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Key to families Table of families and genera
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Scientific Name

Index Page: O

Scientific NameCommon Name
Obione bracteosa
(Under Atriplex serenana)
Synonym
Obione confertifolia
(Under Atriplex confertifolia)
Synonym
Obione cordulata
(Under Atriplex cordulata)
Synonym
Obione coulteri
(Under Atriplex coulteri)
Synonym
Obione elegans
(Under Atriplex elegans)
Synonym
Obione fruticulosa
(Under Atriplex fruticulosa)
Synonym
Obione glauca
(Under Atriplex glauca)
Synonym
Obione hymenelytra
(Under Atriplex hymenelytra)
Synonym
Obione lentiformis
(Under Atriplex lentiformis)
Synonym
Obione leucophylla
(Under Atriplex leucophylla)
Synonym
Obione microcarpa
(Under Atriplex pacifica)
Synonym
Obione parishii
(Under Atriplex parishii)
Synonym
Obione polycarpa
(Under Atriplex polycarpa)
Synonym
Obione pusilla
(Under Atriplex pusilla)
Synonym
Obione radiata
(Under Atriplex elegans)
Synonym
Obione torreyi
(Under Atriplex torreyi var. torreyi)
Synonym
Obione truncata
(Under Atriplex truncata)
Synonym
Obione tularensis
(Under Atriplex tularensis)
Synonym
Ocimum salinum
(Under Frankenia salina)
Synonym
Odontostomum
Odontostomum hartwegiiNative
OemleriaOSO BERRY
Oemleria cerasiformisNative
Oenanthe
Oenanthe pimpinelloides
(Under Oenanthe)
Mentioned in
a note
Oenanthe sarmentosaNative
Oenothera
  ↳  Key to Oenothera
EVENING-PRIMROSE
Oenothera ×erythrosepala Borbás
(Under Oenothera glazioviana)
Synonym
Oenothera abramsii
(Under Camissoniopsis pallida subsp. pallida)
Synonym
Oenothera alyssoides
(Under Eremothera boothii subsp. alyssoides)
Synonym
Oenothera andina
(Under Neoholmgrenia andina)
Synonym
Oenothera arenaria
(Under Chylismia arenaria)
Synonym
Oenothera avita
(Under Oenothera californica subsp. avita)
Synonym
Oenothera avita subsp. eurekensis
(Under Oenothera californica subsp. eurekensis)
Synonym
Oenothera biennisCOMMON EVENING-PRIMROSENaturalized
Oenothera biennis
(Under Oenothera villosa subsp. strigosa)
Synonym
Oenothera bistorta
(Under Camissoniopsis bistorta)
Synonym
Oenothera bistorta var. veitchiana
(Under Camissoniopsis bistorta)
Synonym
Oenothera boothii
(Under Eremothera boothii)
Synonym
Oenothera boothii subsp. condensata
(Under Eremothera boothii subsp. condensata)
Synonym
Oenothera boothii subsp. decorticans
(Under Eremothera boothii subsp. decorticans)
Synonym
Oenothera boothii subsp. desertorum
(Under Eremothera boothii subsp. desertorum)
Synonym
Oenothera boothii subsp. intermedia
(Under Eremothera boothii subsp. intermedia)
Synonym
Oenothera boothii subsp. inyoensis
(Under Eremothera boothii subsp. desertorum)
Synonym
Oenothera boothii subsp. rutila
(Under Eremothera boothii subsp. decorticans)
Synonym
Oenothera brevipes
(Under Chylismia brevipes)
Synonym
Oenothera brevipes subsp. arizonica
(Under Chylismia brevipes subsp. arizonica)
Synonym
Oenothera brevipes subsp. pallidula
(Under Chylismia brevipes subsp. pallidula)
Synonym
Oenothera caespitosa
(Under Oenothera cespitosa)
Synonym
Oenothera caespitosa subsp. crinita
(Under Oenothera cespitosa subsp. crinita)
Synonym
Oenothera caespitosa subsp. marginata
(Under Oenothera cespitosa subsp. marginata)
Synonym
Oenothera californicaNative
Oenothera californica subsp. avitaNative
Oenothera californica subsp. californicaNative
Oenothera californica subsp. eurekensisEUREKA DUNES EVENING-PRIMROSENative
Oenothera californica var. glabrata
(Under Oenothera californica subsp. californica)
Synonym
Oenothera campestris
(Under Camissonia campestris subsp. campestris)
Synonym
Oenothera campestris subsp. parishii
(Under Camissonia campestris subsp. campestris)
