Plants beginning with O
155 plants
- Orobanche uniflora
- Orogenia linearifoliaIndian Potato
- Orontium aquaticumGolden Club
- Orostachys japonicaRock Pine
- Orthilia secundaSidebells Wintergreen
- Orychophragmus violaceus
- Oryzopsis asperifoliaMountain Rice
- Osbeckia chinensis
- Osmanthus americana
- Osmanthus decorus
- Osmanthus delavayi
- Osmanthus fragransFragrant Olive
- Osmanthus heterophyllusHolly Olive
- Osmanthus x burkwoodii
- Osmorhiza aristata
- Osmorhiza chilensis
- Osmorhiza claytoniiWoolly Sweet-Cicely
- Osmorhiza longistylisAniseroot
- Osmorhiza obtusa
- Osmorhiza occidentalisWestern Sweet-Cicely
- Osmunda asiatica
- Osmunda cinnamomeaCinnamon Fern
- Osmunda claytonianaInterrupted Fern
- Osmunda japonicaZenmai
- Osmunda regalisRoyal Fern
- Osteomeles obtusifolia
- Osteomeles schwerinae
- Osteomeles subrotunda
- Ostrya carpinifoliaHop Hornbeam
- Ostrya virginianaIronwood
- Oxalis acetosellaWood Sorrel
- Oxalis adenophyllaSauer Klee
- Oxalis articulataPink Sorrel
- Oxalis barrelieri
- Oxalis bifida
- Oxalis corniculataYellow Sorrel
- Oxalis corymbosaLilac Oxalis
- Oxalis deppeiIron Cross Plant
- Oxalis enneaphyllaScurvy Grass
- Oxalis europaea
- Oxalis exilisLeast Yellow Sorrel
- Oxalis frutescens
- Oxalis lasiandra
- Oxalis magellanica
- Oxalis montanaMountain Wood Sorrel
- Oxalis oreganaRedwood Sorrel
- Oxalis pes-capraeBermuda Buttercup
- Oxalis strictaYellow Wood Sorrel
- Oxalis tetraphylla
- Oxalis triangularis
- Oxalis tuberosaOca
- Oxalis violaceaViolet Wood Sorrel
- Oxydendrum arboreumSorrel Tree
- Oxyria digynaMountain Sorrel
- Oxytropis lambertiiCrazy Weed