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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 (tjm2)
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 (tjm2)
Obione truncata
(Under Atriplex truncata)
Synonym
Obione tularensis
(Under Atriplex tularensis)
Synonym
Ocimum salinum
(Under Frankenia salina)
Synonym (tjm2)
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
(Under Oenothera glazioviana)
Synonym (tjm2)
Oenothera abramsii
(Under Camissoniopsis pallida subsp. pallida)
Synonym (tjm2)
Oenothera alyssoides
(Under Eremothera boothii subsp. alyssoides)
Synonym (tjm2)
Oenothera andina
(Under Neoholmgrenia andina)
Synonym (tjm2)
Oenothera arenaria
(Under Chylismia arenaria)
Synonym (tjm2)
Oenothera avita
(Under Oenothera californica subsp. avita)
Synonym (tjm2)
Oenothera avita subsp. eurekensis
(Under Oenothera californica subsp. eurekensis)
Synonym (tjm2)
Oenothera biennisCOMMON EVENING-PRIMROSENaturalized
Oenothera biennis
(Under Oenothera villosa subsp. strigosa)
Synonym (tjm2)
Oenothera bistorta
(Under Camissoniopsis bistorta)
Synonym (tjm2)
Oenothera bistorta var. veitchiana
(Under Camissoniopsis bistorta)
Synonym (tjm2)
Oenothera boothii
(Under Eremothera boothii)
Synonym
Oenothera boothii subsp. condensata
(Under Eremothera boothii subsp. condensata)
Synonym (tjm2)
Oenothera boothii subsp. decorticans
(Under Eremothera boothii subsp. decorticans)
Synonym (tjm2)
Oenothera boothii subsp. desertorum
(Under Eremothera boothii subsp. desertorum)
Synonym (tjm2)
Oenothera boothii subsp. intermedia
(Under Eremothera boothii subsp. intermedia)
Synonym (tjm2)
Oenothera boothii subsp. inyoensis
(Under Eremothera boothii subsp. desertorum)
Synonym (tjm2)
Oenothera boothii subsp. rutila
(Under Eremothera boothii subsp. decorticans)
Synonym (tjm2)
Oenothera brevipes
(Under Chylismia brevipes)
Synonym
Oenothera brevipes subsp. arizonica
(Under Chylismia brevipes subsp. arizonica)
Synonym (tjm2)
Oenothera brevipes subsp. pallidula
(Under Chylismia brevipes subsp. pallidula)
Synonym (tjm2)
Oenothera caespitosa subsp. crinita
(Under Oenothera cespitosa subsp. crinita)
Synonym (tjm2)
Oenothera caespitosa subsp. marginata
(Under Oenothera cespitosa subsp. marginata)
Synonym (tjm2)
Oenothera caespitosa, orth. var.
(Under Oenothera cespitosa)
Synonym (tjm2)
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 (tjm2)
Oenothera campestris
(Under Camissonia campestris subsp. campestris)
Synonym (tjm2)
Oenothera campestris subsp. parishii
(Under Camissonia campestris subsp. campestris)
Synonym (tjm2)
Oenothera cardiophylla
(Under Chylismia cardiophylla)
Synonym
Oenothera cardiophylla subsp. robusta
(Under Chylismia cardiophylla subsp. robusta)
Synonym (tjm2)
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 (tjm2)
Oenothera cespitosa var. marginata
(Under Oenothera cespitosa subsp. marginata)
Synonym (tjm2)
Oenothera chamaenerioides
(Under Eremothera chamaenerioides)
Synonym (tjm2)
Oenothera cheiranthifolia
(Under Camissoniopsis cheiranthifolia)
Synonym
Oenothera cheiranthifolia subsp. suffruticosa
(Under Camissoniopsis cheiranthifolia subsp. suffruticosa)
Synonym (tjm2)
Oenothera cheiranthifolia var. nitida
(Under Camissoniopsis cheiranthifolia)
Synonym
Oenothera cheiranthifolia var. suffruticosa
(Under Camissoniopsis cheiranthifolia subsp. suffruticosa)
Synonym (tjm2)
Oenothera claviformis