Synonym
Oenothera cardiophylla
(Under Chylismia cardiophylla)
Synonym
Oenothera cardiophylla subsp. robusta
(Under Chylismia cardiophylla subsp. robusta)
Synonym
Oenothera cavernaeCAVE EVENING-PRIMROSENative
Oenothera cespitosaFRAGRANT EVENING-PRIMROSENative
Oenothera cespitosa subsp. crinitaCESPITOSE EVENING-PRIMROSENative
Oenothera cespitosa subsp. marginataNative
Oenothera cespitosa var. crinita
(Under Oenothera cespitosa subsp. crinita)
Synonym
Oenothera cespitosa var. marginata
(Under Oenothera cespitosa subsp. marginata)
Synonym
Oenothera chamaenerioides
(Under Eremothera chamaenerioides)
Synonym
Oenothera cheiranthifolia
(Under Camissoniopsis cheiranthifolia)
Synonym
Oenothera cheiranthifolia subsp. suffruticosa
(Under Camissoniopsis cheiranthifolia subsp. suffruticosa)
Synonym
Oenothera cheiranthifolia var. nitida
(Under Camissoniopsis cheiranthifolia)
Synonym
Oenothera cheiranthifolia var. suffruticosa
(Under Camissoniopsis cheiranthifolia subsp. suffruticosa)
Synonym
Oenothera claviformis
(Under Chylismia claviformis)
Synonym
Oenothera claviformis subsp. aurantiaca
(Under Chylismia claviformis subsp. aurantiaca)
Synonym
Oenothera claviformis subsp. citrina
(Under Chylismia claviformis subsp. cruciformis)
Synonym
Oenothera claviformis subsp. cruciformis
(Under Chylismia claviformis subsp. cruciformis)
Synonym
Oenothera claviformis subsp. funerea
(Under Chylismia claviformis subsp. funerea)
Synonym
Oenothera claviformis subsp. integrior
(Under Chylismia claviformis subsp. integrior)
Synonym
Oenothera claviformis subsp. lancifolia
(Under Chylismia claviformis subsp. lancifolia)
Synonym
Oenothera claviformis subsp. peirsonii
(Under Chylismia claviformis subsp. peirsonii)
Synonym
Oenothera claviformis subsp. yumae
(Under Chylismia claviformis subsp. yumae)
Synonym
Oenothera contorta
(Under Camissonia contorta)
Synonym
Oenothera contorta var. flexuosa
(Under Camissonia parvula)
Synonym
Oenothera contorta var. flexuosa
(Under Camissonia pusilla)
Synonym
Oenothera cruciata
(Under Camissonia contorta)
Synonym
Oenothera cruciata
(Under Camissonia lacustris)
Synonym
Oenothera curtifloraLIZARD-TAIL, VELVET WEEDNaturalized
Oenothera decorticans
(Under Eremothera boothii subsp. decorticans)
Synonym
Oenothera deltoidesDEVIL'S LANTERN, LION-IN-A-CAGE, BASKET EVENING-PRIMROSENative
Oenothera deltoides subsp. cognataNative
Oenothera deltoides subsp. deltoidesNative
Oenothera deltoides subsp. howelliiANTIOCH DUNES EVENING-PRIMROSENative
Oenothera deltoides subsp. piperiNative
Oenothera dentata
(Under Camissonia lacustris)
Synonym
Oenothera dentata
(Under Camissonia strigulosa)
Synonym
Oenothera deserti
(Under Eremothera refracta)
Synonym
Oenothera elataNative
Oenothera elata subsp. hirsutissimaNative
Oenothera elata subsp. hookeriNative
Oenothera flavaNative
Oenothera flava subsp. flava
(Under Oenothera flava)
Synonym
Oenothera glaziovianaNaturalized
Oenothera graciliflora
(Under Tetrapteron graciliflorum)
Synonym
Oenothera guadalupensis subsp. clementina
(Under Camissoniopsis guadalupensis subsp. clementina)
Synonym
Oenothera hallii
(Under Camissoniopsis pallida subsp. hallii)
Synonym
Oenothera heterochroma
(Under Chylismia heterochroma)
Synonym
Oenothera heterochroma subsp. monoensis
(Under Chylismia heterochroma)
Synonym
Oenothera heterophylla
(Under Camissoniopsis bistorta)
Synonym
Oenothera hirta
(Under Camissoniopsis intermedia)
Synonym
Oenothera hirta
(Under Camissoniopsis micrantha)
Synonym
Oenothera hirtella
(Under Camissoniopsis hirtella)
Synonym
Oenothera hookeri
(Under Oenothera villosa subsp. strigosa)
Synonym
Oenothera hookeri subsp. angustifolia
