List of Canadian plants by genus

Below is a list of Canadian plants by genus. Due to the vastness of Canada's biodiversity, this page is divided.

Many of the plants seen in Canada are introduced, either intentionally or accidentally. N indicated native and X indicated exotic. Those plants whose status is unknown are marked with a ?.

A | B | C | D | E | F | G | H | I J K | L | M | N | O | P Q | R | S | T | U V W | X Y Z

Ab

* "Abies"
** N "Abies amabilis" — Pacific silver fir, amabilis fir
** N "Abies balsamea" — balsam fir
** N "Abies grandis" — grand fir
** N "Abies lasiocarpa" — subalpine fir

* "Abutilon"
** X "Abutilon theophrasti" — velvetleaf, butterprint, Indian mallow

Ac

* "Acalypha"
** N "Acalypha virginica" — Virginia copperleaf, Virginia threeseed mercury

* "Acanthospermum"
** X "Acanthospermum hispidum" — hispid greenstripe

* "Acer"
** X "Acer campestre" — hedge maple, field maple
** X "Acer ginnala" — Amur maple, ginnala maple
** N "Acer negundo" — Manitoba maple, box-elder, ashleaf maple
** N "Acer nigrum" — black maple, black sugar maple, rock maple
** N "Acer pensylvanicum" — striped maple, moose maple, goosefoot maple
** X "Acer platanoides" — Norway maple, Schwedler maple, crimson king maple
** X "Acer pseudoplatanus" — sycamore maple, Scottish maple, great maple
** N "Acer rubrum" — red maple, swamp maple, scarlet maple
** N "Acer saccharinum" — silver maple, soft maple, white maple, silverleaf maple, river maple
** N "Acer saccharum" — sugar maple, hard maple
** N "Acer spicatum" — mountain maple
** N "Acer × freemanii" ("A. rubrum" × "A. saccharinum") — Freeman's maple

* "Achillea"
** X "Achillea filipendulina" — fernleaf yarrow
** N "Achillea millefolium" subsp. "borealis" — northern yarrow
** N "Achillea millefolium" subsp. "lanulosa" — woolly yarrow
** X "Achillea millefolium" subsp. "millefolium" — common yarrow, milfoil
** X "Achillea ptarmica" — false sneezewort, white tansy, sneezewort yarrow, pearl yarrow
** N "Achillea sibirica" — Siberian yarrow, many-flowered yarrow

* "Acinos"
** X "Acinos arvensis" — mother-of-thyme, spring savoury, basil thyme

* "Aconitum"
** X "Aconitum napellus" — garden monk's-hood, helmet flower, Venus' chariot, aconite
** X "Aconitum variegatum" — Manchurian monk's-hood
** X "Aconitum × bicolor" ("A. napellus" × "A. variegatum") — hybrid monk's-hood, two-coloured wolf's-bane

* "Acorus"
** N "Acorus americanus" — sweetflag
** X "Acorus calamus" — European sweetflag

* "Acroptilon"
** X "Acroptilon repens" — Russian knapweed

* "Actaea"
** N "Actaea pachypoda" — white baneberry, doll's-eyes
** N "Actaea rubra" — red baneberry
** N "Actaea × ludovici" ("A. pachypoda" × "A. rubra") — hybrid baneberry

Ad

* "Adenocaulon"
** N "Adenocaulon bicolor" — trail-plant

* "Adiantum"
** N "Adiantum pedatum" — northern maidenhair fern, five-finger fern

* "Adlumia"
** N "Adlumia fungosa" — Allegheny vine, climbing fumitory

* "Adonis"
** X "Adonis annua" — pheasant's-eye

* "Adoxa"
** N "Adoxa moschatellina" — moschatel, muskroot, townhall clock

Ae

* "Aegopodium"
** X "Aegopodium podagraria" — goutweed, snow-on-the-mountain, goat's-foot, ground elder, bishop's weed

