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CNPS Rare Plant Inventory


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59 matches found. Click on scientific name for details

Search Criteria: Scientific Name starts with O

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
Oreocarya crymophila subalpine cryptantha Boraginaceae perennial herb Jul-Aug None None G3 S3 1B.3 Other Subalpine coniferous forest (rocky, volcanic) 2600 3200 8530 10500 Yes 1974-01-01
No Photo Available
Oreocarya roosiorum bristlecone cryptantha Boraginaceae perennial herb Jun-Jul None CR G2 S2 1B.2 BLM_S; SB_CalBG/RSABG; USFS_S ORV activity Subalpine coniferous forest (carbonate, rocky) 2440 3230 8005 10600 Yes 1974-01-01
No Photo Available
Oreocarya tumulosa New York Mountains oreocarya Boraginaceae perennial herb Apr-Jun None None G4 S4 4.3 SB_CalBG/RSABG Mojavean desert scrub, Pinyon and juniper woodland Carbonate (sometimes), Clay (sometimes), Granitic (sometimes), Gravelly (sometimes) 915 2130 3000 6990 1980-01-01
No Photo Available
Oenothera avita ssp. eurekensis Eureka Dunes evening-primrose Onagraceae perennial rhizomatous herb Apr-Jun(Jul) FD CR G4?T2 S2 1B.2 SB_CalBG/RSABG Non-native plant impacts, ORV activity Desert dunes 850 1200 2790 3935 Yes 1974-01-01 Photo of Oenothera avita ssp. eurekensis
© Rick York and CNPS
Oenothera cespitosa ssp. crinita caespitose evening-primrose Onagraceae perennial rhizomatous herb (Apr)Jun-Sep None None G5T4 S4? 4.2 Pinyon and juniper woodland, Sonoran desert scrub, Subalpine coniferous forest 1150 3370 3775 11055 1974-01-01
No Photo Available
Oenothera deltoides ssp. howellii Antioch Dunes evening-primrose Onagraceae perennial herb Mar-Sep FE CE G5T1 S1 1B.1 SB_CalBG/RSABG; SB_UCBG Biocides, Development, Foot traffic/trampling, Mining, Non-native plant impacts, Other, Recreational use (non-ORV) Inland dunes 0 30 0 100 Yes 1974-01-01
No Photo Available
Oenothera wolfii Wolf's evening-primrose Onagraceae perennial herb May-Oct None None G2 S1 1B.1 SB_BerrySB Altered flood/tidal/hydrologic regime, Biocides, Development, Erosion/runoff, Foot traffic/trampling, Hybridization, Landfill, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter, Wood cutting or brush clearing Coastal bluff scrub, Coastal dunes, Coastal prairie, Lower montane coniferous forest Mesic (usually), Sandy 3 800 10 2625 1980-01-01 Photo of Oenothera wolfii
©2017 Dana York
Ophioglossum californicum California adder's-tongue Ophioglossaceae perennial rhizomatous herb Jan-Jun(Dec) None None G4 S4 4.2 Chaparral, Valley and foothill grassland, Vernal pools (margins) Mesic 60 525 195 1725 1974-01-01
No Photo Available
Ophioglossum pusillum northern adder's-tongue Ophioglossaceae perennial rhizomatous herb Jul None None G4 S1 2B.2 USFS_S Grazing, Improper burning regime, Other Marshes and swamps (margins), Meadows and seeps 1000 2000 3280 6560 1974-01-01 Photo of Ophioglossum pusillum
© 2021 Scot Loring
Opuntia basilaris var. brachyclada short-joint beavertail Cactaceae perennial stem Apr-Jun(Aug) None None G5T3 S3 1B.2 BLM_S; SB_CalBG/RSABG; USFS_S Development, Erosion/runoff, Foot traffic/trampling, Grazing, Improper burning regime, Logging, Mining, Non-native plant impacts, ORV activity, Other, Over-collecting/poaching, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter, Wood cutting or brush clearing Chaparral, Joshua tree "woodland", Mojavean desert scrub, Pinyon and juniper woodland 425 1800 1395 5905 Yes 1980-01-01
