (gravel) 305 635 1000 2085 Yes 1974-01-01 Photo of Malacothamnus helleri
© 2017 Keir Morse
Mentzelia hirsutissima hairy stickleaf Loasaceae annual herb Mar-May None None G4? S3 2B.3 SB_CalBG/RSABG; SB_USDA Foot traffic/trampling, Grazing, Mining, Non-native plant impacts, ORV activity, Vandalism/dumping/litter Sonoran desert scrub (rocky) 0 700 0 2295 1974-01-01
No Photo Available
Sabulina howellii Howell's sandwort Caryophyllaceae perennial herb Apr-Jul None None G4 S3 1B.3 Foot traffic/trampling, Mining, Other Chaparral, Lower montane coniferous forest Serpentine 550 1000 1805 3280 1980-01-01 Photo of Sabulina howellii
©2015 John Doyen
Monardella macrantha ssp. hallii Hall's monardella Lamiaceae perennial rhizomatous herb Jun-Oct None None G5T3 S3 1B.3 SB_CalBG/RSABG; USFS_S Improper burning regime, Other, Recreational use (non-ORV), Road/trail construction/maint., Wood cutting or brush clearing Broadleafed upland forest, Chaparral, Cismontane woodland, Lower montane coniferous forest, Valley and foothill grassland 730 2195 2395 7200 Yes 1974-01-01
No Photo Available
Navarretia eriocephala hoary navarretia Polemoniaceae annual herb May-Jun None None G4? S4? 4.3 Cismontane woodland, Valley and foothill grassland Vernally Mesic 105 400 345 1310 Yes 1974-01-01 Photo of Navarretia eriocephala
© 2018 Leigh Johnson
Orcuttia pilosa hairy Orcutt grass Poaceae annual herb May-Sep FE CE G1 S1 1B.1 SB_CalBG/RSABG Agriculture, Altered flood/tidal/hydrologic regime, Development, Disking, Erosion/runoff, Foot traffic/trampling, Grazing, Non-native plant impacts, ORV activity, Other, Road/trail construction/maint. Vernal pools 46 200 150 655 Yes 1980-01-01 Photo of Orcuttia pilosa
© 2003 George W. Hartwell
Aphyllon validum ssp. howellii Howell's broomrape Orobanchaceae perennial herb (parasitic) Jun-Sep None None G4T3 S3 4.3 Chaparral (serpentinite, volcanic) 180 1740 590 5710 Yes 1984-01-01
No Photo Available
Castilleja ambigua var. humboldtiensis Humboldt Bay owl's-clover Orobanchaceae annual herb (hemiparasitic) Apr-Aug None None G4T2 S2 1B.2 BLM_S; SB_UCBG Agriculture, Altered flood/tidal/hydrologic regime, Development, Foot traffic/trampling, Grazing, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Surface water diversion, Waterway bank protection/maintenance Marshes and swamps (coastal salt) 0 3 0 10 Yes 1974-01-01 Photo of Castilleja ambigua var. humboldtiensis
©2017 Steve Matson
Pedicularis howellii Howell's lousewort Orobanchaceae perennial herb Jun-Aug None None G4 S3 4.3 USFS_S Upper montane coniferous forest (often serpentinite) 1500 1900 4920 6235 1974-01-01 Photo of Pedicularis howellii
©2015 John Doyen
Potentilla hickmanii Hickman's cinquefoil Rosaceae perennial herb Apr-Aug FE CE G1 S1 1B.1 SB_UCBG Altered flood/tidal/hydrologic regime, Development, Erosion/runoff, Foot traffic/trampling, Non-native plant impacts, Other, Recreational use (non-ORV) Closed-cone coniferous forest, Coastal bluff scrub, Marshes and swamps (freshwater), Meadows and seeps (vernally mesic) 10 149 35 490 Yes 1974-01-01
No Photo Available
Pseudobahia bahiifolia Hartweg's golden sunburst Asteraceae annual herb Mar-Apr FE CE G1 S1 1B.1 SB_CalBG/RSABG Agriculture, Development, Erosion/runoff, Foot traffic/trampling, Grazing, Mining, Non-native plant impacts, ORV activity, Other, Road/trail construction/maint., Vandalism/dumping/litter Cismontane woodland, Valley and foothill grassland Acidic (often), Clay 15 150 50 490 Yes 1974-01-01
No Photo Available
Plagiobothrys uncinatus hooked popcornflower Boraginaceae annual herb Apr-May None None G2 S2 1B.2 USFS_S Feral pigs, Grazing, Improper burning regime, Military operations, Non-native plant impacts, ORV activity, Recreational use (non-ORV), Road/trail construction/maint. Chaparral (sandy), Cismontane woodland, Valley and foothill grassland 300 760 985 2495 Yes 1974-01-01
