Plants — B
- Baccaurea parviflora
- Baccaurea ramiflora Burmese grape
- Baccharis articulata
- Baccharis dracunculifolia
- Baccharis halimifolia
- Bacopa monnieri Indian-pennywort
- Baeckea frutescens Shrubby Baeckea
- Baissea axillaris
- Bakeridesia gaumeri
- Baliospermum solanifolium Montane Baliospermum
- Balsamorhiza sagittata arrowleaf balsamroot
- Bambusa vulgaris
- Banisteriopsis caapi Mariri
- Barbarea vulgaris Bittercress
- Barringtonia acutangula Hijal
- Barringtonia macrostachya
- Basella alba Ceylon Spinach
- Bassia scoparia Belvedere
- Bauhinia forficata Brazilian orchid tree
- Bauhinia racemosa Bidi leaf tree
- Bauhinia scandens Phanera scandens
- Bauhinia strychnifolia
- Bauhinia tarapotensis
- Begonia sutherlandii
- Bellis perennis Common Daisy
- Benincasa hispida ash gourd
- Berberis aristata Indian Barberry
- Berberis fortunei Fortune mahonia
- Berberis vulgaris Barberry
- Berberis wilsoniae Mrs Wilson's Barberry
- Bergenia Elephants Ears
- Bergenia crassifolia Elephant's ears
- Beta vulgaris Beet
- Beta vulgaris cicla chard
- Beta vulgaris subsp. vulgaris Conditiva Group beet
- Betula Birch
- Betula alnoides Himalayan birch
- Betula lenta
- Betula pendula
- Betula pendula 'Youngii'
- Betula platyphylla Asian white birch
- Biancaea decapetala Cat's claw
- Biancaea sappan Indian redwood
- Bidens alba Beggar's Lice
- Bidens cernua Bur Marigold
- Bidens frondosa Beggar-ticks
- Bidens pilosa
- Bidens radiata Greater Bur Marigold
- Bidens tripartita Erect-bur-marigold
- Bistorta officinalis Common Bistort
- Bistorta vivipara Alpine Bistort
- Bixa orellana
- Blighia sapida ackee
- Boerhavia diffusa Red Spiderling
- Boerhavia erecta Erect Spiderling
- Boesenbergia rotunda Chinese Ginger
- Bombax ceiba Indian kapok
- Bombyx mori Domestic silk moth
- Borago officinalis borage
- Boschniakia rossica Northern groundcone
- Boswellia sacra
- Boswellia serrata Indian Frankincense
- Bouea oppositifolia Narrow-leaved Kundang
- Bougainvillea Bouganvillea
- Bowiea
- Brasiliopuntia brasiliensis
- Brassica juncea Brown Mustard
- Brassica napus Rapeseed
- Brassica napus rapifera Brassica napus subsp. rapifera
- Brassica nigra Black Mustard
- Brassica oleracea Cabbage
- Brassica oleracea var. capitata
- Brassica oleracea var. gongylodes kohlrabi
- Brassica rapa
- Breynia glauca
- Bridelia retusa
- Bridelia stipularis Climbing Bridelia
- Broussonetia papyrifera
- Brucea javanica Java brucea
- Brugmansia × candida Angel's-trumpet
- Brugmansia sanguinea
- Bruguiera cylindrica Bakau Putih
- Bruguiera gymnorhiza Burmese Mangrove
- Bryonia Bryony
- Bryonia alba Eastern White-bryony
- Buchanania arborescens Sparrow’s Mango
- Buchanania siamensis
- Buddleja officinalis Pole butterflybush
- Bulnesia sarmientoi Paraguay-lignum-vitae
- Bupleurum scorzonerifolium Red Thorowax
- Bursera graveolens
- Butea monosperma Bengal kino
- Butea superba
- Buxus sempervirens Box
- Buxus sinica Chinese boxwood