No Photo Available
Opuntia basilaris var. treleasei Bakersfield cactus Cactaceae perennial stem Apr-May FE CE G5T1 S1 1B.1 SB_CalBG/RSABG Agriculture, Altered flood/tidal/hydrologic regime, Biocides, Development, Disking, Erosion/runoff, Foot traffic/trampling, Grazing, Improper burning regime, Landfill, Mining, Non-native plant impacts, ORV activity, Other, Pollution, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter, Waterway bank protection/maintenance Chenopod scrub, Cismontane woodland, Valley and foothill grassland Gravelly (sometimes), Sandy (sometimes) 100 1450 330 4755 Yes 1974-01-01
No Photo Available
Opuntia wigginsii Wiggins' cholla Cactaceae perennial stem Mar None None G3?Q S1? 3.3 Road/trail construction/maint. Sonoran desert scrub (sandy) 30 885 100 2905 1974-01-01
No Photo Available
Orcuttia californica California Orcutt grass Poaceae annual herb Apr-Aug FE CE G1 S1 1B.1 SB_CalBG/RSABG; SB_CRES Agriculture, Altered flood/tidal/hydrologic regime, Dam/Inundation, Development, Disking, Foot traffic/trampling, Grazing, Improper burning regime, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint. Vernal pools 15 660 50 2165 1974-01-01
No Photo Available
Orcuttia inaequalis San Joaquin Valley Orcutt grass Poaceae annual herb Apr-Sep FT CE G1 S1 1B.1 Agriculture, Altered flood/tidal/hydrologic regime, Dam/Inundation, Development, Disking, Erosion/runoff, Foot traffic/trampling, Grazing, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Vandalism/dumping/litter Vernal pools 10 755 35 2475 Yes 1974-01-01
No Photo Available
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
Orcuttia tenuis slender Orcutt grass Poaceae annual herb May-Sep(Oct) FT CE G2 S2 1B.1 SB_UCBG Altered flood/tidal/hydrologic regime, Biocides, Development, Feral pigs, Foot traffic/trampling, Grazing, Improper burning regime, Logging, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint., Surface water diversion Vernal pools Gravelly (often) 35 1760 115 5775 Yes 1974-01-01 Photo of Orcuttia tenuis
© 2013 Justy Leppert
Orcuttia viscida Sacramento Orcutt grass Poaceae annual herb Apr-Jul(Sep) FE CE G1 S1 1B.1 SB_CalBG/RSABG Altered flood/tidal/hydrologic regime, Development, Erosion/runoff, Foot traffic/trampling, Grazing, Insufficient population/stand size, Landfill, Non-native plant impacts, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint. Vernal pools 30 100 100 330 Yes 1974-01-01 Photo of Orcuttia viscida
© Rick York and CNPS
Oreonana purpurascens purple mountain-parsley Apiaceae perennial herb May-Jun None None G3 S3 1B.2 SB_CalBG/RSABG; USFS_S Foot traffic/trampling, Grazing, Logging, Mining, Other, Pollution, Recreational use (non-ORV), Road/trail construction/maint. Broadleafed upland forest, Subalpine coniferous forest, Upper montane coniferous forest Metamorphic (usually) 2395 2865 7860 9400 Yes 1980-01-01
No Photo Available
Oreonana vestita woolly mountain-parsley Apiaceae perennial herb Mar-Sep None None G3 S3 1B.3 BLM_S; SB_CalBG/RSABG; USFS_S Development, Erosion/runoff, Foot traffic/trampling, Over-collecting/poaching, Recreational use (non-ORV), Road/trail construction/maint. Lower montane coniferous forest, Subalpine coniferous forest, Upper montane coniferous forest Gravelly (sometimes), Talus (sometimes) 1615 3500 5300 11485 Yes 1974-01-01