No Photo Available
Boechera hirshbergiae Hirshberg's rockcress Brassicaceae perennial herb Mar-May None None G1Q S1 1B.2 SB_CRES Grazing Pebble (Pavement) plain 1400 1415 4595 4645 Yes 2001-01-01
No Photo Available
Lewisia kelloggii ssp. hutchisonii Hutchison's lewisia Montiaceae perennial herb (Apr)May-Aug None None G3G4T3Q S3 3.2 USFS_S Upper montane coniferous forest Openings 765 2365 2510 7760 Yes 2001-01-01 Photo of Lewisia kelloggii ssp. hutchisonii
Dean Wm. Taylor 2006
Lilium humboldtii ssp. humboldtii Humboldt lily Liliaceae perennial bulbiferous herb May-Jul(Aug) None None G4T3 S3 4.2 SB_UCSC Chaparral, Cismontane woodland, Lower montane coniferous forest Openings 90 1280 295 4200 Yes 1994-01-01 Photo of Lilium humboldtii ssp. humboldtii
© 2008 Sierra Pacific Industries
Triteleia hendersonii Henderson's triteleia Themidaceae perennial bulbiferous herb May-Jul None None G4 S1 2B.2 Cismontane woodland 760 1200 2495 3935 1994-01-01 Photo of Triteleia hendersonii
©2016 Keir Morse
Ribes roezlii var. amictum hoary gooseberry Grossulariaceae perennial deciduous shrub Mar-Apr None None G5T4 S4 4.3 Broadleafed upland forest, Cismontane woodland, Lower montane coniferous forest, Upper montane coniferous forest 120 2300 395 7545 Yes 2001-01-01 Photo of Ribes roezlii var. amictum
©1973 Dean Wm. Taylor
Pinguicula macroceras horned butterwort Lentibulariaceae perennial herb (carnivorous) Apr-Jun None None G4 S2 2B.2 IUCN_LC; SB_CalBG/RSABG; SB_UCSC Erosion/runoff, Foot traffic/trampling, Mining, Recreational use (non-ORV), Road/trail construction/maint. Bogs and fens (serpentinite) 40 1920 130 6300 1974-01-01 Photo of Pinguicula macroceras
©2009 Barry Rice
Plagiobothrys glaber hairless popcornflower Boraginaceae annual herb Mar-May None None GX SX 1A Agriculture, Development Marshes and swamps (coastal salt), Meadows and seeps (alkaline) 15 180 50 590 Yes 1974-01-01
No Photo Available
Ribes amarum var. hoffmannii Hoffmann's bitter gooseberry Grossulariaceae perennial deciduous shrub Mar-Apr None None G4?T3 S3 3 Chaparral, Riparian woodland 5 1190 15 3905 Yes 1984-01-01
No Photo Available
Micranthes howellii Howell's saxifrage Saxifragaceae perennial rhizomatous herb Mar-May None None G4 S3 4.3 Cismontane woodland (sometimes serpentinite) 75 900 245 2955 1974-01-01 Photo of Micranthes howellii
© 2007 Jenn Tiehm
Scutellaria holmgreniorum Holmgren's skullcap Lamiaceae perennial rhizomatous herb May-Jul None None G3Q S3 3.3 Grazing Great Basin scrub, Pinyon and juniper woodland Clay, Volcanic 1310 1735 4300 5695 1984-01-01
No Photo Available
Sedum laxum ssp. heckneri Heckner's stonecrop Crassulaceae perennial herb Jun-Jul None None G5?T4 S4 4.3 Lower montane coniferous forest, Upper montane coniferous forest Gabbroic (sometimes), Serpentine (sometimes) 100 2100 330 6890 1980-01-01 Photo of Sedum laxum ssp. heckneri
© 2010 Susan Erwin
Sidalcea hickmanii ssp. hickmanii Hickman's checkerbloom Malvaceae perennial herb May-Jul None None G3T2 S2 1B.3 SB_SBBG; USFS_S Feral pigs, Foot traffic/trampling, Grazing, Military operations, Non-native plant impacts, Other, Road/trail construction/maint., Wood cutting or brush clearing Chaparral (openings), Cismontane woodland, Coastal bluff scrub 335 1220 1100 4005 Yes 1974-01-01
No Photo Available
Streptanthus glandulosus ssp. hoffmanii Hoffman's bristly jewelflower Brassicaceae annual herb Mar-Jul None None G4T2 S2 1B.3 SB_UCSC Erosion/runoff, Logging, Road/trail construction/maint. Chaparral, Cismontane woodland, Valley and foothill grassland (often serpentinite) Rocky 120 475 395 1560 Yes 1980-01-01