(Under Oenothera elata subsp. hirsutissima)
Synonym
Oenothera hookeri subsp. grisea
(Under Oenothera elata subsp. hirsutissima)
Synonym
Oenothera hookeri subsp. montereyensis
(Under Oenothera elata subsp. hookeri)
Synonym
Oenothera hookeri subsp. venusta
(Under Oenothera elata subsp. hirsutissima)
Synonym
Oenothera hookeri subsp. wolfii
(Under Oenothera wolfii)
Synonym
Oenothera ignota
(Under Camissoniopsis confusa)
Synonym
Oenothera ignota
(Under Camissoniopsis ignota)
Synonym
Oenothera kernensis subsp. gilmanii
(Under Camissonia kernensis subsp. gilmanii)
Synonym
Oenothera kernensis subsp. mojavensis
(Under Camissonia kernensis subsp. gilmanii)
Synonym
Oenothera laciniataNaturalized
Oenothera laciniata subsp. pubescens
(Under Oenothera pubescens)
Synonym
Oenothera leptocarpa
(Under Eulobus californicus)
Synonym
Oenothera longissimaLONG-STEM EVENING-PRIMROSENative
Oenothera longissima subsp. clutei
(Under Oenothera longissima)
Synonym
Oenothera micrantha
(Under Camissoniopsis intermedia)
Synonym
Oenothera micrantha
(Under Camissoniopsis lewisii)
Synonym
Oenothera micrantha
(Under Camissoniopsis luciae)
Synonym
Oenothera micrantha
(Under Camissoniopsis micrantha)
Synonym
Oenothera micrantha
(Under Camissoniopsis robusta)
Synonym
Oenothera micrantha var. jonesii
(Under Camissoniopsis hirtella)
Synonym
Oenothera micrantha var. jonesii
(Under Camissoniopsis luciae)
Synonym
Oenothera minor
(Under Eremothera minor)
Synonym
Oenothera multijuga var. parviflora
(Under Chylismia walkeri subsp. tortilis)
Synonym
Oenothera munzii
(Under Chylismia munzii)
Synonym
Oenothera ovata
(Under Taraxia ovata)
Synonym
Oenothera palmeri
(Under Tetrapteron palmeri)
Synonym
Oenothera parvula
(Under Camissonia parvula)
Synonym
Oenothera primiverisNative
Oenothera primiveris subsp. bufonisNative
Oenothera primiveris subsp. caulescens
(Under Oenothera primiveris subsp. primiveris)
Synonym
Oenothera primiveris subsp. primiverisNative
Oenothera pterosperma
(Under Chylismiella pterosperma)
Synonym
Oenothera pubens
(Under Camissonia pubens)
Synonym
Oenothera pubescensNative
Oenothera refracta
(Under Eremothera refracta)
Synonym
Oenothera roseaWaif
Oenothera scapoidea var. tortilis
(Under Chylismia walkeri subsp. tortilis)
Synonym
Oenothera sinuosaWAVY-LEAVED GAURANaturalized
Oenothera speciosaNaturalized
Oenothera speciosa var. childsii
(Under Oenothera speciosa)
Synonym
Oenothera stricta subsp. strictaWaif
Oenothera strigosa
(Under Oenothera villosa subsp. strigosa)
Synonym
Oenothera strigulosa
(Under Camissonia contorta)
Synonym
Oenothera strigulosa
(Under Camissonia strigulosa)
Synonym
Oenothera subacaulis
(Under Taraxia subacaulis)
Synonym
Oenothera subacaulis var. taraxacifolia
(Under Taraxia subacaulis)
Synonym
Oenothera suffrutescensWILD HONEYSUCKLE, LINDA TARDENative
Oenothera tanacetifolia
(Under Taraxia tanacetifolia)
Synonym
Oenothera villosa subsp. strigosaNative
Oenothera walkeri subsp. tortilis
(Under Chylismia walkeri subsp. tortilis)
Synonym
Oenothera wolfiiWOLF'S EVENING-PRIMROSENative
Oenothera xenogauraNaturalized
Oenothera xylocarpaNative
OleaOLIVE
Olea europaeaNaturalized
Olea europaea subsp. africana
(Under Olea europaea)
Synonym
Oleaceae
  ↳  Key to Oleaceae
OLIVE FAMILY
Oligomeris
Oligomeris linifoliaNative
OlneyaIRONWOOD
Olneya tesotaIRONWOODNative
Olsynium
Olsynium douglasii var. douglasiiPURPLE-EYED-GRASS, GRASS WIDOWSNative
Onagraceae
  ↳  Key to Onagraceae
EVENING-PRIMROSE FAMILY
Oncosiphon
Oncosiphon piluliferumSTINKNETNaturalized
Onobrychis
Onobrychis viciifoliaSANFOINNaturalized
Ononis alopecuroides
(Under Fabaceae (Leguminosae))
Mentioned in
a note
Onopordum
  ↳  Key to Onopordum