No Photo Available
Ornithostaphylos oppositifolia Baja California birdbush Ericaceae perennial evergreen shrub Jan-Apr None CE G3 S1 2B.1 SB_CalBG/RSABG Improper burning regime, Other, Road/trail construction/maint., Vandalism/dumping/litter Chaparral 55 800 180 2625 1980-01-01
No Photo Available
Orthocarpus cuspidatus ssp. cuspidatus Siskiyou Mountains orthocarpus Orobanchaceae annual herb Jun-Aug None None G5T3 S3 4.3 Lower montane coniferous forest, Upper montane coniferous forest 700 2200 2295 7220 1974-01-01 Photo of Orthocarpus cuspidatus ssp. cuspidatus
©2003 Norman Jensen
Orthocarpus pachystachyus Shasta orthocarpus Orobanchaceae annual herb May None None G1 S1 1B.1 Development Great Basin scrub, Meadows and seeps, Valley and foothill grassland 840 850 2755 2790 Yes 1974-01-01 Photo of Orthocarpus pachystachyus
©2022 Julie Kierstead
Oryctes nevadensis Nevada oryctes Solanaceae annual herb Apr-Jun None None G3 S2 2B.1 Development, Foot traffic/trampling, Grazing, ORV activity, Other, Recreational use (non-ORV), Road/trail construction/maint. Chenopod scrub, Mojavean desert scrub Sandy 1100 2535 3610 8315 1974-01-01
No Photo Available
Oxytheca watsonii Watson's oxytheca Polygonaceae annual herb May-Jul None None G3? S1 2B.2 Grazing, ORV activity, Recreational use (non-ORV) Joshua tree "woodland", Mojavean desert scrub Sandy 1200 2000 3935 6560 1980-01-01
No Photo Available
Oxytropis deflexa var. sericea blue pendent-pod oxytrope Fabaceae perennial herb Jun-Aug None None G5T5 S1 2B.1 SB_CalBG/RSABG Grazing, Other Meadows and seeps, Upper montane coniferous forest 2800 3355 9185 11010 1988-01-01
No Photo Available
Opuntia xcurvispina curved-spine beavertail Cactaceae perennial stem Apr-Jun None None G2G3 S1 2B.2 Chaparral, Mojavean desert scrub, Pinyon and juniper woodland 1000 1400 3280 4595 1994-01-01
No Photo Available
Opuntia fragilis brittle prickly-pear Cactaceae perennial stem Apr-Jul None None G5 S1 2B.1 IUCN_LC Grazing, Recreational use (non-ORV) Pinyon and juniper woodland (volcanic) 820 880 2690 2885 1994-01-01 Photo of Opuntia fragilis
©2008 John Dittes
Oreostemma elatum tall alpine-aster Asteraceae perennial herb Jun-Aug None None G2 S2 1B.2 SB_UCSC; USFS_S Altered flood/tidal/hydrologic regime, Foot traffic/trampling, Grazing, Logging, Non-native plant impacts, Road/trail construction/maint., Wood cutting or brush clearing Bogs and fens, Meadows and seeps, Upper montane coniferous forest Mesic 1005 2100 3295 6890 Yes 2001-01-01
No Photo Available
Orobanche ludoviciana var. arenosa CBR Great Basin scrub
No Photo Available
Osmorhiza depauperata blunt-fruited sweet-cicely Apiaceae perennial herb May-Jul None None G5 S1 2B.3 Lower montane coniferous forest 1830 1850 6005 6070 2001-01-01 Photo of Osmorhiza depauperata
©2019 John Doyen
Oxalis suksdorfii Suksdorf's wood-sorrel Oxalidaceae perennial rhizomatous herb May-Aug None None G4 S3 4.3 Broadleafed upland forest, North Coast coniferous forest 15 700 50 2295 2001-01-01 Photo of Oxalis suksdorfii
©2021 Scot Loring