No Photo Available
Streptanthus howellii Howell's jewelflower Brassicaceae perennial herb Jul-Aug None None G2G3 S2 1B.2 USFS_S Improper burning regime, Mining, Other, Road/trail construction/maint., Wood cutting or brush clearing Lower montane coniferous forest (rocky, serpentinite) 305 1500 1000 4920 1980-01-01 Photo of Streptanthus howellii
©Rick York and CNPS
Tauschia howellii Howell's tauschia Apiaceae perennial herb Jun-Aug None None G2G3 S2S3 1B.3 SB_SBBG; USFS_S Foot traffic/trampling, Logging, ORV activity, Other, Recreational use (non-ORV) Subalpine coniferous forest, Upper montane coniferous forest Granitic, Gravelly 1705 2500 5595 8205 1974-01-01 Photo of Tauschia howellii
©2011 Dean Wm. Taylor
Tetracoccus ilicifolius holly-leaved tetracoccus Picrodendraceae perennial deciduous shrub May-Jun None None G2 S2 1B.3 SB_CalBG/RSABG Mojavean desert scrub (carbonate, rocky) 600 1830 1970 6005 Yes 1974-01-01
No Photo Available
Trichostema austromontanum ssp. compactum Hidden Lake bluecurls Lamiaceae annual herb Jul-Sep FD None G3G4T1 S1 1B.1 SB_CalBG/RSABG Foot traffic/trampling, Other, Recreational use (non-ORV) Upper montane coniferous forest (seasonally submerged lake margins) 2400 2680 7875 8795 Yes 1974-01-01 Photo of Trichostema austromontanum ssp. compactum
© 2013 Keir Morse
Trichostema rubisepalum Hernandez bluecurls Lamiaceae annual herb Jun-Aug None None G4 S4 4.3 SB_CalBG/RSABG Broadleafed upland forest, Chaparral, Cismontane woodland, Lower montane coniferous forest, Vernal pools Gravelly, Serpentine (sometimes), Volcanic (sometimes) 300 1435 985 4710 Yes 1974-01-01
No Photo Available
Trifolium howellii Howell's clover Fabaceae perennial herb Jun-Aug None None G4 S4 4.3 Lower montane coniferous forest, Meadows and seeps, Upper montane coniferous forest Mesic 800 1800 2625 5905 1974-01-01 Photo of Trifolium howellii
© 2021 Scot Loring
Wyethia elata Hall's wyethia Asteraceae perennial herb May-Aug None None G4 S4 4.3 Cismontane woodland, Lower montane coniferous forest 1000 1400 3280 4595 Yes 1974-01-01
No Photo Available
Wyethia longicaulis Humboldt County wyethia Asteraceae perennial herb May-Jul None None G4 S4 4.3 Broadleafed upland forest, Coastal prairie, Lower montane coniferous forest Roadsides (sometimes) 750 1525 2460 5005 Yes 1980-01-01 Photo of Wyethia longicaulis
©2004 Dean Wm. Taylor
Acanthomintha obovata ssp. cordata heart-leaved thorn-mint Lamiaceae annual herb Apr-Jul None None G4T3 S3 4.2 SB_CalBG/RSABG; SB_SBBG Chaparral (openings), Cismontane woodland, Pinyon and juniper woodland, Valley and foothill grassland Clay 785 1540 2575 5055 Yes 1994-01-01 Photo of Acanthomintha obovata ssp. cordata
© 2017 Aaron Schusteff
Arnica fulgens hillside arnica Asteraceae perennial rhizomatous herb May-Jul(Aug) None None G5 S3 2B.2 Foot traffic/trampling, Grazing, Logging, Non-native plant impacts, ORV activity, Other, Road/trail construction/maint., Wood cutting or brush clearing Great Basin scrub, Lower montane coniferous forest, Meadows and seeps Mesic 1495 2700 4905 8860 1994-01-01
No Photo Available
Chorizanthe biloba var. immemora Hernandez spineflower Polygonaceae annual herb May-Aug(Sep) None None G3T1T2 S1S2 1B.2 BLM_S Chaparral, Cismontane woodland Clay (sometimes), Gravelly (often), Serpentine (usually) 425 1115 1395 3660 Yes 1994-01-01
No Photo Available
Erigeron inornatus var. calidipetris hot rock daisy Asteraceae perennial herb Jun-Sep None None G5T3 S3 4.3 Lower montane coniferous forest (sandy, volcanic) 1100 1935 3610 6350 Yes 1994-01-01 Photo of Erigeron inornatus var. calidipetris