(Under Chylismia claviformis)
Synonym
Oenothera claviformis subsp. aurantiaca
(Under Chylismia claviformis subsp. aurantiaca)
Synonym (tjm2)
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 (tjm2)
Oenothera claviformis subsp. integrior
(Under Chylismia claviformis subsp. integrior)
Synonym (tjm2)
Oenothera claviformis subsp. lancifolia
(Under Chylismia claviformis subsp. lancifolia)
Synonym (tjm2)
Oenothera claviformis subsp. peirsonii
(Under Chylismia claviformis subsp. peirsonii)
Synonym (tjm2)
Oenothera claviformis subsp. yumae
(Under Chylismia claviformis subsp. yumae)
Synonym (tjm2)
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 (tjm2)
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 (tjm2)
Oenothera deserti
(Under Eremothera refracta)
Synonym (tjm2)
Oenothera elataNative
Oenothera elata subsp. hirsutissimaNative
Oenothera elata subsp. hookeriNative
Oenothera flavaNative
Oenothera flava subsp. flava
(Under Oenothera flava)
Synonym (tjm2)
Oenothera glaziovianaNaturalized
Oenothera graciliflora
(Under Tetrapteron graciliflorum)
Synonym (tjm2)
Oenothera guadalupensis subsp. clementina
(Under Camissoniopsis guadalupensis subsp. clementina)
Synonym (tjm2)
Oenothera hallii
(Under Camissoniopsis pallida subsp. hallii)
Synonym (tjm2)
Oenothera heterochroma
(Under Chylismia heterochroma)
Synonym (tjm2)
Oenothera heterochroma subsp. monoensis
(Under Chylismia heterochroma)
Synonym (tjm2)
Oenothera heterophylla
(Under Camissoniopsis bistorta)
Synonym (tjm2)
Oenothera hirta
(Under Camissoniopsis intermedia)
Synonym
Oenothera hirta
(Under Camissoniopsis micrantha)
Synonym
Oenothera hirtella
(Under Camissoniopsis hirtella)
Synonym (tjm2)
Oenothera hookeri subsp. angustifolia
(Under Oenothera elata subsp. hirsutissima)
Synonym (tjm2)
Oenothera hookeri subsp. grisea
(Under Oenothera elata subsp. hirsutissima)
Synonym (tjm2)
Oenothera hookeri subsp. montereyensis
(Under Oenothera elata subsp. hookeri)
Synonym (tjm2)
Oenothera hookeri subsp. venusta
(Under Oenothera elata subsp. hirsutissima)
Synonym (tjm2)
Oenothera hookeri subsp. wolfii
(Under Oenothera wolfii)
Mentioned in
a note
Oenothera hookeri subsp. wolfii
(Under Oenothera wolfii)
Synonym (tjm2)
Oenothera hookeri, misappl.
(Under Oenothera villosa subsp. strigosa)
Synonym (tjm2)
Oenothera ignota
(Under Camissoniopsis confusa)
Synonym
Oenothera ignota
(Under Camissoniopsis ignota)
Synonym (tjm2)
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 (tjm2)
Oenothera leptocarpa
(Under Eulobus californicus)
Synonym (tjm2)
Oenothera longissimaLONG-STEM EVENING-PRIMROSENative
Oenothera longissima subsp. clutei
(Under Oenothera longissima)
Synonym (tjm2)
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. ignota
(Under Camissoniopsis ignota)
Synonym (tjm2)
Oenothera micrantha var. jonesii
(Under Camissoniopsis hirtella)
Synonym (tjm2)
Oenothera micrantha var. jonesii
(Under Camissoniopsis luciae)
Synonym
Oenothera minor
(Under Eremothera minor)
Synonym (tjm2)
Oenothera multijuga var. parviflora
(Under Chylismia walkeri subsp. tortilis)
Synonym (tjm2)
Oenothera munzii
(Under Chylismia munzii)
Synonym (tjm2)
Oenothera ovata
(Under Taraxia ovata)
Synonym (tjm2)
Oenothera palmeri
(Under Tetrapteron palmeri)
Synonym (tjm2)
Oenothera parvula
(Under Camissonia parvula)
Synonym
Oenothera primiverisNative
Oenothera primiveris subsp. bufonisNative
