Plants that Start with O


Starting with OA
  1. oak
  2. oak tree
  3. oakleaf goosefoot
  4. oat

Starting with OB
  1. obeche
  2. obechi
  3. obedience plant
  4. obedient plant
  5. oblanceolate leaf
  6. oblong leaf
  7. oblong woodsia
  8. obovate leaf
  9. obtuse leaf

Starting with OC
  1. oca
  2. ochna
  3. ochna family
  4. ochna serrulata
  5. ochnaceae
  6. ochroma
  7. ochroma lagopus
  8. ocimum
  9. ocimum basilicum
  10. oconee bells
  11. ocotillo

Starting with OD
  1. odontoglossum

Starting with OE
  1. oenanthe
  2. oenanthe aquatica
  3. oenanthe crocata
  4. oenothera
  5. oenothera biennis
  6. oenothera fruticosa
  7. oenothera macrocarpa

Starting with OF
  1. offset

Starting with OH
  1. ohio buckeye
  2. ohio goldenrod

Starting with OI
  1. oil nut
  2. oil palm
  3. oilseed

Starting with OK
  1. oka
  2. okra
  3. okra plant



Starting with OL
  1. old growth
  2. old maid
  3. old maid flower
  4. old man of the mountain
  5. old witch grass
  6. old witchgrass
  7. old world hop hornbeam
  8. old world mistletoe
  9. old world yew
  10. olea
  11. olea cunninghamii
  12. olea europaea
  13. olea lanceolata
  14. oleaceae
  15. oleales
  16. oleander
  17. oleander fern
  18. oleandra
  19. oleandra mollis
  20. oleandra neriiformis
  21. oleandraceae
  22. olearia
  23. olearia argophylla
  24. olearia haastii
  25. oleaster
  26. oleaster family
  27. olfersia
  28. olfersia cervina
  29. oligoporus
  30. oligoporus leucospongia
  31. olive
  32. olive family
  33. olive tree

Starting with OM
  1. ombu
  2. omphalotus
  3. omphalotus illudens

Starting with ON
  1. onagraceae
  2. oncidium
  3. oncidium papilio
  4. onion
  5. onion mildew
  6. onion plant
  7. onion smut
  8. onion stem
  9. onobrychis
  10. onobrychis viciaefolia
  11. onobrychis viciifolia
  12. onoclea
  13. onoclea sensibilis
  14. onoclea struthiopteris
  15. ononis
  16. ononis repens
  17. ononis spinosa
  18. onopordon
  19. onopordon acanthium
  20. onopordum
  21. onopordum acanthium
  22. onosmodium
  23. onychium

Starting with OO
  1. oomycetes
  2. oosphere

Starting with OP
  1. opepe
  2. ophioglossaceae
  3. ophioglossales
  4. ophioglossum
  5. ophioglossum pendulum
  6. ophrys
  7. ophrys apifera
  8. ophrys insectifera
  9. ophrys muscifera
  10. ophrys sphegodes
  11. opium poppy
  12. opossum wood
  13. opuntia
  14. opuntia cholla
  15. opuntia lindheimeri
  16. opuntia tuna
  17. opuntiales

