Plants beginning with O
155 plants
- Ocimum basilicumSweet Basil
- Ocimum minimumBush Basil
- Oemleria cerasiformisOso Berry
- Oenanthe aquaticaWater Dropwort
- Oenanthe javanicaWater Dropwort
- Oenanthe peucidanifolia
- Oenanthe pimpinelloidesMeadow Parsley
- Oenanthe sarmentosaWater Dropwort
- Oenothera albicaulisWhitest Evening Primrose
- Oenothera biennisEvening Primrose
- Oenothera brevipesGolden Suncup
- Oenothera elata hookeriHooker's Evening Primrose
- Oenothera glaziovianaLarge-Flower Evening Primrose
- Oenothera lamarckiana
- Oenothera odorata
- Oldenlandia diffusaSnake-Needle Grass
- Olea europaeaOlive
- Olearia avicenniifoliaAkeake
- Olearia ilicifolia
- Olearia macrodonta
- Olearia paniculata
- Olearia solandri
- Olearia traversii
- Olearia virgata
- Olearia x haastii
- Olneya tesota
- Onobrychis viciifoliaSainfoin
- Onoclea sensibilisSensitive Fern
- Ononis repensRest Harrow
- Ononis spinosaSpiny Rest Harrow
- Onopordum acanthiumScotch Thistle
- Onopordum illyricumCotton Thistle
- Onosma bracteatum
- Onosma echioides
- Onosma frutescens
- Onosma hispidum
- Ophioglossum vulgatumAdder's Tongue
- Ophiopogon japonicusSnake's Beard
- Ophrys apiferaBee Orchid
- Ophrys araneola
- Ophrys bertolonii
- Ophrys bombyliflora
- Ophrys fuscaBrown Bee Orchid
- Ophrys holosericaLate Spider Orchid
- Ophrys insectiferaFly Orchid
- Ophrys iricolor
- Ophrys luteaYellow Bee Orchid
- Ophrys scolopaxWoodcock Orchid
- Ophrys sphegodesEarly Spider Orchid
- Ophrys tenthrediniferaSawfly Orchid
- Ophrys vernixia
- Oplopanax horridusDevil's Club
- Oplopanax japonicus
- Opopanax chironiumOpopanax
- Opuntia compressaEastern Prickly Pear
- Opuntia erinaceaMojave Prickly Pear
- Opuntia ficus-indicaPrickly Pear
- Opuntia fragilisPrickly Pear
- Opuntia howeyi
- Opuntia imbricataTree Chola
- Opuntia littoralisWestern Prickly Pear
- Opuntia macrorhizaTwist-Spine Prickly Pear
- Opuntia microdasysBunny Ears
- Opuntia phaeacanthaBastard Fig
- Opuntia polyacanthaPlains Prickly Pear
- Opuntia ramosissimaBranched Pencil Cholla
- Orchis coriophoraBug Orchis
- Orchis italica
- Orchis laxifloraMarsh Orchis
- Orchis masculaEarly Purple Orchis
- Orchis militarisMilitary Orchis
- Orchis morioGreen-Winged Orchid
- Orchis ustulataDark-Winged Orchis
- Oreomyrrhis hookeri
- Origanum compactum
- Origanum dictamnusDittany Of Crete
- Origanum glandulosum
- Origanum isthmicum
- Origanum majoranaSweet Marjoram
- Origanum onitesPot Marjoram
- Origanum syriacumBible Hyssop
- Origanum virens
- Origanum vulgareOregano
- Origanum vulgare hirtumGreek Oregano
- Origanum x hybridum
- Origanum x majoricumHardy Marjoram
- Orixa japonica
- Ornithogalum narbonenseStar Of Bethlehem
- Ornithogalum pyrenaicumBath Asparagus
- Ornithogalum umbellatumStar Of Bethlehem
- Ornithopus sativusSerradella
- Orobanche ammophylaLie Dang
- Orobanche californicaCalifornia Broomrape
- Orobanche cernua
- Orobanche fasciculataCancer Root
- Orobanche grayana
- Orobanche ludovicianaBroom Rape
- Orobanche minorLesser Broomrape
- Orobanche pinorum
- Orobanche tuberosaGround Cone