* "Aesculus"
** N "Aesculus glabra" — Ohio buckeye, fœtid buckeye
** X "Aesculus hippocastanum" — common horsechestnut

* "Aethusa"
** X "Aethusa cynapium" — fool's-parsley

Ag

* "Agalinis"
** N "Agalinis gattingeri" — Gattinger's agalinis Endangered
** N "Agalinis paupercula" — small-flowered purple false-foxglove, small-flowered agalinis
** N "Agalinis purpurea" — purple false foxglove, large purple agalinis
** N "Agalinis skinneriana" — Skinner's agalinis Endangered
** N "Agalinis tenuifolia" — slenderleaf purple false foxglove, slenderleaf agalinis

* "Agastache"
** N "Agastache foeniculum" — anise hyssop, blue giant hyssop
** N "Agastache nepetoides" — yellow giant hyssop
** N "Agastache scrophulariifolia" — purple giant hyssop

* "Agoseris"
** N "Agoseris glauca" — pale false-dandelion, prairie agoseris, pale agoseris, pale goat-chicory, large-flowered false-dandelion

* "Agrimonia"
** X "Agrimonia eupatoria" — medicinal agrimony, church steeples, European groovebur
** N "Agrimonia gryposepala" — tall hairy agrimony, tall hairy groovebur
** N "Agrimonia parviflora" — smallflower groovebur, harvestlice agrimony
** N "Agrimonia pubescens" — soft groovebur, soft agrimony
** N "Agrimonia striata" — woodland agrimony, grooved agrimony

* "Agropyron"
** X "Agropyron cristatum" — crested wheatgrass

* "Agrostemma"
** X "Agrostemma githago" — common corncockle

* "Agrostis"
** ? "Agrostis canina" — brown bentgrass
** X "Agrostis capillaris" — colonial bentgrass, browntop, Prince Edward Island bentgrass, Rhode Island bentgrass
** X "Agrostis gigantea" — black bentgrass, redtop
** N "Agrostis hyemalis" — winter bentgrass, ticklegrass
** N "Agrostis mertensii" — northern bentgrass
** N "Agrostis perennans" — upland bentgrass, perennial bentgrass
** N "Agrostis scabra" — rough bentgrass, tickle grass, rough hairgrass, twin bentgrass
** N "Agrostis stolonifera" — creeping bentgrass, spreading bentgrass

Ai

* "Ailanthus"
** X "Ailanthus altissima" — tree-of-Heaven, Chinese sumac, stinktree, varnish tree

Aj

* "Ajuga"
** X "Ajuga genevensis" — Geneva bugleweed
** X "Ajuga reptans" — carpet bugleweed, common bugle, creeping bugleweed

Al

* "Alcea"
** X "Alcea pallida" — pale hollyhock
** X "Alcea rosea" — hollyhock

* "Alchemilla"
** X "Alchemilla filicaulis" — thin-stemmed lady's-mantle
** X "Alchemilla monticola" — hairy lady's-mantle

* "Aletris"
** N "Aletris farinosa" — colicroot Threatened

* "Alisma"
** N "Alisma gramineum" — grass-leaved water-plantain
** N "Alisma subcordatum" — southern water-plantain
** N "Alisma triviale" — northern water-plantain

* "Alliaria"
** X "Alliaria petiolata" — garlic mustard, hedge garlic

* "Allium"
** N "Allium burdickii" — narrow-leaved wild leek
** N "Allium canadense" — Canada wild onion, meadow garlic, meadow onion
** N "Allium cernuum" — nodding onion
** X "Allium oleraceum" — wild garlic
** X "Allium sativum" — garlic
** X "Allium schoenoprasum" var. "schoenoprasum" — chives
** N "Allium schoenoprasum" var. "sibiricum" — Siberian chives
** N "Allium stellatum" — prairie onion, wild onion
** N "Allium tricoccum" — wild leek, small wild leek, ramps
** X "Allium vineale" — field garlic

