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Siskiyou Mountains Orthocarpus
Orthocarpus cuspidatus ssp. cuspidatus
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Mountain Owl’s-clover
Orthocarpus imbricatus
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Yellow Owl’s Clover
Orthocarpus luteus
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Shasta Orthocarpus
Orthocarpus pachystachyus
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Nevada Oryctes
Oryctes nevadensis
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Osmadenia
Osmadenia tenella
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Sweet Cicely
Osmorhiza berteroi
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California Sweetcicely
Osmorhiza brachypoda
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Bluntseed Sweetroot
Osmorhiza depauperata
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Mountain Sweet Cicely
Osmorhiza occidentalis
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Purple Sweetroot
Osmorhiza purpurea
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California Wood-sorrel
Oxalis californica
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Redwood Sorrel
Oxalis oregana
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Klamath Ruby Redwood Sorrel
Oxalis oregana ‘Klamath Ruby’
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Smith River Redwood Sorrel
Oxalis oregana ‘Smith River’
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Radishroot Woodsorrel
Oxalis pilosa
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Suksdorf’s Wood-sorrel
Oxalis suksdorfii
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Threeleaf Woodsorrel
Oxalis trilliifolia
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Western Cowbane
Oxypolis occidentalis
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Mountain Sorrel
Oxyria digyna
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Narrowleaf Oxytheca
Oxytheca dendroidea
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Tree-like Puncturebract
Oxytheca dendroidea ssp. dendroidea
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Roundleaf Puncturebract
Oxytheca perfoliata
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Watson’s Oxytheca
Oxytheca watsonii
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Boreal Locoweed
Oxytropis borealis
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Boreal Locoweed
Oxytropis borealis var. australis
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Viscid Locoweed
Oxytropis borealis var. viscida
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Blue Nodding Locoweed
Oxytropis deflexa