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Oblong-leaved Snake Herb  (Family : ACANTHACEAE)Obtuse-leaved mimusops  (Family : SAPOTACEAE)
 Odollum Tree, Dog-bane  (Family : APOCYNACEAE)
 Oil Palm  (Family : ARECACEAE)
 Oil-cake Tree  (Family : FABACEAE)
 Old Gold flat Sedge  (Family : CYPERACEAE)
 Oleander  (Family : APOCYNACEAE)
 Oliver  (Family : ASTERACEAE)
 One-leaf Senna  (Family : FABACEAE)
 Orange brasiletto climber, Candy Corn Plant  (Family : FABACEAE)
 Orange Climber  (Family : RUTACEAE)
 Orange Climber  (Family : RUTACEAE)
 Orange Climber, Forest Pepper, Wild orange tree  (Family : RUTACEAE)
 Orange Jasmine  (Family : RUTACEAE)
 Orange pumpkin, Summer Squash  (Family : CUCURBITACEAE)
 Orange Spade Flower, Spade Flower, Pink Ladies Slipper  (Family : VIOLACEAE)
 Orange Tephrosia  (Family : FABACEAE)
 Oriental Arbor-vitae  (Family : CUPRESSACEAE)
 Oval-Leaf Fan-Petals  (Family : MALVACEAE)
 Oval-leaved wheel creeper  (Family : COMBRETACEAE)
 
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