* "Alnus"
** X "Alnus glutinosa" — black alder, European alder
** N "Alnus incana" — grey alder, white alder, hoary alder, speckled alder
** N "Alnus viridis" — green alder, mountain alder, American green alder, Siberian alder, Sitka alder

* "Alopecurus"
** N "Alopecurus aequalis" — shortawn foxtail
** N "Alopecurus alpinus" — alpine foxtail
** X "Alopecurus geniculatus" — water foxtail
** X "Alopecurus pratensis" — meadow foxtail

* "Althaea"
** X "Althaea hirsuta" — hairy marsh-mallow
** X "Althaea officinalis" — common marsh-mallow

* "Alyssum"
** X "Alyssum alyssoides" — pale alyssum, small alyssum, yellow alyssum, pale madwort
** X "Alyssum murale" — yellow-tuft

Am

* "Amaranthus"
** X "Amaranthus albus" — white tumbleweed, tumble pigweed, tumbleweed amaranth
** X "Amaranthus blitoides" — prostrate amaranth, prostrate pigweed, matweed
** X "Amaranthus blitum" — purple amaranth
** X "Amaranthus cruentus" — blood amaranth, purple amaranth, red amaranth, caterpillar amaranth, African spinach
** X "Amaranthus hybridus" — smooth amaranth, hybrid amaranth, green pigweed, smooth pigweed, green amaranth
** X "Amaranthus palmeri" — Palmer's amaranth
** X "Amaranthus powellii" — green amaranth, Powell's smooth amaranth
** X "Amaranthus retroflexus" — redroot amaranth, redroot pigweed, wild-beet amaranth, rough pigweed
** X "Amaranthus spinosus" — spiny amaranth
** N "Amaranthus tuberculatus" — roughfruit amaranth, roughfruit waterhemp, tall waterhemp, tall pigweed

* "Ambrosia"
** N "Ambrosia artemisiifolia" — common ragweed, annual ragweed, annual bur-sage
** N "Ambrosia psilostachya" — perennial ragweed, western ragweed, naked-spike ambrosia, Cuman ragweed
** N "Ambrosia trifida" — giant ragweed, great ragweed, buffalo-weed, skeleton-leaf bur-sage

* "Amelanchier"
** N "Amelanchier alnifolia" — Saskatoonberry, northwestern serviceberry
** N "Amelanchier arborea" — downy serviceberry, downy juneberry, common serviceberry
** N "Amelanchier bartramiana" — mountain juneberry, Bartram's shadbush, Bartram's chuckleypear
** N "Amelanchier canadensis" — Canada serviceberry, swamp shadbush, thicket serviceberry
** N "Amelanchier humilis" — low serviceberry, running serviceberry
** N "Amelanchier laevis" — smooth juneberry, Allegheny serviceberry, smooth chuckleypear
** N "Amelanchier sanguinea" var. "gaspensis" — Gaspé roundleaf juneberry
** N "Amelanchier sanguinea" var. "sanguinea" — roundleaf juneberry, roundleaf serviceberry, Fernald's chuckleypear
** N "Amelanchier stolonifera" — running serviceberry, running juneberry, running chuckleypear
** N "Amelanchier × intermedia" ("A. arborea" × "A. canadensis") — swamp sugarpear
** N "Amelanchier × neglecta" ("A. bartramiana" × "A. laevis") — hybrid juneberry
** N "Amelanchier × quinti-martii" ("A. arborea" × "A. bartramiana") — Quint-mart's serviceberry
** N "Amelanchier × wiegandii" ("A. arborea" × "A. sanguinea") — Wiegand's serviceberry

* "Amerorchis"
** N "Amerorchis rotundifolia" — small roundleaf orchis, oneleaf orchid

* "Ammannia"
** N "Ammannia robusta" — scarlet ammannia Endangered

* "Ammophila"
** N "Ammophila breviligulata" — American beachgrass

* "Amorpha"
** N "Amorpha canescens" — leadplant, downy indigobush
** N "Amorpha fruticosa" — false indigo

