An
- Anagallis
- X Anagallis arvensis — scarlet pimpernel
- Anaphalis
- N Anaphalis margaritacea — pearly everlasting
- Anchusa
- X Anchusa arvensis — small bugloss, annual bugloss, alkanet
- X Anchusa officinalis — common bugloss
- Andromeda
- N Andromeda glaucophylla — bog rosemary, rosemary-leaf marsh andromeda
- N Andromeda polifolia var. jamesiana — James Bay bog rosemary
- N Andromeda polifolia var. polifolia — northern bog rosemary, marsh holyrose
- Andropogon
- N Andropogon gerardii — big bluestem, turkeyfoot
- N Andropogon virginicus — broom-sedge
- Androsace
- ? Androsace occidentalis — western rock-jasmine
- N Androsace septentrionalis — pygmy-flower rock-jasmine, northern androsace
- Anemone
- N Anemone acutiloba — sharp-lobed hepatica, sharp-lobed liverleaf
- N Anemone americana — round-lobed hepatica, American liverleaf
- X Anemone blanda
- N Anemone canadensis — Canada anemone, roundleaf thimbleweed
- N Anemone cylindrica — long-fruited anemone, thimbleweed, candle anemone, long-headed anemone
- N Anemone multifida — cutleaf anemone, cliff anemone, early anemone
- N Anemone parviflora — northern anemone, small-flowered anemone
- N Anemone patens — pasqueflower, prairie smoke, prairie crocus, cutleaf anemone
- N Anemone quinquefolia — wood anemone, snow-drops
- N Anemone richardsonii — Richardson's anemone, yellow anemone
- N Anemone virginiana — tall thimbleweed, riverbank anemone
- Anethum
- X Anethum graveolens — dill, Indian dill
- Angelica
- N Angelica atropurpurea — purplestem angelica, dark-purple alexanders, wild masterwort, great angelica
- ? Angelica lucida — seabeach angelica, shiny angelica
- X Angelica sylvestris
- ? Angelica venenosa — hairy angelica
- Anoda
- X Anoda cristata — crested anoda
- Antennaria
- N Antennaria howellii subsp. canadensis — Canada pussytoes
- N Antennaria howellii subsp. howellii — Howell's pussytoes
- N Antennaria howellii subsp. neodioica — northern pussytoes, common pussytoes
- N Antennaria howellii subsp. petaloidea — small pussytoes
- N Antennaria microphylla — littleleaf pussytoes
- N Antennaria neglecta — field pussytoes
- N Antennaria oxyphylla
- N Antennaria parlinii subsp. fallax — largeleaf pussytoes, deceitful pussytoes
- N Antennaria parlinii subsp. parlinii — Parlin's pussytoes, smooth pussytoes, plainleaf pussytoes
- N Antennaria parvifolia — small-leaf pussytoes, Rocky Mountain cudweed, Nuttall's pussytoes
- N Antennaria pulcherrima — showy pussytoes, handsome pussytoes
- N Antennaria rosea — rosy pussytoes, pink everlasting
- N Antennaria subviscosa
- Anthemis
- X Anthemis arvensis — corn chamomile, field chamomile
- X Anthemis cotula — mayweed, stinking chamomile, fœtid chamomile, dog fennel, stinking mayweed
- X Anthemis tinctoria — golden chamomile
- Anthoxanthum
- X Anthoxanthum odoratum — sweet vernalgrass, sweetgrass
- Anthriscus
- X Anthriscus cerefolium — common chervil
- X Anthriscus sylvestris — wild chervil, woodland chervil, cow parsley, beak-chervil
- Anthyllis
- X Anthyllis vulneraria — kidney vetch, lady's fingers
- Antirrhinum
- X Antirrhinum majus — common snapdragon
- X Antirrhinum orontium — lesser snapdragon
Read more about this topic: List Of Canadian Plants By Genus