List of Canadian plants by family A

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Main page: List of Canadian plants by family

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Acanthaceae

• Justicia americana — common water-willow

Aceraceae

Acer circinatum — vine maple Acer glabrum — Douglas maple Acer macrophyllum — bigleaf maple Acer negundo — box-elder Acer nigrum — black maple Acer pensylvanicum — striped maple

Acer rubrum — red maple Acer saccharinum — silver maple Acer saccharum — sugar maple Acer spicatum — mountain maple Acer × freemanii — Freeman's maple

Acoraceae

• Acorus americanus — sweetflag

Adelanthaceae

Odontoschisma denudatum Odontoschisma elongatum Odontoschisma gibbsiae

Odontoschisma macounii Odontoschisma sphagni

Adoxaceae

• Adoxa moschatellina — muskroot
• Viburnum acerifolium — mapleleaf viburnum
• Viburnum edule — squashberry
• Viburnum lantanoides — alderleaf viburnum
• Viburnum lentago — nannyberry
• Viburnum nudum — possum-haw viburnum
• Viburnum opulus — guelder-rose viburnum
• Viburnum rafinesquianum — downy arrowwood
• Viburnum recognitum — northern arrowwood

Agavaceae

Yucca filamentosa — common yucca

Yucca glauca — small soapweed yucca

Alismataceae

Alisma gramineum — narrowleaf water-plantain Alisma subcordatum — broad-leaved water-plantain Alisma triviale — northern water-plantain Sagittaria brevirostra — short-beaked arrowhead Sagittaria calycina — longlobe arrowhead

Sagittaria cristata — crested arrowhead Sagittaria cuneata — Wapatum arrowhead Sagittaria graminea — grassleaf arrowhead Sagittaria latifolia — broadleaf arrowhead Sagittaria rigida — sessile-fruit arrowhead

Amaranthaceae

Amaranthus albus — white pigweed Amaranthus californicus — California amaranth Amaranthus powellii — green amaranth

Amaranthus rudis — tall amaranth Amaranthus tuberculatus — roughfruit amaranth

Amblystegiaceae

Amblystegium serpens — amblystegium moss Amblystegium varium Calliergon cordifolium — calliergon moss Calliergon giganteum — giant calliergon moss Calliergon megalophyllum Calliergon obtusifolium Calliergon orbicularicordatum Calliergon richardsonii Calliergon stramineum Calliergon trifarium Calliergonella cuspidata Campylium cardotii Campylium chrysophyllum Campylium halleri Campylium hispidulum Campylium polygamum — campylium moss Campylium radicale Campylium stellatum — yellow starry fen moss Conardia compacta Cratoneuron filicinum Drepanocladus aduncus — drepanocladus moss Drepanocladus brevifolius Drepanocladus capillifolius Drepanocladus crassicostatus Drepanocladus sendtneri Hamatocaulis lapponicus Hamatocaulis vernicosus Hygroamblystegium fluviatile Hygroamblystegium noterophilum Hygroamblystegium tenax Hygrohypnum alpestre Hygrohypnum alpinum Hygrohypnum bestii

Hygrohypnum cochlearifolium Hygrohypnum duriusculum Hygrohypnum eugyrium Hygrohypnum luridum Hygrohypnum micans Hygrohypnum molle Hygrohypnum montanum Hygrohypnum norvegicum Hygrohypnum ochraceum Hygrohypnum polare Hygrohypnum smithii Hygrohypnum styriacum Hygrohypnum subeugyrium Leptodictyum humile Leptodictyum riparium Limprichtia cossonii Limprichtia revolvens — limprichtia moss Loeskypnum badium Loeskypnum wickesiae Palustriella commutata Palustriella decipiens Platylomella lescurii Pseudocalliergon turgescens Sanionia uncinata Sarmenthypnum sarmentosum Scorpidium scorpioides Warnstorfia exannulata — warnstorfia moss Warnstorfia fluitans — warnstorfia moss Warnstorfia procera Warnstorfia pseudostraminea Warnstorfia trichophylla Warnstorfia tundrae

Anacardiaceae

Rhus aromatica — fragrant sumac Rhus copallinum — winged sumac Rhus glabra — smooth sumac Rhus trilobata — skunkbush Rhus typhina — staghorn sumac

Rhus × pulvinata Toxicodendron diversilobum — western poison-oak Toxicodendron radicans — eastern poison-ivy Toxicodendron rydbergii — northern poison-oak Toxicodendron vernix — poison-sumac

