List of Plants Beginning With Letter “O”
Flowers Vegetables Fruits Trees Herbs
- oak
- oak tree
- oakleaf goosefoot
- oat
- obeche
- obechi
- obedience plant
- obedient plant
- oblanceolate leaf
- oblong leaf
- oblong woodsia
- obovate leaf
- obtuse leaf
- oca
- ochna
- ochna family
- ochna serrulata
- ochnaceae
- ochroma
- ochroma lagopus
- ocimum
- ocimum basilicum
- oconee bells
- ocotillo
- odontoglossum
- oenanthe
- oenanthe aquatica
- oenanthe crocata
- oenothera
- oenothera biennis
- oenothera fruticosa
- oenothera macrocarpa
- offset
- ohio buckeye
- ohio goldenrod
- oil nut
- oil palm
- oilseed
- oka
- okra
- okra plant
- old growth
- old maid
- old maid flower
- old man of the mountain
- old witch grass
- old witchgrass
- old world hop hornbeam
- old world mistletoe
- old world yew
- olea
- olea cunninghamii
- olea europaea
- olea lanceolata
- oleaceae
- oleales
- oleander
- oleander fern
- oleandra
- oleandra mollis
- oleandra neriiformis
- oleandraceae
- olearia
- olearia argophylla
- olearia haastii
- oleaster
- oleaster family
- olfersia
- olfersia cervina
- oligoporus
- oligoporus leucospongia
- olive
- olive family
- olive tree
- ombu
- omphalotus
- omphalotus illudens
- onagraceae
- oncidium
- oncidium papilio
- onion
- onion mildew
- onion plant
- onion smut
- onion stem
- onobrychis
- onobrychis viciaefolia
- onobrychis viciifolia
- onoclea
- onoclea sensibilis
- onoclea struthiopteris
- ononis
- ononis repens
- ononis spinosa
- onopordon
- onopordon acanthium
- onopordum
- onopordum acanthium
- onosmodium
- onychium
- oomycetes
- oosphere
- opepe
- ophioglossaceae
- ophioglossales
- ophioglossum
- ophioglossum pendulum
- ophrys
- ophrys apifera
- ophrys insectifera
- ophrys muscifera
- ophrys sphegodes
- opium poppy
- opossum wood
- opuntia
- opuntia cholla
- opuntia lindheimeri
- opuntia tuna
- opuntiales
- orach
- orache
- orange
- orange balsam
- orange daisy
- orange fleabane
- orange grass
- orange hawkweed
- orange milkweed
- orange milkwort
- orange mushroom pimple
- orange peel fungus
- orange sneezeweed
- orange tree
- orangewood
- orbiculate leaf
- orbignya
- orbignya cohune
- orbignya martiana
- orbignya phalerata
- orbignya spesiosa
- orchard apple tree
- orchard grass
- orchid
- orchid cactus
- orchid family
- orchid tree
- orchidaceae
- orchidaceous plant
- orchidales
- orchil
- orchis
- orchis mascula
- orchis papilionaceae
- orchis spectabilis
- ordeal bean
- ordeal tree
- order agaricales
- order alismales
- order andreaeales
- order anthocerotales
- order aphyllophorales
- order arales
- order aristolochiales
- order aspergillales
- order auriculariales
- order bennettitales
- order blastocladiales
- order bryales
- order campanulales
- order caryophyllales
- order casuarinales
- order chytridiales
- order commelinales
- order coniferales
- order cordaitales
- order cycadales
- order cycadofilicales
- order diapensiales
- order dicranales
- order ebenales
- order endomycetales
- order entomophthorales
- order equisetales
- order ericales
- order erysiphales
- order eubryales
- order eurotiales
- order fagales
- order filicales
- order gentianales
- order geraniales
- order ginkgoales
- order gnetales
- order graminales
- order guttiferales
- order helotiales
- order hymenogastrales
- order hypericales
- order hypocreales
- order isoetales
- order juglandales
- order jungermanniales
- order lechanorales
- order lepidodendrales
- order lichenales
- order liliales
- order lycoperdales
- order lycopodiales
- order lyginopteridales
- order malvales
- order marattiales
- order marchantiales
- order moniliales
- order mucorales
- order musales
- order mycelia sterilia
- order myricales
- order myrtales
- order naiadales
- order nidulariales
- order oleales
- order ophioglossales
- order opuntiales
- order orchidales
- order palmales
- order pandanales
- order papaverales
- order parietales
- order peronosporales
- order pezizales
- order phallales
- order piperales
- order plantaginales
- order plumbaginales
- order polemoniales
- order polygonales
- order polypodiales
- order primulales
- order proteales
- order psilophytales
- order psilotales
- order ranales
- order ranunculales
- order rhamnales
- order rhoeadales
- order rosales
- order rubiales
- order salicales
- order santalales
- order sapindales
- order saprolegniales
- order sarraceniales
- order sclerodermatales
- order scrophulariales
- order secotiales
- order selaginellales
- order sphaeriales
- order sphaerocarpales
- order sphagnales
- order taxales
- order thymelaeales
- order tremellales
- order tuberales
- order tulostomatales
- order umbellales
- order uredinales
- order urticales
- order ustilaginales
- order xyridales
- oregano
- oregon alder
- oregon ash
- oregon cedar
- oregon crab apple
- oregon fir
- oregon grape
- oregon holly grape
- oregon larch
- oregon lily
- oregon maple
- oregon myrtle
- oregon oak
- oregon pine
- oregon white oak
- oreopteris
- oreopteris limbosperma
- oriental arborvitae
- oriental bittersweet
- oriental black mushroom
- oriental bush cherry
- oriental cherry
- oriental garlic
- oriental plane
- oriental poppy
- oriental spruce
- origanum
- origanum dictamnus
- origanum majorana
- origanum vulgare
- orites
- orites excelsa
- ormosia
- ormosia coarctata
- ormosia monosperma
- ornamental
- ornithogalum
- ornithogalum pyrenaicum
- ornithogalum thyrsoides
- ornithogalum umbellatum
- orobanchaceae
- orontium
- orontium aquaticum
- orpin
- orpine
- orris
- orrisroot
- orthilia
- orthotropous ovule
- oryza
- oryza sativa
- oryzopsis
- oryzopsis hymenoides
- oryzopsis miliacea
- osage orange
- osier
- osmanthus
- osmanthus americanus
- osmund
- osmunda cinnamonea
- osmunda clatonia
- osmunda regalis
- osmundaceae
- ostiole
- ostrich fern
- ostrya
- ostrya carpinifolia
- ostrya virginiana
- ostryopsis
- oswego tea
- othonna
- oval kumquat
- ovary
- ovate leaf
- overcup oak
- ovule
- owlclaws
- oxalidaceae
- oxalis
- oxalis acetosella
- oxalis caprina
- oxalis cernua
- oxalis corniculata
- oxalis crenata
- oxalis tuberosa
- oxalis violacea
- oxandra
- oxandra lanceolata
- oxeye
- oxeye daisy
- oxheart
- oxlip
- oxtongue
- oxydendrum
- oxydendrum arboreum
- oxytropis
- oxytropis lambertii
- oyster agaric
- oyster fungus
- oyster mushroom
- oyster plant
- ozark chinkapin
- ozark chinquapin
- ozark sundrops
- ozonium
- ozothamnus
