Be
- Beckmania
- N Beckmannia syzigachne — American slough grass
- Belis
- X Bellis perennis — English daisy
- Berberis
- X Berberis aquifolium — Oregon grape, Oregon hollygrape, holly barberry
- X Berberis repens
- X Berberis thunbergii — Japanese barberry, purple Japanese barberry
- X Berberis vulgaris — European barberry, common barberry
- X Berberis × ottawensis (B. thunbergii × B. vulgaris) — Ottawa barberry
- Berterboa
- X Berteroa incana — hoary alyssum, hoary false madwort
- Berula
- N Berula erecta
- Betula
- N Betula alleghaniensis — yellow birch
- N Betula cordifolia — heartleaf birch, mountain white birch, mountain paper birch
- N Betula glandulosa — American dwarf birch, glandular birch, scrub birch, dwarf resin birch, resin birch, tundra dwarf birch
- N Betula lenta — sweet birch, cherry birch
- N Betula minor — dwarf white birch
- N Betula neoalaskana — Alaska birch, Alaskan paper birch, Alaska white birch
- N Betula occidentalis — water birch, western birch, western river birch, spring birch
- N Betula papyrifera — paper birch, white birch, canoe birch
- X Betula pendula — European white birch, weeping birch, silver birch
- N Betula populifolia — grey birch, fire birch, old field birch, poverty birch
- X Betula pubescens — downy birch, European white birch
- N Betula pumila — dwarf birch, bog birch, swamp birch
- N Betula × neoborealis (B. occidentalis × B. pumila)
- N Betula × purpusii (B. alleghaniensis × B. pumila)
- N Betula × sandbergii (B. papyrifera × B. pumila) — Sandberg's birch
- N Betula × sargentii (B. glandulosa × B. pumila) — Sargent's birch
Read more about this topic: List Of Canadian Plants By Genus B