Starting with OR
  1. orach
  2. orache
  3. orange
  4. orange balsam
  5. orange daisy
  6. orange fleabane
  7. orange grass
  8. orange hawkweed
  9. orange milkweed
  10. orange milkwort
  11. orange mushroom pimple
  12. orange peel fungus
  13. orange sneezeweed
  14. orange tree
  15. orangewood
  16. orbiculate leaf
  17. orbignya
  18. orbignya cohune
  19. orbignya martiana
  20. orbignya phalerata
  21. orbignya spesiosa
  22. orchard apple tree
  23. orchard grass
  24. orchid
  25. orchid cactus
  26. orchid family
  27. orchid tree
  28. orchidaceae
  29. orchidaceous plant
  30. orchidales
  31. orchil
  32. orchis
  33. orchis mascula
  34. orchis papilionaceae
  35. orchis spectabilis
  36. ordeal bean
  37. ordeal tree
  38. order agaricales
  39. order alismales
  40. order andreaeales
  41. order anthocerotales
  42. order aphyllophorales
  43. order arales
  44. order aristolochiales
  45. order aspergillales
  46. order auriculariales
  47. order bennettitales
  48. order blastocladiales
  49. order bryales
  50. order campanulales
  51. order caryophyllales
  52. order casuarinales
  53. order chytridiales
  54. order commelinales
  55. order coniferales
  56. order cordaitales
  57. order cycadales
  58. order cycadofilicales
  59. order diapensiales
  60. order dicranales
  61. order ebenales
  62. order endomycetales
  63. order entomophthorales
  64. order equisetales
  65. order ericales
  66. order erysiphales
  67. order eubryales
  68. order eurotiales
  69. order fagales
  70. order filicales
  71. order gentianales
  72. order geraniales
  73. order ginkgoales
  74. order gnetales
  75. order graminales
  76. order guttiferales
  77. order helotiales
  78. order hymenogastrales
  79. order hypericales
  80. order hypocreales
  81. order isoetales
  82. order juglandales
  83. order jungermanniales
  84. order lechanorales
  85. order lepidodendrales
  86. order lichenales
  87. order liliales
  88. order lycoperdales
  89. order lycopodiales
  90. order lyginopteridales
  91. order malvales
  92. order marattiales
  93. order marchantiales
  94. order moniliales
  95. order mucorales
  96. order musales
  97. order mycelia sterilia
  98. order myricales
  99. order myrtales
  100. order naiadales
  101. order nidulariales
  102. order oleales
  103. order ophioglossales
  104. order opuntiales
  105. order orchidales
  106. order palmales
  107. order pandanales
  108. order papaverales
  109. order parietales
  110. order peronosporales
  111. order pezizales
  112. order phallales
  113. order piperales
  114. order plantaginales
  115. order plumbaginales
  116. order polemoniales
  117. order polygonales
  118. order polypodiales
  119. order primulales
  120. order proteales
  121. order psilophytales
  122. order psilotales
  123. order ranales
  124. order ranunculales
  125. order rhamnales
  126. order rhoeadales
  127. order rosales
  128. order rubiales
  129. order salicales
  130. order santalales
  131. order sapindales
  132. order saprolegniales
  133. order sarraceniales
  134. order sclerodermatales
  135. order scrophulariales
  136. order secotiales
  137. order selaginellales
  138. order sphaeriales
  139. order sphaerocarpales
  140. order sphagnales
  141. order taxales
  142. order thymelaeales
  143. order tremellales
  144. order tuberales
  145. order tulostomatales
  146. order umbellales
  147. order uredinales
  148. order urticales
  149. order ustilaginales
  150. order xyridales
  151. oregano
  152. oregon alder
  153. oregon ash
  154. oregon cedar
  155. oregon crab apple
  156. oregon fir
  157. oregon grape
  158. oregon holly grape
  159. oregon larch
  160. oregon lily
  161. oregon maple
  162. oregon myrtle
  163. oregon oak
  164. oregon pine
  165. oregon white oak
  166. oreopteris
  167. oreopteris limbosperma
  168. oriental arborvitae
  169. oriental bittersweet
  170. oriental black mushroom
  171. oriental bush cherry
  172. oriental cherry
  173. oriental garlic
  174. oriental plane
  175. oriental poppy
  176. oriental spruce
  177. origanum
  178. origanum dictamnus
  179. origanum majorana
  180. origanum vulgare
  181. orites
  182. orites excelsa
  183. ormosia
  184. ormosia coarctata
  185. ormosia monosperma
  186. ornamental
  187. ornithogalum
  188. ornithogalum pyrenaicum
  189. ornithogalum thyrsoides
  190. ornithogalum umbellatum
  191. orobanchaceae
  192. orontium
  193. orontium aquaticum
  194. orpin
  195. orpine
  196. orris
  197. orrisroot
  198. orthilia
  199. orthotropous ovule
  200. oryza
  201. oryza sativa
  202. oryzopsis
  203. oryzopsis hymenoides
  204. oryzopsis miliacea



Starting with OS
  1. osage orange
  2. osier
  3. osmanthus
  4. osmanthus americanus
  5. osmund
  6. osmunda cinnamonea
  7. osmunda clatonia
  8. osmunda regalis
  9. osmundaceae
  10. ostiole
  11. ostrich fern
  12. ostrya
  13. ostrya carpinifolia
  14. ostrya virginiana
  15. ostryopsis
  16. oswego tea