Onopordum acanthium subsp. acanthiumSCOTCH THISTLENaturalized
Onopordum illyricumILLYRIAN THISTLENaturalized
Onopordum tauricumTAURIAN THISTLENaturalized
Onychium densum
(Under Aspidotis densa)
Synonym
Ophioglossaceae
  ↳  Key to Ophioglossaceae
ADDER'S-TONGUE FAMILY
Ophioglossum
  ↳  Key to Ophioglossum
ADDER'S-TONGUE
Ophioglossum californicumCALIFORNIA ADDER'S-TONGUENative
Ophioglossum lusitanicum subsp. californicum
(Under Ophioglossum californicum)
Synonym
Ophioglossum pusillumNORTHERN ADDER'S-TONGUENative
Ophioglossum vulgatum
(Under Ophioglossum pusillum)
Mentioned in
a note
Ophioglossum vulgatum var. pseudopodum
(Under Ophioglossum pusillum)
Synonym
Opuntia
  ↳  Key to Opuntia
PRICKLY-PEAR
Opuntia ×fosbergii C.B. Wolf
(Under Cylindropuntia fosbergii)
Synonym
Opuntia ×munzii C.B. Wolf
(Under Cylindropuntia munzii)
Synonym
Opuntia ×occidentalisNative
Opuntia ×vaseyi (J. M. Coult.) Britton & Rose
(Under Opuntia vaseyi)
Synonym
Opuntia ×wigginsii L.D. Benson
(Under Cylindropuntia echinocarpa)
Synonym
Opuntia acanthocarpa subsp. ganderi
(Under Cylindropuntia ganderi)
Synonym
Opuntia acanthocarpa var. coloradensis
(Under Cylindropuntia acanthocarpa var. acanthocarpa)
Synonym
Opuntia basilarisNative
Opuntia basilaris var. basilarisBEAVERTAILNative
Opuntia basilaris var. brachycladaSHORT-JOINT BEAVERTAILNative
Opuntia basilaris var. ramosa
(Under Opuntia basilaris var. basilaris)
Synonym
Opuntia basilaris var. treleaseiBAKERSFIELD CACTUSNative
Opuntia bernardina
(Under Cylindropuntia californica var. parkeri)
Synonym
Opuntia bigelovii
(Under Cylindropuntia bigelovii)
Synonym
Opuntia bigelovii var. hoffmannii
(Under Cylindropuntia fosbergii)
Synonym
Opuntia californica var. parkeri
(Under Cylindropuntia californica var. parkeri)
Synonym
Opuntia chloroticaPANCAKE PRICKLY-PEARNative
Opuntia curvispina
(Under Opuntia chlorotica)
Mentioned in
a note
Opuntia curvispina
(Under Opuntia phaeacantha)
Mentioned in
a note
Opuntia demissa
(Under Opuntia oricola)
Mentioned in
a note
Opuntia echinocarpa
(Under Cylindropuntia echinocarpa)
Synonym
Opuntia echinocarpa var. parkeri
(Under Cylindropuntia californica var. parkeri)
Synonym
Opuntia engelmannii
(Under Opuntia ×occidentalis)
Mentioned in
a note
Opuntia engelmannii var. engelmanniiENGELMANN PRICKLY-PEARNative
Opuntia erinacea var. erinacea
(Under Opuntia polyacantha var. erinacea)
Synonym
Opuntia erinacea var. hystricina
(Under Opuntia polyacantha var. hystricina)
Synonym
Opuntia erinacea var. ursina
(Under Opuntia polyacantha var. erinacea)
Synonym
Opuntia erinacea var. utahensis
(Under Opuntia polyacantha var. erinacea)
Synonym
Opuntia ficus-indicaMISSION PRICKLY-PEARNaturalized
Opuntia ficus-indica
(Under Opuntia ×occidentalis)
Synonym
Opuntia fosbergii
(Under Cylindropuntia fosbergii)
Synonym
Opuntia fragilisBRITTLE PRICKLY-PEARNative
Opuntia ganderi
(Under Cylindropuntia ganderi)
Synonym
Opuntia humistrata
(Under Opuntia basilaris var. brachyclada)
Synonym
Opuntia leucotrichaNOPAL DURAZNILLOWaif
Opuntia littoralisNative
Opuntia littoralis
(Under Opuntia oricola)
Synonym
Opuntia littoralis var. austrocalifornica
(Under Opuntia vaseyi)
Synonym
Opuntia littoralis var. piercei
(Under Opuntia phaeacantha)
Synonym
Opuntia littoralis var. vaseyi
(Under Opuntia vaseyi)
Synonym
Opuntia megacantha
(Under Opuntia ficus-indica)
Synonym
Opuntia microdasysBUNNY EARSNaturalized
Opuntia munzii
(Under Cylindropuntia munzii)
Synonym
Opuntia occidentalis
(Under Opuntia littoralis)
Synonym
Opuntia occidentalis var. covillei
(Under Opuntia vaseyi)
Synonym
Opuntia oricolaNative
Opuntia parishii
(Under Grusonia parishii)
Synonym
Opuntia parryi