©2006 Dean Wm. Taylor
Fritillaria biflora var. ineziana Hillsborough chocolate lily Liliaceae perennial bulbiferous herb Mar-Apr None None G3G4T1 S1 1B.1 SB_CalBG/RSABG; SB_UCBG; SB_USDA Other Cismontane woodland, Valley and foothill grassland Serpentine 150 150 490 490 Yes 1994-01-01 Photo of Fritillaria biflora var. ineziana
© 2012 Toni Corelli
Lepidium latipes var. heckardii Heckard's pepper-grass Brassicaceae annual herb Mar-May None None G4T1 S1 1B.2 Development, Disking, Foot traffic/trampling, Grazing Valley and foothill grassland (alkaline flats) 2 200 5 655 Yes 1994-01-01 Photo of Lepidium latipes var. heckardii
2018 Jennifer Buck
Lomatium hendersonii Henderson's lomatium Apiaceae perennial herb Mar-Jun None None G5? S2 2B.3 Other, Road/trail construction/maint. Great Basin scrub, Lower montane coniferous forest, Pinyon and juniper woodland Clay, Rocky 1400 2440 4595 8005 1994-01-01 Photo of Lomatium hendersonii
©2007 Norman Jensen
Montia howellii Howell's montia Montiaceae annual herb (Feb)Mar-May None None G3G4 S2 2B.2 Altered flood/tidal/hydrologic regime, Biocides, Erosion/runoff, Foot traffic/trampling, Grazing, Logging, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Surface water diversion, Vandalism/dumping/litter, Wood cutting or brush clearing Meadows and seeps, North Coast coniferous forest, Vernal pools Roadsides (sometimes), Vernally Mesic 0 835 0 2740 1994-01-01 Photo of Montia howellii
© 2004 Dean Wm. Taylor
Puccinellia howellii Howell's alkali grass Poaceae perennial herb Apr-Jun None None G1 S1 1B.1 SB_BerrySB Altered flood/tidal/hydrologic regime, Foot traffic/trampling, Mining, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter Meadows and seeps (mineralized) 490 490 1610 1610 Yes 1994-01-01 Photo of Puccinellia howellii
©1991 Dean Wm. Taylor
Rupertia hallii Hall's rupertia Fabaceae perennial herb Jun-Aug(Sep) None None G2G3 S2S3 1B.2 BLM_S; USFS_S Improper burning regime, Logging, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter Cismontane woodland, Lower montane coniferous forest Openings (sometimes), Roadsides (often) 545 2250 1790 7380 Yes 1994-01-01
No Photo Available
Atriplex argentea var. hillmanii Hillman's silverscale Chenopodiaceae annual herb Jun-Sep None None G5T4 S2 2B.2 Great Basin scrub, Meadows and seeps Alkaline 1200 1700 3935 5580 2001-01-01
No Photo Available
Cleomella hillmanii var. hillmanii Hillman's cleomella Cleomaceae annual herb Apr-Jun None None G4G5T4T5 S2 2B.2 Other Chenopod scrub, Great Basin scrub Clay 1220 1220 4005 4005 2001-01-01
No Photo Available
Eriogonum collinum hill buckwheat Polygonaceae annual herb Jun-Sep None None G4 S3 4.3 Great Basin scrub, Pinyon and juniper woodland Clay 1300 1800 4265 5905 2001-01-01
No Photo Available
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
Plagiobothrys chorisianus var. hickmanii Hickman's popcornflower Boraginaceae annual herb Apr-Jun None None G3T3Q S3 4.2 SB_SBBG; SB_UCSC Chaparral, Closed-cone coniferous forest, Coastal scrub, Marshes and swamps, Vernal pools 15 390 50 1280 Yes 2001-01-01
No Photo Available
Sibaropsis hammittii Hammitt's clay-cress Brassicaceae annual herb Mar-Apr None None G2 S2 1B.2 SB_CalBG/RSABG; USFS_S Foot traffic/trampling Chaparral (openings), Valley and foothill grassland Clay 720 1065 2360 3495 Yes 2001-01-01
No Photo Available
Stachys pilosa hairy marsh hedge-nettle Lamiaceae perennial rhizomatous herb Jun-Aug None None G5 S3 2B.3 Non-native plant impacts, Other, Road/trail construction/maint. Great Basin scrub (mesic), Meadows and seeps 1200 1770 3935 5805 2001-01-01 Photo of Stachys pilosa
Keir Morse