Oxytropis oreophila var. oreophila rock-loving oxytrope Fabaceae perennial herb Jun-Sep None None G5T4T5 S2 2B.3 SB_CalBG/RSABG; USFS_S Foot traffic/trampling, Recreational use (non-ORV) Alpine boulder and rock field, Subalpine coniferous forest Gravelly (sometimes), Rocky (sometimes) 3400 3800 11155 12470 2001-01-01
No Photo Available
Oxytropis parryi Parry's oxytrope Fabaceae perennial herb Jun-Jul None None G5 S4 4.3 Alpine boulder and rock field, Subalpine coniferous forest (rocky) 3355 3800 11010 12470 2001-01-01
No Photo Available
Orthotrichum shevockii CBR 2001-01-01
No Photo Available
Oreostemma peirsonii CBR 2006-01-10
No Photo Available
Oenothera xylocarpa CBR 2006-01-10
No Photo Available
Opuntia bigelovii var. hoffmannii CBR 2006-01-10
No Photo Available
Opuntia phaeacantha var. major CBR 2006-01-10
No Photo Available
Opuntia phaeacantha var. mojavensis CBR 2006-01-10
No Photo Available
Oreonana clementis CBR 2006-01-10
No Photo Available
Orochaenactis thysanocarpha CBR 2006-01-10
No Photo Available
Orthocarpus purpurascens var. pallidus CBR 2006-01-10
No Photo Available
Oryzopsis kingii CBR 2006-01-10
No Photo Available
Oxystylis lutea CBR 2006-01-10
No Photo Available
Oenothera heterochroma CBR 2006-01-10
No Photo Available
Opuntia prolifera CBR 2006-01-10
No Photo Available
Orobanche californica ssp. condensa CBR 2006-01-10
No Photo Available
Osmadenia tenella CBR 2006-01-10
No Photo Available
Oenothera longissima long-stem evening-primrose Onagraceae annual/perennial herb Jul-Sep None None G4 S1 2B.2 Mojavean desert scrub, Pinyon and juniper woodland Mesic (sometimes) 1000 1700 3280 5580 2006-12-27
No Photo Available
Orthotrichum kellmanii Kellman's bristle moss Orthotrichaceae moss Jan-Feb None None G1 S1 1B.2 USFS_S Chaparral, Cismontane woodland Carbonate, Sandstone 343 685 1125 2245 Yes 2007-08-16
No Photo Available
Oenothera cavernae cave evening-primrose Onagraceae annual herb Mar-Nov None None G2G3 S1 2B.1 SB_CalBG/RSABG Development, Grazing, Mining Great Basin scrub, Joshua tree "woodland", Mojavean desert scrub Gravelly 760 1280 2495 4200 2008-08-12 Photo of Oenothera cavernae
© 2008 James M Andre
Oreocarya glomerata cocks-comb cat's-eye Boraginaceae perennial herb Jul-Aug None None G5 S1 2B.3 Erosion/runoff, Foot traffic/trampling, Recreational use (non-ORV) Pinyon and juniper woodland 1555 2160 5100 7085 2009-08-03 Photo of Oreocarya glomerata
©2016 Keir Morse
Oreocarya schoolcraftii Schoolcraft's cryptantha Boraginaceae perennial herb Jun-Jul None None G3 S1 2B.2 Great Basin scrub 1615 1705 5300 5595 2009-12-22
No Photo Available
Orthodontium gracile CBR 2014-02-11
No Photo Available
Oxytropis oreophila var. juniperina mountain oxytrope Fabaceae perennial herb Jun None None G5T4T5 S1 2B.1 Foot traffic/trampling, Non-native animal impacts, Non-native plant impacts, ORV activity Pinyon and juniper woodland 2150 2150 7055 7055 2020-06-12
No Photo Available
Orthocarpus bracteosus rosy orthocarpus Orobanchaceae annual herb Jun-Sep None None G3 S1 2B.2 Altered flood/tidal/hydrologic regime, Grazing, Other Meadows and seeps 1030 1850 3380 6070 2020-09-28 Photo of Orthocarpus bracteosus
©2016 Keir Morse
Oenothera pubescens CBR 2024-02-29
No Photo Available
Orobanche californica var. claremontensis CBR 2024-03-06
No Photo Available
Orobanche vallicola CBR 2024-03-06
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 23 April 2024].