(Under Cylindropuntia californica var. parkeri)
Synonym
Opuntia parryi var. parryi
(Under Cylindropuntia californica var. parkeri)
Synonym
Opuntia parryi var. serpentina
(Under Cylindropuntia californica var. californica)
Synonym
Opuntia phaeacanthaBROWN-SPINED PRICKLY-PEARNative
Opuntia phaeacantha var. discata
(Under Opuntia engelmannii var. engelmannii)
Synonym
Opuntia phaeacantha var. major
(Under Opuntia phaeacantha)
Synonym
Opuntia polyacanthaSTARVATION PRICKLY-PEARNative
Opuntia polyacantha var. erinaceaMOJAVE PRICKLY-PEAR, GRIZZLY BEAR PRICKLY-PEARNative
Opuntia polyacantha var. hystricinaPORCUPINE PRICKLY-PEARNative
Opuntia polyacantha var. rufispina
(Under Opuntia polyacantha var. erinacea)
Synonym
Opuntia prolifera
(Under Cylindropuntia prolifera)
Synonym
Opuntia pulchella
(Under Grusonia pulchella)
Synonym
Opuntia ramosissima
(Under Cylindropuntia ramosissima)
Synonym
Opuntia robustaNOPAL TAPONWaif
Opuntia semispinosa
(Under Opuntia littoralis)
Synonym
Opuntia serpentina
(Under Cylindropuntia californica var. californica)
Synonym
Opuntia stanlyi
(Under Grusonia parishii)
Synonym
Opuntia stanlyi var. parishii
(Under Grusonia parishii)
Synonym
Opuntia treleasei
(Under Opuntia basilaris var. treleasei)
Synonym
Opuntia ursina
(Under Opuntia polyacantha var. erinacea)
Synonym
Opuntia vaseyiNative
Opuntia whitneyana
(Under Opuntia basilaris var. basilaris)
Synonym
Opuntia wigginsii
(Under Cylindropuntia echinocarpa)
Synonym
Opuntia wolfii
(Under Cylindropuntia wolfii)
Synonym
Orchidaceae
  ↳  Key to Orchidaceae
ORCHID FAMILY
Orcuttia
  ↳  Key to Orcuttia
Orcuttia californicaCALIFORNIA ORCUTT GRASSNative
Orcuttia californica var. inaequalis
(Under Orcuttia inaequalis)
Synonym
Orcuttia californica var. viscida
(Under Orcuttia viscida)
Synonym
Orcuttia greenei
(Under Tuctoria greenei)
Synonym
Orcuttia inaequalisSAN JOAQUIN VALLEY ORCUTT GRASSNative
Orcuttia mucronata
(Under Tuctoria mucronata)
Synonym
Orcuttia pilosaHAIRY ORCUTT GRASSNative
Orcuttia tenuisSLENDER ORCUTT GRASSNative
Orcuttia viscidaSACRAMENTO ORCUTT GRASSNative
Oreobroma aridorum
(Under Lewisia pygmaea)
Synonym
Oreobroma brachycalyx
(Under Lewisia brachycalyx)
Synonym
Oreobroma congdonii
(Under Lewisia congdonii)
Synonym
Oreobroma exarticulatum
(Under Lewisia pygmaea)
Synonym
Oreobroma heckneri
(Under Lewisia cotyledon var. heckneri)
Synonym
Oreobroma howellii
(Under Lewisia cotyledon var. howellii)
Synonym
Oreobroma leeanum
(Under Lewisia leeana)
Synonym
Oreobroma longipetalum
(Under Lewisia longipetala)
Synonym
Oreobroma oppositifolium
(Under Lewisia oppositifolia)
Synonym
Oreobroma triphyllum
(Under Lewisia triphylla)
Synonym
Oreocarya alpicola
(Under Cryptantha humilis)
Synonym
Oreonana
  ↳  Key to Oreonana
Oreonana clementisNative
Oreonana purpurascensPURPLE MOUNTAIN-PARSLEYNative
Oreonana vestitaWOOLLY MOUNTAIN-PARSLEYNative
Oreostemma
  ↳  Key to Oreostemma
ASTER
Oreostemma alpigenum var. alpigenum
(Under Oreostemma alpigenum var. andersonii)
Mentioned in
a note
Oreostemma alpigenum var. andersoniiNative
Oreostemma alpigenum var. haydenii
(Under Oreostemma alpigenum var. andersonii)
Mentioned in
a note
Oreostemma elatumTALL ALPINE-ASTERNative
Oreostemma peirsoniiNative
Origanum
  ↳  Key to Origanum
Origanum ×majoricumITALIAN OREGANO, HARDY SWEET MARJORAMNaturalized
Origanum dictamnus
(Under Origanum)
Mentioned in
a note
Origanum majorana
(Under Origanum)
Mentioned in
a note
Origanum majorana
(Under Origanum ×majoricum)
Mentioned in
a note
Origanum vulgare
(Under Origanum ×majoricum)
Mentioned in
a note
Origanum vulgare
(Under Origanum vulgare subsp. hirtum)
Mentioned in
a note
Origanum vulgare subsp. hirtumOREGANONaturalized
