Flowering plants
109 species| Photo | English | සිංහල | தமிழ் | Scientific name | IUCN | Endemic |
|---|---|---|---|---|---|---|
| Bakau Putih | — | — | Bruguiera cylindrica | LC | — | |
| Balloonplant | — | — | Gomphocarpus physocarpus | LC | — | |
| Banana Passionfruit | — | — | Passiflora tarminiana | — | ||
| Bandicoot Berry | ගුරුල්ල | பொலவக்கொடி | Leea indica | LC | — | |
| Bantigue | — | — | Pemphis acidula | LC | — | |
| Barbados Nut | — | — | Jatropha curcas | LC | — | |
| Barberton Daisy | — | — | Gerbera jamesonii | — | ||
| Barleria arnottiana | — | — | Barleria arnottiana | — | ||
| Barleria buxifolia | — | — | Barleria buxifolia | — | ||
| Barleria involucrata | — | — | Barleria involucrata | — | ||
| Barleria vestita | — | — | Barleria vestita | — | ||
| Baycedar | — | — | Suriana maritima | LC | — | |
| Be Still Tree | — | — | Rauvolfia tetraphylla | LC | — | |
| Beach Bean | — | — | Canavalia rosea | LC | — | |
| Beach Gardenia | — | பன்னீர் மரம் | Guettarda speciosa | LC | — | |
| Beach Moonflower | — | — | Ipomoea violacea | — | ||
| Beach Naupaka | — | — | Scaevola taccada | — | ||
| Beach Pea | — | — | Vigna marina | LC | — | |
| Beach Sheoak | — | — | Casuarina equisetifolia | LC | — | |
| Beach Vitex | — | — | Vitex rotundifolia | — | ||
| Bearded Begonia | — | — | Begonia hirtella | — | ||
| Bearded Knotweed | — | — | Persicaria barbata | LC | — | |
| Beautiful Bougainvillea | — | — | Bougainvillea spectabilis | — | ||
| Begonia cordifolia | — | — | Begonia cordifolia | — | ||
| Begonia malabarica | — | செங்குருந்து | Begonia malabarica | — | ||
| Begonia subpeltata | — | — | Begonia subpeltata | — | ||
| Begonia tenera | — | — | Begonia tenera | — | ||
| Bellyache Bush | — | காட்டாமணக்கு | Jatropha gossypiifolia | LC | — | |
| Bengal Currant | මහ කරඹ | கிளா | Carissa carandas | DD | — | |
| Bengal Trumpet | — | — | Thunbergia grandiflora | — | ||
| Benkara malabarica | — | — | Benkara malabarica | — | ||
| Berberis ceylanica | — | — | Berberis ceylanica | Endemic | ||
| Betel Leaf | බුලත් | வெற்றிலை | Piper betle | — | ||
| Bhesa ceylanica | — | — | Bhesa ceylanica | VU | Endemic | |
| Bidens odorata | — | — | Bidens odorata | — | ||
| Bidi Leaf Tree | මයිල | ஆத்தி | Bauhinia racemosa | LC | — | |
| Bifid Bladderwort | — | யூட்ரிகுலோரியா பைபிடா | Utricularia bifida | LC | — | |
| Big-Leaf Mahogany | — | மகாகனி | Swietenia macrophylla | EN | — | |
| Big-Leaved Acacia | — | கத்தி சவுக்கு | Acacia mangium | LC | — | |
| Bilimbi | බිලිං | விளி | Averrhoa bilimbi | LC | — | |
| Billygoat Weed | — | பூம்புல் | Ageratum conyzoides | — | ||
| Bindii | — | — | Acanthospermum hispidum | — | ||
| Biophytum nervifolium | — | — | Biophytum nervifolium | — | ||
| Biophytum reinwardtii | — | — | Biophytum reinwardtii | — | ||
| Bird Flower | — | — | Crotalaria laburnifolia | — | ||
| Bird’s-Eye Speedwell | — | — | Veronica persica | — | ||
| Birdfoot Grape-Vine | — | — | Cayratia pedata | VU | — | |
| Birdsville Indigo | — | — | Indigofera linnaei | — |
