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Ottochloa nodosa

Oxalis acetosella

Irish shamrock

Oxalis oregana

Redwood-sorrel

Oxalis rosea

Sorrel

Oxalis trilliifolia

Threeleaf woodsorrel

Oxydendrum arboreum

Sourwood

Oxypetalum coeruleum

Southern star

Oxyria digyna

Alpine mountain-sorrel

Oxalis spiralis

Spiral sorrel

Oxytropis campestris

Field locoweed

Oxylobium ellipticum

Oxypetalum cordifolium

Oxytropis deflexa

Blue pendent-pod oxytrope

Oxytropis lambertii

Purple locoweed

Oxytropis splendens

Showy locoweed

Pachysandra procumbens

Mountain-spurge

Pachystachys lutea

Golden shrimp-plant

Packera aurea

Packera anonyma

Packera clevelandii