Ornithopus
  ↳  Key to Ornithopus
Ornithopus pinnatusNaturalized
Ornithopus sativusCOMMON BIRDSFOOTNaturalized
Ornithopus sativus subsp. isthmocarpus
(Under Ornithopus sativus)
Synonym
Ornithopus sativus subsp. sativus
(Under Ornithopus sativus)
Synonym
Ornithopus sativus var. macrorrhynchus
(Under Ornithopus sativus)
Synonym
Ornithostaphylos
Ornithostaphylos oppositifoliaBAJA CALIFORNIA BIRDBUSHNative
Orobanchaceae
  ↳  Key to Orobanchaceae
BROOMRAPE FAMILY
Orobanche
  ↳  Key to Orobanche
BROOMRAPE
Orobanche bulbosaNative
Orobanche californicaNative
Orobanche californica subsp. californicaNative
Orobanche californica subsp. condensaNative
Orobanche californica subsp. feudgeiNative
Orobanche californica subsp. grandisNative
Orobanche californica subsp. grayanaNative
Orobanche californica subsp. jepsoniiNative
Orobanche californica var. californica
(Under Orobanche vallicola)
Synonym
Orobanche californica var. claremontensis
(Under Orobanche vallicola)
Synonym
Orobanche californica var. corymbosa
(Under Orobanche corymbosa)
Synonym
Orobanche californica var. parishii
(Under Orobanche parishii subsp. parishii)
Synonym
Orobanche cooperiNative
Orobanche corymbosaNative
Orobanche fasciculataCLUSTERED BROOMRAPENative
Orobanche fasciculata var. franciscana
(Under Orobanche fasciculata)
Synonym
Orobanche fasciculata var. lutea
(Under Orobanche fasciculata)
Synonym
Orobanche grayana var. feudgei
(Under Orobanche californica subsp. feudgei)
Synonym
Orobanche grayana var. grayana
(Under Orobanche californica subsp. grayana)
Synonym
Orobanche grayana var. jepsonii
(Under Orobanche californica subsp. jepsonii)
Synonym
Orobanche grayana var. nelsonii
(Under Orobanche californica subsp. californica)
Synonym
Orobanche grayana var. violacea
(Under Orobanche californica subsp. californica)
Synonym
Orobanche ludoviciana var. cooperi
(Under Orobanche cooperi)
Synonym
Orobanche ludoviciana var. latiloba
(Under Orobanche cooperi)
Synonym
Orobanche parishiiNative
Orobanche parishii subsp. brachylobaSHORT-LOBED BROOMRAPENative
Orobanche parishii subsp. parishiiNative
Orobanche pinorumNative
Orobanche ramosaNaturalized
Orobanche unifloraNAKED BROOMRAPENative
Orobanche uniflora subsp. occidentalis
(Under Orobanche uniflora)
Synonym
Orobanche uniflora var. minuta
(Under Orobanche uniflora)
Synonym
Orobanche uniflora var. purpurea
(Under Orobanche uniflora)
Mentioned in
a note
Orobanche uniflora var. sedi
(Under Orobanche uniflora)
Synonym
Orobanche validaNative
Orobanche valida subsp. howelliiHOWELL'S BROOMRAPENative
Orobanche valida subsp. validaROCK CREEK BROOMRAPENative
Orobanche vallicolaNative
Orochaenactis
Orochaenactis thysanocarphaNative
Orogenia
Orogenia fusiformisNative
Orthilia
Orthilia secundaONE-SIDED WINTERGREENNative
Orthocarpus
  ↳  Key to Orthocarpus
Orthocarpus attenuatus
(Under Castilleja attenuata)
Synonym
Orthocarpus bidwelliae var. micranthus
(Under Triphysaria micrantha)
Synonym
Orthocarpus bracteosusNative
Orthocarpus brevistyla
(Under Castilleja brevistyla)
Synonym
Orthocarpus campestris
(Under Castilleja campestris)
Synonym
Orthocarpus campestris var. succulentus
(Under Castilleja campestris subsp. succulenta)
Synonym
Orthocarpus castillejoides
(Under Castilleja ambigua)
Synonym
Orthocarpus castillejoides var. humboldtiensis
(Under Castilleja ambigua subsp. humboldtiensis)
Synonym
Orthocarpus castillejoides var. insalutatus
(Under Castilleja ambigua subsp. insalutata)
Synonym
Orthocarpus copelandii
(Under Orthocarpus cuspidatus subsp. copelandii)
Synonym
Orthocarpus copelandii var. cryptanthus
(Under Orthocarpus cuspidatus subsp. cryptanthus)
Synonym
Orthocarpus cuspidatusNative
