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Lotus arenarius

Hosackia oblongifolia

Streambank deer-vetch

Lotus peregrinus var. carmeli

Nuphar × interfluitans

Nuphar ovata

Nymphaea lotus

Egyptian lotus

Ochrosia elliptica

Pokosola

Odontonema tubiforme

Oenothera arizonica

Oenothera caespitosa subsp. navajoensis

Oenothera pilosella subsp. pilosella

Omphalodes verna

Creeping-forget-me-not

Ononis biflora

Ophioglossum crotalophoroides

Bulbous adderstongue

Ophioderma pendula

Oplonia microphylla

Oxalis illinoensis

Oxalis nelsonii

Oxalis oregana var. smallii

Oxypolis ternata