Oenothera primiveris subsp. caulescens
(Under Oenothera primiveris subsp. primiveris)
Synonym (tjm2)
Oenothera primiveris subsp. primiverisNative
Oenothera pterosperma
(Under Chylismiella pterosperma)
Synonym (tjm2)
Oenothera pubens
(Under Camissonia pubens)
Synonym (tjm2)
Oenothera pubescensNative
Oenothera refracta
(Under Eremothera refracta)
Synonym (tjm2)
Oenothera roseaWaif
Oenothera scapoidea var. tortilis
(Under Chylismia walkeri subsp. tortilis)
Synonym (tjm2)
Oenothera sinuosaWAVY-LEAVED GAURANaturalized
Oenothera speciosaNaturalized
Oenothera speciosa var. childsii
(Under Oenothera speciosa)
Synonym (tjm2)
Oenothera stricta subsp. strictaWaif
Oenothera strigosa
(Under Oenothera villosa subsp. strigosa)
Synonym (tjm2)
Oenothera strigulosa
(Under Camissonia contorta)
Synonym
Oenothera strigulosa
(Under Camissonia strigulosa)
Synonym (tjm2)
Oenothera subacaulis
(Under Taraxia subacaulis)
Synonym (tjm2)
Oenothera subacaulis var. taraxacifolia
(Under Taraxia subacaulis)
Synonym (tjm2)
Oenothera suffrutescensWILD HONEYSUCKLE, LINDA TARDENative
Oenothera tanacetifolia
(Under Taraxia tanacetifolia)
Synonym (tjm2)
Oenothera villosa subsp. strigosaNative
Oenothera walkeri subsp. tortilis
(Under Chylismia walkeri subsp. tortilis)
Synonym (tjm2)
Oenothera wolfiiWOLF'S EVENING-PRIMROSENative
Oenothera xenogauraNaturalized
Oenothera xylocarpaNative
OleaOLIVE
Olea europaeaNaturalized
Olea europaea subsp. africana
(Under Olea europaea)
Synonym (tjm2)
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)
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 (tjm2)
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 (tjm2)
Ophioglossum pusillumNORTHERN ADDER'S-TONGUENative
Ophioglossum vulgatum
(Under Ophioglossum pusillum)
Mentioned in
a note
Ophioglossum vulgatum var. pseudopodum
(Under Ophioglossum pusillum)
Synonym (tjm2)
Opuntia
  ↳  Key to Opuntia
PRICKLY-PEAR
Opuntia
(Under Cylindropuntia echinocarpa)
Synonym (tjm2)
Opuntia
(Under Cylindropuntia fosbergii)
Synonym (tjm2)
Opuntia
(Under Cylindropuntia munzii)
Synonym (tjm2)
Opuntia
(Under Opuntia vaseyi)
Synonym (tjm2)
Opuntia ×occidentalisNative
Opuntia acanthocarpa subsp. ganderi
(Under Cylindropuntia ganderi)
Synonym
Opuntia acanthocarpa var. coloradensis
(Under Cylindropuntia acanthocarpa var. acanthocarpa)
Synonym (tjm2)
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 (tjm2)
Opuntia bigelovii
(Under Cylindropuntia bigelovii)
Synonym (tjm2)
Opuntia bigelovii var. hoffmannii
(Under Cylindropuntia fosbergii)
Synonym (tjm2)
Opuntia californica var. parkeri
(Under Cylindropuntia californica var. parkeri)
Synonym (tjm2)
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 (tjm2)
Opuntia echinocarpa var. parkeri
(Under Cylindropuntia californica var. parkeri)
Synonym (tjm2)
Opuntia engelmannii
(Under Opuntia)
Mentioned in
a note
Opuntia engelmannii var. engelmanniiENGELMANN PRICKLY-PEARNative
Opuntia erinacea var. erinacea
(Under Opuntia polyacantha var. erinacea)
Synonym (tjm2)
Opuntia erinacea var. hystricina
(Under Opuntia polyacantha var. hystricina)
Synonym
Opuntia erinacea var. ursina
(Under Opuntia polyacantha var. erinacea)
Synonym (tjm2)
Opuntia erinacea var. utahensis
(Under Opuntia polyacantha var. erinacea)
Synonym (tjm2)
Opuntia ficus-indicaMISSION PRICKLY-PEARNaturalized
Opuntia ficus-indica, misappl.
