Luokka Kasvitiedebulgariaenglantiespanjaesperantohollantiitaliajapanikreikkalatinalatvialiettuanorjaportugalipuolaranskaruotsisaksasuomitanskaturkkitšekkiunkarivenäjäviro

obreniform obsagittate obtrullate obtuse obverse obvolute ochrea ochreate ocrea octofid octogynous octostichous odd-pinnate offset oil radish oilseed radish oleander oligandrous oliganthous oligopetalous oligospermous ombrophile omphalode onagraceous oncidium onopordum oogonium oophoric oophoridium oosphere oosporangium ophioglossid oppositifolious oppositipetalous

oppositisepalous orchidaceous orchidean orchidology Oriental radish ornithophilous orpin orthodox orthogamous orthogamy orthospermous orthostichy orthotropic orthotropous orval osmunda osmundine ostiole ovary ovate ovule ovulum oxalidaceous pacay pachyphyllous pachysandra packet pagina palaeodicot palate palea paleaceous paleate

paleobotanist paleobotany paleodicot paleoherb paleola palmaceous palmate palmately compound palmatifid palmatilobed palmatipartite palmatisect palmatisected palminerved pandurate panduriform panic panicgrass panicle panicled paniculated pannose papaver paphiopedilum papilionaceous papillose pappiform pappose pappous pappus papulose paracorolla parallelinerved