Scientific name: Ocimum basilicum [Family: Lamiaceae]
Synonym: O. americanum
Common name: Sweet Basil
Chinese name: 九层塔 , 罗勒 , 鱼香菜
Location: Singapore
Date taken: 13 December 2008
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HYBRID/CULTIVAR

Scientific name: Ocimum gratissimum [Family: Lamiaceae]
Common name: East Indies Basil, Clove Basil, Tree Basil
Location: Singapore
Date taken: 25 April 2009
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Scientific name: Ocimum tenuiflorum [Family: Lamiaceae]
Synonym: O. sanctum
Common name: Holy Basil
Location: Singapore
Date taken: 13 December 2008
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HYBRID/CULTIVAR

Scientific name: Odontadenia macrantha [Family: Apocynaceae]
Synonym: O. grandiflora, O. speciosa, Echites macranthus
Common name: -
Chinese name: 巴西喇叭藤
Location: Singapore
Date taken: 30 October 2011
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Scientific name: Odontonema nitidum [Family: Acanthaceae]
Synonym: Justicia nitida, Thyrsacanthus nitidus
Common name: Shrubby Toothedthread
Location: Malaysia
Date taken: 2 June 2007
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Scientific name: Odontonema tubaeforme [Family: Acanthaceae]
Synonym: S. strictum, Thyrsacanthus strictus, Justicia coccinea, Justicia tubaeformis
Common name: Firespike, Cardinal Guard, Scarlet Flame
Chinese name: 红楼花 , 红筒花
Location: Singapore
Date taken: 2 January 2009
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Scientific name: Oldenlandia biflora [Family: Rubiaceae]
Synonym: O. paniculata, Hedyotis biflora
Common name: Twoflower Mille Graines
Chinese name: 双花耳草
Location: Singapore
Date taken: 5 November 2011
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Scientific name: Oldenlandia corymbosa [Family: Rubiaceae]
Synonym: Hedyotis corymbosa
Common name: Two-flowered Oldenlandia, Flat-top Mille Graines
Chinese name: 水线草 , 伞房花耳草 , 蛇舌草
Location: Singapore
Date taken: 6 September 2008
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Scientific name: Oldenlandia cristata [Family: Rubiaceae]
Synonym: Hedyotis congesta, Hedyotis philippensis, Hedyotis laevigata, Hedyotis prostrata, Knoxia corymbosa, Metabolus laevigatus, Metabolus prostrates, Spermacoce philippensis
Common name: -
Location: Singapore
Date taken: 17 January 2009
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Scientific name: Oncidium sphacelatum [Family: Orchidaceae]
Common name: Golden Shower
Location: Singapore
Date taken: 14 February 2010
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Scientific name: Oncosperma tigillarium [Family: Arecaceae]
Synonym: O. filamentosum
Common name: Nibung Palm
Location: Singapore
Date taken: 1 May 2009
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Scientific name: Ophioglossum reticulatum [Family: Ophioglossaceae]
Common name: Adder's Tongue Fern
Chinese name: 心叶瓶尔小草
Location: Singapore
Date taken: 29 March 2008
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Scientific name: Ophiorrhiza pumila [Family: Rubiaceae]
Common name: Dwarf Ophiorrhiza
Chinese name: 短小蛇根草
Location: Singapore
Date taken: 12 July 2008
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Scientific name: Orthosiphon aristatus [Family: Lamiaceae / Labiatae]
Synonym: O. spiralis, O. stamineus, Ocimum aristatum, Clerodendrum spicatum, Clerodendranthus spicatus
Common name: Cat's Whiskers
Chinese name: 猫须草
Location: Singapore
Date taken: 6 September 2008
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HYBRID/CULTIVAR

Scientific name: Oryza sativa [Family: Poaceae]
Synonym: O. glutinosa
Common name: Rice, Padi
Chinese name: 稻米
Location: Singapore
Date taken: 26 January 2009
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Scientific name: Osmoxylon lineare [Family: Araliaceae]
Common name: Green Aralia
Location: Singapore
Date taken: 7 February 2008
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HYBRID/CULTIVAR

Scientific name: Otacanthus caeruleus [Family: Plantaginaceae]
Common name: Amazon Blue, Brazilian Snapdragon
Location: Singapore
Date taken: 13 September 2008
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Scientific name: Ottochloa nodosa [Family: Poaceae]
Synonym: Panicum nodosum
Common name: Slender Panic Grass
Location: Singapore
Date taken: 18 July 2009
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Scientific name: Oxalis barrelieri [Family: Oxalidaceae]
Common name: Lavender Sorrel
Location: Singapore
Date taken: 29 December 2007
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HYBRID/CULTIVAR [1]

Scientific name: Oxalis corniculata [Family: Oxalidaceae]
Synonym: Xanthoxalis corniculata, Acetosella corniculata
Common name: Creeping Wood Sorrel, Yellow Wood Sorrel
Chinese name: 酢浆草
Location: Singapore
Date taken: 13 December 2009
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HYBRID/CULTIVAR [1]

Scientific name: Oxyceros longiflorus [Family: Rubiaceae]
Synonym: O. pauciflorus, O. sinensis
Common name: Akar Berdara Laut, Akar Duri
Location: Singapore
Date taken: 6 September 2008
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