Flowering plants

Obscure Morning Glory Ipomoea obscura

Oceanblue Morning Glory Ipomoea indica

Ochna jabotapita Ochna jabotapita

Ochna lanceolata Ochna lanceolata

Odontonema callistachyum Odontonema callistachyum

LC Officinal Breynia செம்பூலா · Breynia vitis-idaea

LC Olax imbricata Olax imbricata

Old World Diamond Flower Oldenlandia corymbosa

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Oldenlandia stricta Oldenlandia stricta

Oldenlandia umbellata இம்பூறல் · Oldenlandia umbellata

Ophiorrhiza mungos Ophiorrhiza mungos

Ophiorrhiza rugosa Ophiorrhiza rugosa

VUEndemic ophylus zeylanicus ophylus zeylanicus

LC Opposite Leaf Fig பேய் அத்தி · Ficus hispida

Orange Climber Zanthoxylum asiaticum

LC Orange Mangrove Bruguiera gymnorhiza

Orange Tick-Trefoil Hylodesmum repandum

LC Orange Wild Rhea Debregeasia longifolia

LC Orangeberry பூமிப்பழம் · Glycosmis pentaphylla

Orangefruit Passionflower Passiflora vesicaria

LC Orchid Tree மந்தாரை · Bauhinia purpurea

LC Orchid Tree மலையாத்தி · Bauhinia variegata

Oriental False Hawksbeard Youngia japonica

LC Oriental Trema Trema orientale

Osbeckia aspera Osbeckia aspera

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Osbeckia buxifolia Osbeckia buxifolia

Osbeckia lanata Osbeckia lanata

Osbeckia muralis Osbeckia muralis

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Osbeckia rheedei Osbeckia rheedei

Osbeckia rubicunda Osbeckia rubicunda

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Osbeckia walkeri Osbeckia walkeri

Osbeckia zeylanica Osbeckia zeylanica

Oval-Leaf False-Buttonweed Spermacoce latifolia

Oxeye Daisy Leucanthemum vulgare