* "Amphicarpaea"
** N "Amphicarpaea bracteata" — American hog-peanut

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
** 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

Ap

* "Apera"
** X "Apera interrupta" — dense silky bentgrass, interrupted bentgrass, interrupted windgrass
** X "Apera spica-venti" — silky bentgrass

* "Apios"
** N "Apios americana" — American groundnut, Indian potato, wild bean, potato-bean

* "Aplectrum"
** N "Aplectrum hyemale" — puttyroot

* "Apocynum"
** N "Apocynum androsaemifolium" — spreading dogbane
** N "Apocynum cannabinum" — Indian hemp, clasping-leaf dogbane, prairie dogbane, velvet dogbane, amyroot
** N "Apocynum sibiricum" — clasping-leaved dogbane
** N "Apocynum × floribundum" ("A. androsaemifolium" × "A. cannabinum") — intermediate dogbane, bitter dogbane

Aq

* "Aquilegia"
** N "Aquilegia brevistyla" — small-flowered columbine
** N "Aquilegia canadensis" — Canadian columbine, red columbine
** X "Aquilegia vulgaris" — European columbine, garden columbine, culverwort, capon's feather

Ar

* "Arabidopsis"
** X "Arabidopsis thaliana" — mouse-ear cress, wall-cress

* "Arabis"
** N "Arabis alpina" subsp. "alpina" — alpine rockcress
** X "Arabis alpina" subsp. "caucasica" — wall rockcress, grey rockcress
** N "Arabis arenicola" var. "arenicola" — arctic rockcress
** N "Arabis arenicola" var. "pubescens" — sand rockcress
** N "Arabis canadensis" — sicklepod
** N "Arabis divaricarpa" — limestone rockcress
** N "Arabis drummondii" — Drummond rockcress
** N "Arabis glabra" — tower-mustard
** N "Arabis hirsuta" var. "adpressipilis" — hairy rockcress, creamflower rockcress
** N "Arabis hirsuta" var. "pycnocarpa" — creamflower rockcress
** N "Arabis holboelli" var. "retrofracta" — Holboell's rockcress
** N "Arabis holboelli" var. "secunda" — "'bristly-leaved rockcress"
** ? "Arabis kamchatica" — lyreleaf rockcress (species status disputed)
** N "Arabis laevigata" — smooth rockcress
** N "Arabis lyrata" — lyreleaf rockcress
** N "Arabis shortii" — Short's rockcress

* "Aralia"
** X "Aralia elata" — Japanese Angelica-tree, Chinese Angelica-tree
** N "Aralia hispida" — bristly spikenard, bristly sarsaparilla, dwarf elder
** N "Aralia nudicaulis" — wild sarsaparilla, small spikenard
** N "Aralia racemosa" — American spikenard, Indian-root, life-of-man, petty morel
** X "Aralia spinosa" — Hercules' club, Devil's walkingstick, prickly ash, Angelica tree, toothache tree

* "Arceuthobium"
** N "Arceuthobium americanum" — pine mistletoe, American mistletoe, lodgepole pine dwarf mistletoe
** N "Arceuthobium pusillum" — dwarf mistletoe, eastern dwarf mistletoe

* "Arctagrostis"
** N "Arctagrostis latifolia" — polargrass

* "Arctium"
** X "Arctium lappa" — great burdock
** X "Arctium minus" subsp. "minus" — common burdock
** X "Arctium minus" subsp. "nemorosum" — lesser burdock
** X "Arctium pubens" — wood burdock
** X "Arctium tomentosum" — woolly burdock, tomentose burdock
** X "Arctium × nothum" ("A. lappa" × "A. minus") — hybrid burdock

* "Arctophila"
** N "Arctophila fulva" — pendant grass

* "Arctostaphylos"
** N "Arctostaphylos alpina" — alpine bearberry
** N "Arctostaphylos rubra" — red manzanita
** N "Arctostaphylos uva-ursi" — bearberry, kinnikinnick, mealberry