Andreaeaceae

Andreaea alpestris Andreaea blyttii Andreaea crassinervia Andreaea heinemannii Andreaea megistospora Andreaea mutabilis

Andreaea nivalis Andreaea obovata Andreaea rothii Andreaea rupestris Andreaea schofieldiana Andreaea sinuosa

Andreaeobryaceae

• Andreaeobryum macrosporum

Aneuraceae

Aneura pinguis Riccardia chamedryfolia Riccardia latifrons

Riccardia multifida — comb liverwort Riccardia palmata

Annonaceae

• Asimina triloba — pawpaw

Anomodontaceae

Anomodon attenuatus Anomodon minor Anomodon rostratus Anomodon rugelii

Anomodon viticulosus Haplohymenium triste Pterogonium gracile

Antheliaceae

Anthelia julacea

Anthelia juratzkana

Anthocerotaceae

Anthoceros agrestis Anthoceros fusiformis

Anthoceros macounii

Apiaceae

Angelica archangelica — Norwegian angelica Angelica arguta — Lyall's angelica Angelica atropurpurea — great angelica Angelica dawsonii — Dawson's angelica Angelica genuflexa — kneeling angelica Angelica laurentiana — St. Lawrence angelica Angelica lucida — seacoast angelica Angelica venenosa — hairy angelica Berula erecta — wild parsnip Bupleurum americanum — American thorowax Chaerophyllum procumbens — spreading chervil Chaerophyllum tainturieri — Tainturier's chervil Cicuta bulbifera — bulb-bearing water-hemlock Cicuta douglasii — western water-hemlock Cicuta maculata — spotted water-hemlock Cicuta virosa — MacKenzie's water-hemlock Cnidium cnidiifolium — Jakutsk snow parsley Conioselinum chinense — Chinese hemlock-parsley Conioselinum gmelinii — western hemlock-parsley Cryptotaenia canadensis — Canada honewort Cymopterus acaulis — plains wavewing Daucus pusillus — southwestern carrot Erigenia bulbosa — harbinger-of-spring Glehnia littoralis — American glehnia Heracleum maximum — cow-parsnip Hydrocotyle americana — American water-pennywort Hydrocotyle umbellata — many-flowered pennywort Hydrocotyle verticillata — whorled pennywort Ligusticum calderi — Calder's lovage Ligusticum canbyi — Canby's wild lovage Ligusticum scoticum — Scotch lovage Ligusticum verticillatum — Idaho lovage Lilaeopsis chinensis — eastern lilæopsis Lilaeopsis occidentalis — western lilæopsis Lomatium ambiguum — streambank desert-parsley Lomatium brandegeei — Brandegee's desert-parsley Lomatium cous — cousroot desert-parsley Lomatium dissectum — fernleaf desert-parsley Lomatium foeniculaceum — carrotleaf desert-parsley

Lomatium geyeri — Geyer's desert-parsley Lomatium grayi — mountain desert-parsley Lomatium macrocarpum — largefruit desert-parsley Lomatium martindalei — coast range lomatium Lomatium nudicaule — nakedstem desert-parsley Lomatium orientale — Oriental desert-parsley Lomatium sandbergii — Sandberg's desert-parsley Lomatium simplex — umbrella desert-parsley Lomatium triternatum — ternate desert-parsley Lomatium utriculatum — foothill desert-parsley Musineon divaricatum — wild parsley Oenanthe sarmentosa — water-parsley Osmorhiza berteroi — Chilean sweet-cicely Osmorhiza claytonii — hairy sweet-cicely Osmorhiza depauperata — bluntfruit sweet-cicely Osmorhiza longistylis — smoother sweet-cicely Osmorhiza occidentalis — western sweet-cicely Osmorhiza purpurea — purple sweet-cicely Oxypolis occidentalis — western cowbane Oxypolis rigidior — stiff cowbane Perideridia gairdneri — Gairdner's yampah Podistera macounii — Macoun's podistera Podistera yukonensis — Yukon podistera Sanicula arctopoides — bear's-foot sanicle Sanicula bipinnatifida — purple black snakeroot Sanicula canadensis — short-styled sanicle Sanicula crassicaulis — Pacific black snakeroot Sanicula graveolens — sierra sanicle Sanicula marilandica — Maryland black snakeroot Sanicula odorata — clustered black snakeroot Sanicula trifoliata — large-fruited sanicle Sium suave — hemlock water-parsnip Taenidia integerrima — yellow pimpernel Thaspium barbinode — hairyjoint meadow-parsnip Thaspium trifoliatum — purple meadow-parsnip Yabea microcarpa — California hedge-parsley Zizia aptera — golden alexanders Zizia aurea — common alexanders