Orthocarpus cuspidatus subsp. copelandiiNative
Orthocarpus cuspidatus subsp. cryptanthusNative
Orthocarpus cuspidatus subsp. cuspidatusSISKIYOU MOUNTAINS ORTHOCARPUSNative
Orthocarpus densiflorus
(Under Castilleja densiflora)
Synonym
Orthocarpus densiflorus
(Under Castilleja densiflora subsp. densiflora)
Synonym
Orthocarpus densiflorus subsp. gracilis
(Under Castilleja densiflora subsp. gracilis)
Synonym
Orthocarpus densiflorus var. gracilis
(Under Castilleja densiflora subsp. gracilis)
Synonym
Orthocarpus densiflorus var. obispoensis
(Under Castilleja densiflora subsp. obispoensis)
Synonym
Orthocarpus erianthus
(Under Triphysaria eriantha subsp. eriantha)
Synonym
Orthocarpus erianthus var. gratiosus
(Under Triphysaria eriantha subsp. eriantha)
Synonym
Orthocarpus erianthus var. micranthus
(Under Triphysaria micrantha)
Synonym
Orthocarpus erianthus var. roseus
(Under Triphysaria eriantha subsp. rosea)
Synonym
Orthocarpus faucibarbatus
(Under Triphysaria versicolor subsp. faucibarbata)
Synonym
Orthocarpus faucibarbatus subsp. albidus
(Under Triphysaria versicolor subsp. versicolor)
Synonym
Orthocarpus floribundus
(Under Triphysaria floribunda)
Synonym
Orthocarpus hispidus
(Under Castilleja tenuis)
Synonym
Orthocarpus imbricatusNative
Orthocarpus lacerus
(Under Castilleja lacera)
Synonym
Orthocarpus lasiorhynchus
(Under Castilleja lasiorhyncha)
Synonym
Orthocarpus linearilobus
(Under Castilleja lineariloba)
Synonym
Orthocarpus lithospermoides var. bicolor
(Under Castilleja rubicundula subsp. rubicundula)
Synonym
Orthocarpus lithospermoides var. lithospermoides
(Under Castilleja rubicundula subsp. lithospermoides)
Synonym
Orthocarpus luteusNative
Orthocarpus micranthus
(Under Triphysaria micrantha)
Synonym
Orthocarpus pachystachyusSHASTA ORTHOCARPUSNative
Orthocarpus purpurascens
(Under Castilleja exserta)
Synonym
Orthocarpus purpurascens
(Under Castilleja exserta subsp. exserta)
Synonym
Orthocarpus purpurascens var. latifolius
(Under Castilleja exserta subsp. latifolia)
Synonym
Orthocarpus purpurascens var. ornatus
(Under Castilleja exserta subsp. venusta)
Synonym
Orthocarpus purpurascens var. pallidus
(Under Castilleja exserta subsp. exserta)
Synonym
Orthocarpus pusillus
(Under Triphysaria pusilla)
Synonym
Orthocarpus versicolor var. roseus
(Under Triphysaria eriantha subsp. rosea)
Synonym
Oryctes
Oryctes nevadensisNEVADA ORYCTESNative
OryzaRICE
Oryza rufipogon
(Under Oryza)
Mentioned in
a note
Oryza sativaNaturalized
Oryzopsis bloomeri
(Under Stipa hymenoides)
Mentioned in
a note
Oryzopsis bloomeri
(Under Stipa occidentalis var. occidentalis)
Mentioned in
a note
Oryzopsis exigua
(Under Stipa exigua)
Synonym
Oryzopsis hymenoides
(Under Stipa hymenoides)
Synonym
Oryzopsis kingii
(Under Stipa kingii)
Synonym
Oryzopsis micrantha
(Under Stipa divaricata)
Synonym
Oryzopsis miliacea f. ex
(Under Stipa miliacea var. miliacea)
Synonym
Oryzopsis webberi
(Under Stipa webberi)
Synonym
Osmadenia
Osmadenia tenellaOSMADENIANative
Osmaronia cerasiformis
(Under Oemleria cerasiformis)
Synonym
Osmorhiza
  ↳  Key to Osmorhiza
SWEET-CICELY
Osmorhiza berteroiNative
Osmorhiza brachypodaNative
Osmorhiza chilensis
(Under Osmorhiza berteroi)
Synonym
Osmorhiza depauperataBLUNT-FRUITED SWEET-CICELYNative
Osmorhiza occidentalisNative
Osmorhiza purpureaNative
Osteospermum ecklonis
(Under Dimorphotheca ecklonis)
Synonym
Osteospermum ecklonis
(Under Asteraceae (Compositae))
Mentioned in
a note
Osteospermum fruticosum
(Under Dimorphotheca fruticosa)
Synonym
Ottelia
Ottelia alismoidesExtirpated alien
Ourisia californica
(Under Hesperochiron californicus)
Synonym
OxalidaceaeOXALIS FAMILY
Oxalis
  ↳  Key to Oxalis