* "Arenaria"
** N "Arenaria humifusa" — creeping sandwort, low sandwort, spreading sandwort
** X "Arenaria serpyllifolia" — thymeleaf sandwort

* "Arethusa"
** N "Arethusa bulbosa" — dragon's mouth, swamp pink

* "Argemone"
** X "Argemone mexicana" — Mexican prickly-poppy

* "Arisaema"
** N "Arisaema dracontium" — green dragon Special Concern
** N "Arisaema triphyllum" — Jack-in-the-pulpit

* "Aristida"
** N "Aristida basiramea" — forktip threeawn Endangered
** N "Aristida dichotoma" — Shinner's threeawn
** N "Aristida longespica" var. "geniculata" — red threeawn
** N "Aristida longespica" var. "longespica" — slimspike threeawn
** X "Aristida oligantha" — prairie three-awn grass
** N "Aristida purpurascens" — arrow feather threeawn

* "Aristolochia"
** X "Aristolochia clematitis" — birthwort
** X "Aristolochia macrophylla" — pipevine

* "Armeria"
** N "Armeria maritima" — sea thrift, Labrador sea thrift, foxflower

* "Armoracia"
** X "Armoracia rusticana" — horseradish, red cole

* "Arnica"
** N "Arnica angustifolia" — narrowleaf arnica, arctic arnica, arctic leopardbane
** N "Arnica chamissonis" — meadow arnica, Chamisso's arnica, leafy arnica, leafy leopardbane
** N "Arnica cordifolia" — heartleaf arnica, heartleaf leopardbane
** N "Arnica lonchophylla" — northern arnica, longleaf arnica, white-plumed arnica, spearleaf arnica

* "Arnoglossum"
** N "Arnoglossum platagineum" — tuberous Indian-plantain Special Concern

* "Aronia"
** N "Aronia melanocarpa" — black chokeberry

* "Arrhenatherum"
** X "Arrhenatherum elatius" — tall oatgrass, French rye, tuber oatgrass, bulbous oatgrass, false oat grass

* "Artemisia"
** X "Artemisia abrotanum" — southern wormwood, southernwood, lad's love, oldman
** X "Artemisia absinthium" — common wormwood, absinthe, absinthe wormwood, European wormwood
** X "Artemisia annua" — sweet sagewort, annual wormwood, sweet Annie, sweet wormwood, annual mugwort
** X "Artemisia biennis" — biennial wormwood
** N "Artemisia campestris" subsp. "borealis" — boreal wormwood, Canada wormwood
** N "Artemisia campestris" subsp. "caudata" — tall wormwood, beach wormwood, wild wormwood, threadleaf sagewort, sagewort wormwood
** N "Artemisia dracunculus" — wild tarragon, dragon wormwood, dragon sagewort, false tarragon, French tarragon, Russian tarragon
** N "Artemisia frigida" — fringed sagebrush, prairie sagebrush, fringed sagewort, prairie sagewort, wormwood sage, pasture sage, arctic sagebrush
** N "Artemisia ludoviciana" — white sage, silver wormwood, prairie sage, western mugwort, darkleaf mugwort, cudweed sagewort, pasture sage, Louisiana wormwood, Louisiana sage, silver king artemisia, white wormwood, white sagebrush
** X "Artemisia pontica" — Roman wormwood, petite wormwood, green ginger
** X "Artemisia stelleriana" — hoary sagebrush, dusty miller, beach wormwood, old woman
** N "Artemisia tilesii" — Tilesius' wormood, mountain sagewort, oldwoman
** X "Artemisia vulgaris" — common mugwort, common wormwood