Starting with OT
  1. othonna

Starting with OV
  1. oval kumquat
  2. ovary
  3. ovate leaf
  4. overcup oak
  5. ovule

Starting with OW
  1. owlclaws

Starting with OX
  1. oxalidaceae
  2. oxalis
  3. oxalis acetosella
  4. oxalis caprina
  5. oxalis cernua
  6. oxalis corniculata
  7. oxalis crenata
  8. oxalis tuberosa
  9. oxalis violacea
  10. oxandra
  11. oxandra lanceolata
  12. oxeye
  13. oxeye daisy
  14. oxheart
  15. oxlip
  16. oxtongue
  17. oxydendrum
  18. oxydendrum arboreum
  19. oxytropis
  20. oxytropis lambertii

Starting with OY
  1. oyster agaric
  2. oyster fungus
  3. oyster mushroom
  4. oyster plant

Starting with OZ
  1. ozark chinkapin
  2. ozark chinquapin
  3. ozark sundrops
  4. ozonium
  5. ozothamnus



Plants that Start with O

Our planet is very rich in flora species. There are millions of species that we can’t even imagine. Most of the names in this list are scientific names for the species. All of them start with the letter O.

 

Herbs that start with O

 

Ocimum: basil.

– The ocimum or basil is used for making pesto.

 

Old maid: commonly cultivated Old World woody herb having large pinkish to red flowers. Any of various plants of the genus Zinnia cultivated for their variously and brightly colored flower heads.

– The  old maid herb grows bright pink flowers and it’s found in Madasgacar.

 

Onobrychis: genus of Old World herbs having pinnate leaves and pink or whites racemose flowers followed by flat unjointed pods.

– The onobrychis grows between rocks in the white mountains of Greece.

 

Opium poppy: southwestern Asian herb with greyish leaves and white or reddish flowers; source of opium.

Opium poppy flowers resemble to red tulips. They are very beautiful flowers/

 

Flowers that start with O

 

Obedience plant: white-flowered West Indian plant whose root yields arrowroot starch.

– The flowers of the obedience plant can be arranged to look like natural bouquets.

 

Oenothera fructiosa: a day-flowering biennial or perennial of the genus Oenothera.

– The oenothera fructiosa belongs to the evening primerose family.

 

Oleander: an ornamental but poisonous flowering shrub having narrow evergreen leaves and clusters of fragrant white to pink or red flowers: native to East Indies but widely cultivated in warm regions.

Do you know that the oleander is one of the most poisonous plants on Earth?

 

Ononis repens: European woody plant having pink flowers and unifoliate leaves and long tough roots; spreads by underground runners.

– The ononis repens grows near the shores.

 

Ophrys: a hardy genus of terrestrial orchids of Europe and northern Africa and western Asia.

– If you look carefully you will notice it is an ophrys and not an insect as we think.

 

Orchid: any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors.

Beautiful orchids Bloom in the National Park; pink, white, orange, and purple orchids everywhere.

 

Trees that start with O

 

Oak: a deciduous tree of the genus Quercus; has acorns and lobed leaves. The hard durable wood of any oak; used especially for furniture and flooring.

– The old oak tree shared its branches with the sparrow.

 

Obeche: large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood.
The wood of an African obeche tree; used especially for veneering.

– The obeche is a strong and heavy wood. It’s timber has knots.

 

Ochroma: one species: balsa.

-The leaves of the ochroma tree are very large. They look like giant plant leaves.

 

Olea: evergreen trees and shrubs having oily one-seeded fruits.

– The courtyard was surrounded by olea trees.

 

Ombu: fast-growing herbaceous evergreen tree of South America having a broad trunk with high water content and dark green oval leaves.

– The roots of the ombu tree don’t grow underground, they are visible.

 

Jungle and swamps that start with O

 

Oenanthe aquatica: poisonous herbs: water dropworts.

– The oenanthe grow in wet mud and grow little flowers.

 

Orange mushroom pimple: a variety of mushroom pimple.

– The orange mushroom pimple is a fungus that attacks other mushrooms species, making them turning orange.

 

Order alismales: an order of aquatic monocotyledonous herbaceous plants.

– Almost all of the 4,500 order alismales species are aquatic.

 

Order Isoetales:aquatic or marsh-growing fern allies; known to have existed since the Cenozoic; sometimes included in Lycopodiales.

– The order isoetales looks like grass growing underwater.

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