(Under Opuntia)
Synonym
Opuntia fosbergii
(Under Cylindropuntia fosbergii)
Synonym (tjm2)
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 (tjm2)
Opuntia occidentalis
(Under Opuntia littoralis)
Synonym
Opuntia occidentalis var. covillei
(Under Opuntia vaseyi)
Synonym
Opuntia oricolaNative
Opuntia parishii
(Under Grusonia parishii)
Synonym (tjm2)
Opuntia parryi
(Under Cylindropuntia californica var. parkeri)
Synonym (tjm2)
Opuntia parryi var. parryi
(Under Cylindropuntia californica var. parkeri)
Synonym (tjm2)
Opuntia parryi var. serpentina
(Under Cylindropuntia californica var. californica)
Synonym (tjm2)
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 (tjm2)
Opuntia prolifera
(Under Cylindropuntia prolifera)
Synonym (tjm2)
Opuntia pulchella
(Under Grusonia pulchella)
Synonym (tjm2)
Opuntia ramosissima
(Under Cylindropuntia ramosissima)
Synonym (tjm2)
Opuntia robustaNOPAL TAPONWaif
Opuntia semispinosa
(Under Opuntia littoralis)
Synonym
Opuntia serpentina
(Under Cylindropuntia californica var. californica)
Synonym (tjm2)
Opuntia stanlyi
(Under Grusonia parishii)
Synonym (tjm2)
Opuntia stanlyi var. parishii
(Under Grusonia parishii)
Synonym (tjm2)
Opuntia treleasei
(Under Opuntia basilaris var. treleasei)
Synonym
Opuntia ursina
(Under Opuntia polyacantha var. erinacea)
Synonym (tjm2)
Opuntia vaseyiNative
Opuntia whitneyana
(Under Opuntia basilaris var. basilaris)
Synonym
Opuntia wigginsii
(Under Cylindropuntia echinocarpa)
Synonym (tjm2)
Opuntia wolfii
(Under Cylindropuntia wolfii)
Synonym (tjm2)
Orchidaceae
  ↳  Key to Orchidaceae
ORCHID FAMILY
Orcuttia
  ↳  Key to Orcuttia
Orcuttia californicaCALIFORNIA ORCUTT GRASSNative
Orcuttia californica var. inaequalis
(Under Orcuttia inaequalis)
Synonym (tjm2)
Orcuttia californica var. viscida
(Under Orcuttia viscida)
Synonym (tjm2)
Orcuttia greenei
(Under Tuctoria greenei)
Synonym (tjm2)
Orcuttia inaequalisSAN JOAQUIN VALLEY ORCUTT GRASSNative
Orcuttia mucronata
(Under Tuctoria mucronata)
Synonym (tjm2)
Orcuttia pilosaHAIRY ORCUTT GRASSNative
Orcuttia tenuisSLENDER ORCUTT GRASSNative
Orcuttia viscidaSACRAMENTO ORCUTT GRASSNative
Oreobroma aridorum
(Under Lewisia pygmaea)
Synonym (tjm2)
Oreobroma brachycalyx
(Under Lewisia brachycalyx)
Synonym (tjm2)
Oreobroma congdonii
(Under Lewisia congdonii)
Synonym (tjm2)
Oreobroma exarticulatum
(Under Lewisia pygmaea)
Synonym (tjm2)
Oreobroma heckneri
(Under Lewisia cotyledon var. heckneri)
Synonym (tjm2)
Oreobroma howellii
(Under Lewisia cotyledon var. howellii)
Synonym (tjm2)
Oreobroma leeanum
(Under Lewisia leeana)
Synonym (tjm2)
Oreobroma longipetalum
(Under Lewisia longipetala)
Synonym (tjm2)
Oreobroma oppositifolium
(Under Lewisia oppositifolia)
Synonym (tjm2)
Oreobroma triphyllum
(Under Lewisia triphylla)
Synonym (tjm2)
Oreocarya alpicola
(Under Cryptantha humilis)
Synonym (tjm2)
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 vulgare
(Under Origanum)
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 (tjm2)
Ornithopus sativus subsp. sativus
(Under Ornithopus sativus)
Synonym (tjm2)
Ornithopus sativus var. macrorrhynchus
(Under Ornithopus sativus)
Synonym (tjm2)
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 (tjm2)
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 (tjm2)
Orobanche ludoviciana var. latiloba
(Under Orobanche cooperi)
Synonym (tjm2)
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 (tjm2)
Orthocarpus bidwelliae var. micranthus
(Under Triphysaria micrantha)