Oxalis albicans subsp. californica
(Under Oxalis californica)
Synonym
Oxalis albicans subsp. pilosa
(Under Oxalis pilosa)
Synonym
Oxalis articulata subsp. rubraWINDOWBOX WOOD-SORRELNaturalized
Oxalis bowieiBOWIE'S WOOD-SORRELWaif
Oxalis californicaCALIFORNIA WOOD-SORRELNative
Oxalis cernua
(Under Oxalis pes-caprae)
Synonym
Oxalis corniculataNaturalized
Oxalis corniculata subsp. pilosa
(Under Oxalis pilosa)
Synonym
Oxalis corniculata var. wrightii
(Under Oxalis pilosa)
Synonym
Oxalis hirta
(Under Oxalis)
Mentioned in
a note
Oxalis incarnataCRIMSON WOOD-SORRELNaturalized
Oxalis latifolia
(Under Oxalis)
Mentioned in
a note
Oxalis laxa
(Under Oxalis micrantha)
Synonym
Oxalis micranthaDWARF WOOD-SORRELNaturalized
Oxalis oreganaREDWOOD SORRELNative
Oxalis pes-capraeBERMUDA BUTTERCUPNaturalized
Oxalis pilosaNative
Oxalis purpureaPURPLE WOOD-SORRELWaif
Oxalis rubra
(Under Oxalis articulata subsp. rubra)
Synonym
Oxalis suksdorfiiSUKSDORF'S WOOD-SORRELNative
Oxalis trilliifoliaNative
Oxalis variabilis
(Under Oxalis purpurea)
Synonym
Oxybaphus coccineus
(Under Mirabilis coccinea)
Synonym
Oxybaphus laevis
(Under Mirabilis laevis)
Synonym
Oxybaphus nyctagineus
(Under Mirabilis nyctaginea)
Synonym
Oxypolis
Oxypolis occidentalisNative
OxyriaMOUNTAIN SORREL
Oxyria digynaNative
Oxystylis
Oxystylis luteaNative
Oxytenia acerosa
(Under Euphrosyne acerosa)
Synonym
Oxytheca
  ↳  Key to Oxytheca
Oxytheca abramsii
(Under Acanthoscyphus parishii var. abramsii)
Synonym
Oxytheca caryophylloides
(Under Sidotheca caryophylloides)
Synonym
Oxytheca dendroidea subsp. dendroideaTREE-LIKE PUNCTUREBRACTNative
Oxytheca dendroidea var. foliosa
(Under Oxytheca dendroidea subsp. dendroidea)
Synonym
Oxytheca dendroidea var. hillmanii
(Under Oxytheca dendroidea subsp. dendroidea)
Synonym
Oxytheca emarginata
(Under Sidotheca emarginata)
Synonym
Oxytheca foliosa
(Under Oxytheca dendroidea subsp. dendroidea)
Synonym
Oxytheca glandulosa
(Under Eriogonum glandulosum)
Synonym
Oxytheca hirtiflora
(Under Eriogonum hirtiflorum)
Synonym
Oxytheca inermis
(Under Eriogonum inerme var. inerme)
Synonym
Oxytheca insignis
(Under Aristocapsa insignis)
Synonym
Oxytheca luteola
(Under Goodmania luteola)
Synonym
Oxytheca parishii
(Under Acanthoscyphus parishii)
Synonym
Oxytheca parishii subsp. abramsii
(Under Acanthoscyphus parishii var. abramsii)
Synonym
Oxytheca parishii var. abramsii
(Under Acanthoscyphus parishii var. abramsii)
Synonym
Oxytheca parishii var. cienegensis
(Under Acanthoscyphus parishii var. cienegensis)
Synonym
Oxytheca parishii var. goodmaniana
(Under Acanthoscyphus parishii var. goodmaniana)
Synonym
Oxytheca parishii var. parishii
(Under Acanthoscyphus parishii var. parishii)
Synonym
Oxytheca perfoliataROUND-LEAF PUNCTUREBRACTNative
Oxytheca reddingiana
(Under Eriogonum spergulinum var. reddingianum)
Synonym
Oxytheca spergulina
(Under Eriogonum spergulinum var. spergulinum)
Synonym
Oxytheca trilobata
(Under Sidotheca trilobata)
Synonym
Oxytheca watsoniiWATSON'S OXYTHECANative
Oxytheca watsonii
(Under Acanthoscyphus parishii var. goodmaniana)
Synonym
Oxytropis
  ↳  Key to Oxytropis
LOCOWEED, OXYTROPE
Oxytropis borealisBOREAL LOCOWEEDNative
Oxytropis borealis var. australisNative
Oxytropis borealis var. viscidaSTICKY OXYTROPENative
Oxytropis deflexa var. culminis
(Under Oxytropis deflexa var. sericea)
Synonym
Oxytropis deflexa var. sericeaBLUE PENDENT-POD OXYTROPENative
Oxytropis oreophila var. oreophilaROCK-LOVING OXYTROPENative
Oxytropis parryiPARRY'S OXYTROPENative
Oxytropis viscida
(Under Oxytropis borealis var. viscida)
Synonym
Ozomelis
  ↳  Key to Ozomelis
Ozomelis diversifoliaNative
Ozomelis trifidaNative