Br
- Brachyelytrum
- N Brachyelytrum erectum var. erectum — bearded shorthusk
- N Brachyelytrum erectum var. glabratum — northern shorthusk
- Brasenia
- N Brasenia schreberi — watershield, purple wendock
- Brassica
- X Brassica juncea — Chinese mustard, Indian mustard, brown mustard, leaf mustard, Sarepta mustard
- X Brassica napus — rutabaga, canola, Swedish turnip, rapeseed, colza, oilseed rape, annual rape
- X Brassica nigra — black mustard
- X Brassica oleracea — cabbage, cauliflower, broccoli, kale, brussels sprouts, kohlrabi, chou broccoli
- Braya
- N Braya humilis — low northern rockcress, low braya
- Briza
- X Briza maxima — big quaking grass, large quaking grass
- X Briza media — perennial quaking grass
- Bromus
- X Bromus aleutensis — Aleut brome
- X Bromus arvensis — field brome
- X Bromus briziformis — rattlesnake brome
- X Bromus carinatus — California brome
- N Bromus ciliatus — fringed brome
- X Bromus commutatus — meadow brome, hairy brome
- X Bromus danthoniae — oat brome
- X Bromus erectus — erect brome, upright brome, meadow brome
- X Bromus hordeaceus — soft brome
- X Bromus inermis subsp. inermis — smooth brome, Hungarian brome, awnless brome
- N Bromus kalmii — Kalm's brome, prairie brome, wild chess
- N Bromus latiglumis — broad-glumed brome
- N Bromus nottowayanus — Nottoway brome grass
- N Bromus pubescens — hairy woodland brome
- N Bromus pumpellianus subsp. pumpellianus — Pumpell's brome
- X Bromus racemosus — spiked brome
- X Bromus secalinus — rye brome, cheat, chess
- X Bromus squarrosus — corn brome
- X Bromus sterilis — poverty brome
- X Bromus tectorum — cheat grass
- X Bromus × pseudothominii (B. hordeaceus × B. lepidus) — soft brome
Read more about this topic: List Of Canadian Plants By Genus B