Eriastrum hooveri Hoover's eriastrum Polemoniaceae annual herb Mar-Jul FD None G3 S3 4.2 SB_CalBG/RSABG Agriculture, Altered flood/tidal/hydrologic regime, Development, Foot traffic/trampling, Grazing, Mining, ORV activity, Pollution, Vandalism/dumping/litter Chenopod scrub, Pinyon and juniper woodland, Valley and foothill grassland Gravelly (sometimes) 50 915 165 3000 Yes 1974-01-01 Photo of Eriastrum hooveri
© 2011 Chris Winchell
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
Astragalus hornii var. hornii Horn's milk-vetch Fabaceae annual herb May-Oct None None GUT1 S1 1B.1 BLM_S Agriculture, Development, Other Meadows and seeps, Playas Alkaline, Lake Margins 60 850 195 2790 2006-12-01
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
Phacelia hubbyi Hubby's phacelia Hydrophyllaceae annual herb Apr-Jul None None G4 S4 4.2 SB_SBBG Chaparral, Coastal scrub, Valley and foothill grassland Gravelly, Rocky, Talus 0 1000 0 3280 Yes 2007-02-02
No Photo Available
Eriastrum harwoodii Harwood's eriastrum Polemoniaceae annual herb Mar-Jun None None G2 S2 1B.2 BLM_S; SB_CalBG/RSABG; SB_USDA Development, Erosion/runoff, Foot traffic/trampling, Grazing, Non-native plant impacts, ORV activity, Other, Vandalism/dumping/litter Desert dunes 125 915 410 3000 Yes 2008-07-22
No Photo Available
Viola howellii Howell's violet Violaceae perennial herb May-Jun None None G4 S1 2B.2 Foot traffic/trampling, Logging, Other North Coast coniferous forest 655 655 2150 2150 2010-03-01 Photo of Viola howellii
© 2021 Scot Loring
Berberis higginsiae Higgin's barberry Berberidaceae perennial shrub Mar-Apr None None G3Q S1 3.2 Development, Other Chaparral, Sonoran desert scrub Granitic (sometimes), Rocky 800 1065 2625 3495 2014-04-30
No Photo Available
Boechera evadens hidden rockcress Brassicaceae perennial herb May-Aug None None G1 S1 1B.3 USFS_S Upper montane coniferous forest Rocky 2560 2850 8400 9350 Yes 2012-04-11
No Photo Available
Coscinodon arctolimnius ssp. higuchii Higuchi's sieve-tooth moss Grimmiaceae moss None None GUTU S1S3 4.2 Alpine boulder and rock field Dry (usually), Rocky 2935 2935 9630 9630 2014-05-13
No Photo Available
Nardia hiroshii Hiroshi's flapwort Jungermanniaceae liverwort None None G4G5 S1 2B.3 Meadows and seeps Granitic 2195 2195 7200 7200 2014-06-02
No Photo Available
Lewinskya holzingeri Holzinger's bristle moss Orthotrichaceae moss None None G3G4 S2 1B.3 Cismontane woodland, Lower montane coniferous forest, Pinyon and juniper woodland, Upper montane coniferous forest 715 1800 2345 5905 2014-06-03 Photo of Lewinskya holzingeri
© 2021 Scot Loring
Spermolepis infernensis Hellhole scaleseed Apiaceae annual herb Mar-Apr None None G1 S1 1B.2 SB_CalBG/RSABG Sonoran desert scrub Rocky (sometimes), Sandy (sometimes) 230 670 755 2200 Yes 2016-01-21
No Photo Available
Allium howellii var. howellii Howell's onion Alliaceae perennial bulbiferous herb Mar-Apr None None G3G4T3 S3 4.3 Valley and foothill grassland Clay (sometimes), Serpentine (sometimes) 50 2200 165 7220 Yes 2017-04-04 Photo of Allium howellii var. howellii
© 2013 Neal Kramer
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
Silene hookeri Hooker's catchfly Caryophyllaceae perennial herb (Mar)May-Jul None None G4 S2 2B.2 Other, Wood cutting or brush clearing Chaparral, Cismontane woodland, Lower montane coniferous forest Openings (often), Rocky (sometimes), Serpentine (sometimes), Slopes (sometimes) 150 1260 490 4135 2021-07-30 Photo of Silene hookeri
©2014 John Doyen
Castilleja ambigua var. heckardii Heckard's owl's-clover Orobanchaceae annual herb May-Jul None None G5T1 S1 1B.1 Coastal prairie Openings, Sandy, Vernally Mesic 50 180 165 590 2022-04-07 Photo of Castilleja ambigua var. heckardii
© 2006 Dave Hacker