Synonym
Orthocarpus bracteosusNative
Orthocarpus brevistyla
(Under Castilleja brevistyla)
Synonym (tjm2)
Orthocarpus campestris
(Under Castilleja campestris)
Synonym
Orthocarpus campestris var. succulentus
(Under Castilleja campestris subsp. succulenta)
Synonym (tjm2)
Orthocarpus castillejoides
(Under Castilleja ambigua)
Synonym
Orthocarpus castillejoides var. humboldtiensis
(Under Castilleja ambigua subsp. humboldtiensis)
Synonym (tjm2)
Orthocarpus castillejoides var. insalutatus
(Under Castilleja ambigua subsp. insalutata)
Synonym (tjm2)
Orthocarpus copelandii
(Under Orthocarpus cuspidatus subsp. copelandii)
Synonym (tjm2)
Orthocarpus copelandii var. cryptanthus
(Under Orthocarpus cuspidatus subsp. cryptanthus)
Synonym (tjm2)
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 (tjm2)
Orthocarpus densiflorus subsp. gracilis
(Under Castilleja densiflora subsp. gracilis)
Synonym (tjm2)
Orthocarpus densiflorus var. gracilis
(Under Castilleja densiflora subsp. gracilis)
Synonym (tjm2)
Orthocarpus densiflorus var. obispoensis
(Under Castilleja densiflora subsp. obispoensis)
Synonym (tjm2)
Orthocarpus erianthus
(Under Triphysaria eriantha subsp. eriantha)
Synonym (tjm2)
Orthocarpus erianthus var. gratiosus
(Under Triphysaria eriantha subsp. eriantha)
Synonym (tjm2)
Orthocarpus erianthus var. micranthus
(Under Triphysaria micrantha)
Synonym
Orthocarpus erianthus var. roseus
(Under Triphysaria eriantha subsp. rosea)
Synonym (tjm2)
Orthocarpus faucibarbatus
(Under Triphysaria versicolor subsp. faucibarbata)
Synonym (tjm2)
Orthocarpus faucibarbatus subsp. albidus
(Under Triphysaria versicolor subsp. versicolor)
Synonym (tjm2)
Orthocarpus floribundus
(Under Triphysaria floribunda)
Synonym
Orthocarpus hispidus
(Under Castilleja tenuis)
Synonym (tjm2)
Orthocarpus imbricatusNative
Orthocarpus lacerus
(Under Castilleja lacera)
Synonym (tjm2)
Orthocarpus lasiorhynchus
(Under Castilleja lasiorhyncha)
Synonym (tjm2)
Orthocarpus linearilobus
(Under Castilleja lineariloba)
Synonym (tjm2)
Orthocarpus lithospermoides var. bicolor
(Under Castilleja rubicundula subsp. rubicundula)
Synonym (tjm2)
Orthocarpus lithospermoides var. lithospermoides
(Under Castilleja rubicundula subsp. lithospermoides)
Synonym (tjm2)
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 (tjm2)
Orthocarpus purpurascens var. latifolius
(Under Castilleja exserta subsp. latifolia)
Synonym (tjm2)
Orthocarpus purpurascens var. ornatus
(Under Castilleja exserta subsp. venusta)
Synonym (tjm2)
Orthocarpus purpurascens var. pallidus
(Under Castilleja exserta subsp. exserta)
Synonym (tjm2)
Orthocarpus pusillus
(Under Triphysaria pusilla)
Synonym (tjm2)
Orthocarpus versicolor var. roseus
(Under Triphysaria eriantha subsp. rosea)
Synonym (tjm2)
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 (tjm2)
Oryzopsis hymenoides
(Under Stipa hymenoides)
Synonym (tjm2)
Oryzopsis kingii
(Under Stipa kingii)
Synonym (tjm2)
Oryzopsis micrantha
(Under Stipa divaricata)
Synonym (tjm2)
Oryzopsis miliacea
(Under Stipa miliacea var. miliacea)
Synonym
Oryzopsis webberi
(Under Stipa webberi)
Synonym (tjm2)
Osmadenia
Osmadenia tenellaOSMADENIANative
Osmaronia cerasiformis
(Under Oemleria cerasiformis)
Synonym (tjm2)
Osmorhiza
  ↳  Key to Osmorhiza
SWEET-CICELY
Osmorhiza berteroiNative
Osmorhiza brachypodaNative
Osmorhiza chilensis
(Under Osmorhiza berteroi)
Synonym (tjm2)
Osmorhiza depauperataBLUNT-FRUITED SWEET-CICELYNative
Osmorhiza occidentalisNative
