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Orthotrichum pallens var. johnsenae

Orthotrichum schimperi

Orthotrichum blyttii

Orthotrichum speciosum var. elegans

Osmanthus × fortunei

Osmoxylon pachyphyllum

Osteomeles schweriniae

Otholobium fruticans

Osmorhiza depauperata

Lesser sweet-cicely

Osmorhiza longistylis

Smooth sweet cicely

Osteomeles anthyllidifolia

Hawai'i hawthorn

Osmorhiza mexicana

Ouratea littoralis

Oxalis corniculata var. corniculata

Oxalis corniculata var. minor

Ouratea striata

Oxalis articulata

Shamrock oxalis

Oxalis barrelieri

Barrelier's woodsorrel

Oxalis bowiei

Red-flower woodsorrel

Oxalis decaphylla

Tenleaf woodsorrel