Apocynaceae

Apocynum androsaemifolium — spreading dogbane Apocynum cannabinum — clasping-leaf dogbane

Apocynum × floribundum — hybrid dogbane

Aquifoliaceae

Ilex glabra — ink-berry Ilex verticillata — black holly

Nemopanthus mucronatus — mountain holly

Araceae

Arisaema dracontium — green dragon Arisaema triphyllum — swamp Jack-in-the-pulpit Calla palustris — wild calla

Lysichiton americanus — yellow skunk-cabbage Peltandra virginica — green arrow-arum Symplocarpus foetidus — skunk-cabbage

Araliaceae

Aralia hispida — bristly sarsaparilla Aralia nudicaulis — wild sarsaparilla Aralia racemosa — American spikenard

Oplopanax horridus — Devil's-club Panax quinquefolius — American ginseng Panax trifolius — dwarf ginseng

Archidiaceae

• Archidium ohioense

Aristolochiaceae

Asarum canadense — Canada wild-ginger

Asarum caudatum — long-tailed wild-ginger

Arnelliaceae

• Arnellia fennica

Asclepiadaceae

Asclepias exaltata — poke milkweed Asclepias hirtella — green milkweed Asclepias incarnata — swamp milkweed Asclepias lanuginosa — woolly milkweed Asclepias ovalifolia — dwarf milkweed Asclepias purpurascens — purple milkweed Asclepias quadrifolia — whorled milkweed

Asclepias speciosa — showy milkweed Asclepias sullivantii — prairie milkweed Asclepias syriaca — Kansas milkweed Asclepias tuberosa — butterfly milkweed Asclepias verticillata — whorled milkweed Asclepias viridiflora — green milkweed

Aspleniaceae

Asplenium adulterinum — ladder spleenwort Asplenium platyneuron — ebony spleenwort Asplenium rhizophyllum — walking-fern spleenwort Asplenium ruta-muraria — wallrue spleenwort

Asplenium scolopendrium — hart's-tongue fern Asplenium trichomanes — maidenhair spleenwort Asplenium viride — green spleenwort