Osmorhiza purpureaNative
Osteospermum ecklonis
(Under Asteraceae)
Mentioned in
a note
Osteospermum ecklonis
(Under Dimorphotheca ecklonis)
Synonym (tjm2)
Osteospermum fruticosum
(Under Dimorphotheca fruticosa)
Synonym (tjm2)
Ottelia
Ottelia alismoidesExtirpated alien
Ourisia californica
(Under Hesperochiron californicus)
Synonym (tjm2)
OxalidaceaeOXALIS FAMILY
Oxalis
  ↳  Key to Oxalis
Oxalis albicans subsp. californica
(Under Oxalis californica)
Synonym (tjm2)
Oxalis albicans subsp. pilosa
(Under Oxalis pilosa)
Synonym (tjm2)
Oxalis articulata subsp. rubraWINDOWBOX WOOD-SORRELNaturalized
Oxalis bowieiBOWIE'S WOOD-SORRELWaif
Oxalis californicaCALIFORNIA WOOD-SORRELNative
Oxalis cernua
(Under Oxalis pes-caprae)
Synonym (tjm2)
Oxalis corniculataNaturalized
Oxalis corniculata subsp. pilosa
(Under Oxalis pilosa)
Synonym (tjm2)
Oxalis corniculata var. wrightii
(Under Oxalis pilosa)
Synonym (tjm2)
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 (tjm2)
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 (tjm2)
Oxalis suksdorfiiSUKSDORF'S WOOD-SORRELNative
Oxalis trilliifoliaNative
Oxybaphus coccineus
(Under Mirabilis coccinea)
Synonym (tjm2)
Oxybaphus laevis
(Under Mirabilis laevis)
Synonym
Oxypolis
Oxypolis occidentalisNative
OxyriaMOUNTAIN SORREL
Oxyria digynaNative
Oxystylis
Oxystylis luteaNative
Oxytenia acerosa
(Under Euphrosyne acerosa)
Synonym (tjm2)
Oxytheca
  ↳  Key to Oxytheca
Oxytheca abramsii
(Under Acanthoscyphus parishii var. abramsii)
Synonym (tjm2)
Oxytheca caryophylloides
(Under Sidotheca caryophylloides)
Synonym (tjm2)
Oxytheca dendroidea subsp. dendroideaTREE-LIKE PUNCTUREBRACTNative
Oxytheca dendroidea var. foliosa
(Under Oxytheca dendroidea subsp. dendroidea)
Synonym (tjm2)
Oxytheca dendroidea var. hillmanii
(Under Oxytheca dendroidea subsp. dendroidea)
Synonym (tjm2)
Oxytheca emarginata
(Under Sidotheca emarginata)
Synonym (tjm2)
Oxytheca foliosa
(Under Oxytheca dendroidea subsp. dendroidea)
Synonym (tjm2)
Oxytheca glandulosa
(Under Eriogonum glandulosum)
Synonym (tjm2)
Oxytheca hirtiflora
(Under Eriogonum hirtiflorum)
Synonym (tjm2)
Oxytheca inermis
(Under Eriogonum inerme var. inerme)
Synonym (tjm2)
Oxytheca insignis
(Under Aristocapsa insignis)
Synonym (tjm2)
Oxytheca luteola
(Under Goodmania luteola)
Synonym (tjm2)
Oxytheca parishii
(Under Acanthoscyphus parishii)
Synonym (tjm2)
Oxytheca parishii subsp. abramsii
(Under Acanthoscyphus parishii var. abramsii)
Synonym (tjm2)
Oxytheca parishii var. abramsii
(Under Acanthoscyphus parishii var. abramsii)
Synonym (tjm2)
Oxytheca parishii var. cienegensis
(Under Acanthoscyphus parishii var. cienegensis)
Synonym (tjm2)
Oxytheca parishii var. goodmaniana
(Under Acanthoscyphus parishii var. goodmaniana)
Synonym (tjm2)
Oxytheca parishii var. parishii
(Under Acanthoscyphus parishii var. parishii)
Synonym (tjm2)
Oxytheca perfoliataROUND-LEAF PUNCTUREBRACTNative
Oxytheca reddingiana
(Under Eriogonum spergulinum var. reddingianum)
Synonym (tjm2)
Oxytheca spergulina
(Under Eriogonum spergulinum var. spergulinum)
Synonym (tjm2)
Oxytheca trilobata
(Under Sidotheca trilobata)
Synonym (tjm2)
Oxytheca watsoniiWATSON'S OXYTHECANative
Oxytheca watsonii
(Under Acanthoscyphus parishii var. goodmaniana)
Synonym (tjm2)
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 (tjm2)
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 (tjm2)
Ozomelis
  ↳  Key to Ozomelis
Ozomelis diversifoliaNative
Ozomelis trifidaNative