* "Aruncus"
** X "Aruncus dioicus" — common goat's-beard

As

* "Asarum"
** N "Asarum canadense" — Canada wild ginger

* "Asclepias"
** N "Asclepias exaltata" — poke milkweed, tall milkweed, four-leaved milkweed
** N "Asclepias hirtella" — tall green milkweed
** N "Asclepias incarnata" — swamp milkweed
** N "Asclepias ovalifolia" — oval-leaf milkweed, dwarf milkweed
** N "Asclepias purpurascens" — purple milkweed
** N "Asclepias quadrifolia" — four-leaved milkweed
** N "Asclepias sullivantii" — Sullivant's milkweed
** N "Asclepias syriaca" — common milkweed, silkweed, silky swallow-wort
** N "Asclepias tuberosa" — butterfly weed, orange milkweed, pleurisy root, chigger flower
** ? "Asclepias variegata" — white milkweed
** N "Asclepias verticillata" — whorled milkweed
** N "Asclepias viridiflora" — green milkweed, green comet milkweed, short green milkweed

* "Asimina"
** N "Asimina triloba" — common pawpaw

* "Asparagus"
** X "Asparagus officinalis" — garden asparagus, asparagus-fern

* "Asperugo"
** X "Asperugo procumbens" — German madwort, catchweed

* "Asperula"
** X "Asperula arvensis" — blue woodruff

* "Asplenium"
** N "Asplenium platyneuron" — ebony spleenwort
** N "Asplenium rhizophyllum" — walking fern
** N "Asplenium ruta-muraria" — wall-rue
** N "Asplenium scolopendrium" var. "americanum" — American Hart's-tongue fern Special Concern
** N "Asplenium trichomanes" — maidenhair spleenwort
** N "Asplenium viride" — green spleenwort

* "Aster"
** N "Aster alpinus" — alpine aster

* "Astragalus"
** N "Astragalus adsurgens" — ascending milkvetch, rattle milkvetch, standing milkvetch
** N "Astragalus agrestis" — field milkvetch, mile-vetch, cock's-head
** N "Astragalus alpinus" — alpine milkvetch
** N "Astragalus americanus" — American milkvetch
** N "Astragalus australis" — Indian milkvetch
** N "Astragalus canadensis" — Canada milkvetch, Carolina milkvetch
** X "Astragalus cicer" — chickpea milkvetch
** N "Astragalus eucosmus" — elegant milkvetch, pretty milkvetch
** X "Astragalus glycophyllos" — wild liquorice
** N "Astragalus neglectus" — Cooper's milkvetch
** N "Astragalus tenellus" — pulse milkvetch, loose-flower milkvetch

At

* "Athyrium"
** N "Athyrium filix-femina" var. "angustum" — northern lady fern
** N "Athyrium filix-femina" var. "cyclosorum" — northwestern lady fern

* "Atriplex"
** N "Atriplex dioica" — thickleaf orache, saline saltbush
** N "Atriplex glabriuscula" — smooth orache, Scotland orache, glabrous orache, northeastern saltbush
** X "Atriplex heterosperma" — two-scale orache
** X "Atriplex hortensis" — garden orache
** X "Atriplex oblongifolia" — oblong-leaf orache
** N "Atriplex patula" — spear orache, spreading orache, spearscale, halberdleaf orache, common orache
** N "Atriplex prostrata" — thinleaf orache, triangle orache, fat-hen
** X "Atriplex rosea" — tumbling orache

Au

* "Aureolaria"
** N "Aureolaria flava" — yellow false-foxglove
** N "Aureolaria pedicularia" — fernleaf yellow false-foxglove
** N "Aureolaria virginica" — downy false-foxglove

* "Aurinia"
** X "Aurinia saxatilis" — basket-of-gold, gold dust, gold alyssum

Av

* "Avena"
** X "Avena fatua" — wild oats
** X "Avena sativa" — oats, cultivated oats
** X "Avena sterilis" — animated oats

Ax

* "Axyris"
** X "Axyris amaranthoides" — Russian pigweed, upright axyris

Az

* "Azolla"
** N "Azolla caroliniana" — mosquito fern

References

"See:" Flora of Canada#References