Asteraceae

Achillea millefolium — common yarrow Achillea sibirica — Siberian yarrow Adenocaulon bicolor — American trail-plant Ageratina altissima — white snakeroot Agoseris aurantiaca — orange-flowered false-dandelion Agoseris gaspensis — Gaspé Peninsula agoseris Agoseris glauca — pale goat-chicory Agoseris grandiflora — largeflower false-dandelion Agoseris heterophylla — annual false-dandelion Agoseris lackschewitzii — pink agoseris Almutaster pauciflorus — marsh alkali aster Ambrosia acanthicarpa — flatspine bursage Ambrosia artemisiifolia — annual ragweed Ambrosia chamissonis — silver bursage Ambrosia coronopifolia — western ragweed Ambrosia psilostachya — nakedspike ambrosia Ambrosia trifida — great ragweed Ambrosia × helenae Anaphalis margaritacea — pearly everlasting Antennaria alpina — alpine pussytoes Antennaria anaphaloides — handsome pussytoes Antennaria aromatica — aromatic pussytoes Antennaria corymbosa — meadow pussytoes Antennaria densifolia — dense-leaved antennaria Antennaria dimorpha — two-form pussytoes Antennaria eucosma — Newfoundland pussytoes Antennaria flagellaris — stoloniferous pussytoes Antennaria friesiana — Fries' pussytoes Antennaria howellii — small pussytoes Antennaria lanata — white-margined pussytoes Antennaria luzuloides — silvery-brown pussytoes Antennaria media — Stony Mountain pussytoes Antennaria microphylla — small-leaf cat's-foot Antennaria monocephala — single-head pussytoes Antennaria neglecta — field pussytoes Antennaria parlinii — Parlin's pussytoes Antennaria parvifolia — Nuttall's pussytoes Antennaria plantaginifolia — plantainleaf pussytoes Antennaria pulcherrima — handsome pussytoes Antennaria racemosa — Hooker's pussytoes Antennaria rosea — rosy pussytoes Antennaria stenophylla — narrowleaf pussytoes Antennaria umbrinella — brown pussytoes Antennaria × erigeroides Antennaria × macounii Antennaria × rousseaui Arnica amplexicaulis — streambank arnica Arnica angustifolia — narrowleaf leopardbane Arnica chamissonis — leafy arnica Arnica cordifolia — heart-leaved arnica Arnica frigida — snow leopardbane Arnica fulgens — hillside arnica Arnica gracilis — slender leopardbane Arnica lanceolata Arnica latifolia — mountain arnica Arnica lessingii — Lessing's arnica Arnica lonchophylla — northern arnica Arnica longifolia — longleaf arnica Arnica louiseana — Lake Louise arnica Arnica mollis — hairy arnica Arnica parryi — nodding arnica Arnica rydbergii — subalpine arnica Arnica sororia — twin arnica Arnica × diversifolia — rayless arnica Arnoglossum plantagineum — Indian-plantain Artemisia alaskana — Alaska wormwood Artemisia arctica — boreal sagebrush Artemisia biennis — biennial wormwood Artemisia campestris — Pacific wormwood Artemisia cana — hoary sagebrush Artemisia dracunculus — dragon wormwood Artemisia frigida — prairie sagebrush Artemisia furcata — three-fork wormwood Artemisia globularia — arctic wormwood Artemisia glomerata — Pacific alpine wormwood Artemisia laciniata — Siberian wormwood Artemisia lindleyana — Columbia River wormwood Artemisia longifolia — longleaf wormwood Artemisia ludoviciana — white sagebrush Artemisia michauxiana — Michaux's wormwood Artemisia rupestris — rock wormwood Artemisia suksdorfii — coastal wormwood Artemisia tilesii — Tilesius' wormwood Artemisia tridentata — big sagebrush Artemisia tripartita — three-tip sagebrush Aster alpinus — alpine aster Baccharis halimifolia — eastern baccharis Balsamorhiza deltoidea — deltoid balsamroot Balsamorhiza sagittata — arrowleaf balsamroot Bidens amplissima — Vancouver Island beggarticks Bidens cernua — nodding beggarticks Bidens connata — purplestem beggarticks Bidens coronata — tickseed sunflower Bidens discoidea — swamp beggarticks Bidens eatonii — Eaton's beggarticks Bidens frondosa — Devil's beggarticks Bidens heterodoxa — Connecticut beggarticks Bidens hyperborea — estuary beggarticks Bidens tripartita — three-lobe beggarticks Bidens vulgata — tall bur-marigold Boltonia asteroides — aster-like boltonia Brickellia grandiflora — tassel flower Brickellia oblongifolia — narrowleaf brickell-bush Cacaliopsis nardosmia — silvercrown Canadanthus modestus — great northern aster Chaenactis douglasii — hoary pincushion Chrysothamnus viscidiflorus — sticky-leaf rabbitbrush Cirsium brevistylum — shortstyle thistle Cirsium canescens — prairie thistle Cirsium discolor — field thistle Cirsium drummondii — Drummond's thistle Cirsium edule — edible thistle Cirsium flodmanii — Flodman's thistle Cirsium foliosum — leafy thistle Cirsium hillii — Hill's thistle Cirsium hookerianum — Hooker's thistle Cirsium muticum — swamp thistle Cirsium pitcheri — dune thistle Cirsium scariosum Cirsium undulatum — nodding thistle Cirsium × vancouverense Conyza canadensis — Canada horseweed Coreopsis lanceolata — sand coreopsis Coreopsis rosea — rose coreopsis Coreopsis tinctoria — golden tickseed Coreopsis tripteris — tall tickseed Crepis atribarba — slender hawk's-beard Crepis elegans — elegant hawk's-beard Crepis intermedia — smallflower hawk's-beard Crepis modocensis — Siskiyou hawk's-beard Crepis nana — dwarf alpine hawk's-beard Crepis occidentalis — grey hawk's-beard Crepis runcinata — nakedstem hawk's-beard Crocidium multicaule — common spring-gold Dendranthema arcticum — arctic daisy Doellingeria umbellata — flat-top white aster Echinacea angustifolia — narrow-leaved purple coneflower Echinacea pallida — pale purple coneflower Eclipta prostrata — false daisy Erechtites hieraciifolia — fireweed Ericameria nauseosa — rubber rabbitbrush Erigeron acris — bitter fleabane Erigeron alpiniformis — alpine fleabane Erigeron annuus — whitetop fleabane Erigeron asper — rough fleabane Erigeron aureus — alpine yellow fleabane Erigeron borealis — boreal fleabane Erigeron caespitosus — cæspitose fleabane Erigeron compositus — dwarf mountain fleabane Erigeron corymbosus — longleaf fleabane Erigeron divergens — spreading fleabane Erigeron elatus — tall bitter fleabane Erigeron evermannii — Evermann's fleabane Erigeron filifolius — threadleaf fleabane Erigeron flagellaris — running fleabane Erigeron formosissimus — beautiful fleabane Erigeron glabellus — smooth fleabane Erigeron grandiflorus — largeflower fleabane Erigeron humilis — low fleabane Erigeron hyperboreus — hyperboreal fleabane Erigeron hyssopifolius — daisy fleabane Erigeron lackschewitzii — front range fleabane Erigeron lanatus — woolly fleabane Erigeron leibergii — Leiberg's fleabane Erigeron linearis — linearleaf fleabane Erigeron lonchophyllus — short-ray fleabane Erigeron mexiae — Mex' fleabane Erigeron ochroleucus — buff fleabane Erigeron pallens — pale fleabane Erigeron peregrinus — foreign fleabane Erigeron philadelphicus — Philadelphia fleabane Erigeron poliospermus — hairyseed fleabane Erigeron pulchellus — robin's-plantain Erigeron pumilus — shaggy fleabane Erigeron purpuratus — purple fleabane Erigeron radicatus — tap-rooted fleabane Erigeron salishii — Salish's daisy Erigeron scotteri — Scotter's fleabane Erigeron speciosus — Aspen fleabane Erigeron strigosus — daisy fleabane Erigeron subtrinervis — three-nerve fleabane Erigeron uniflorus — one-flower fleabane Erigeron × arthurii Erigeron yukonensis — Yukon fleabane Eriophyllum lanatum — common woolly-sunflower Eucephalus engelmannii — Engelmann's aster Eucephalus paucicapitatus — olympic aster Eupatorium altissimum — tall boneset Eupatorium dubium — joe-pye thoroughwort Eupatorium fistulosum — hollow joe-pyeweed Eupatorium maculatum — spotted joe-pyeweed Eupatorium perfoliatum — common boneset Eupatorium purpureum — sweet joe-pyeweed Eupatorium × truncatum Eurybia conspicua — showy aster Eurybia divaricata — white wood-aster Eurybia macrophylla — largeleaf wood-aster Eurybia merita — arctic aster Eurybia pygmaea — pygmy wood-aster Eurybia radula — rough wood-aster Eurybia radulina — roughleaf aster Eurybia schreberi — Schreiber's aster Eurybia sibirica — Siberian aster Euthamia caroliniana — slender fragrant goldenrod Euthamia galetorum — narrowleaf fragrant goldenrod Euthamia graminifolia — flat-top fragrant goldenrod Euthamia gymnospermoides — viscid bushy goldenrod Euthamia occidentalis — western fragrant goldenrod Gaillardia aristata — great blanket-flower Gaillardia pulchella — firewheel blanket-flower Gamochaeta ustulata — featherweed Gnaphalium obtusifolium — fragrant cudweed Gnaphalium palustre — western marsh cudweed Gnaphalium viscosum — winged cudweed Grindelia hirsutula — hairy gumweed Grindelia integrifolia — Puget Sound gumweed Grindelia nana — Idaho gumweed Grindelia nuda — curly-top gumweed Grindelia squarrosa — broadleaf gumweed Grindelia stricta — Oregon gumweed Gutierrezia sarothrae — broom snakeweed Helenium autumnale — common sneezeweed Helianthella uniflora — Rocky Mountain rockrose Helianthus annuus — common sunflower Helianthus couplandii — Coupland's sunflower Helianthus decapetalus — thin-leaved sunflower Helianthus divaricatus — woodland sunflower Helianthus giganteus — tall sunflower Helianthus maximiliani — Maximillian's sunflower Helianthus nuttallii — Nuttall's sunflower Helianthus pauciflorus — stiff sunflower Helianthus petiolaris — prairie sunflower Helianthus strumosus — paleleaf sunflower Helianthus tuberosus — Jerusalem artichoke Helianthus × alexidis Helianthus × laetiflorus — hybrid prairie sunflower Helianthus × luxurians Heliopsis helianthoides — smooth oxeye Heterotheca villosa — hairy false goldenaster Hieracium albiflorum — whiteflower hawkweed Hieracium canadense — Canada hawkweed Hieracium cynoglossoides — hound's-tongue hawkweed Hieracium gracile — alpine hawkweed Hieracium groenlandicum — Greenland hawkweed Hieracium gronovii — hairy hawkweed

Hieracium kalmii — Kalm's hawkweed Hieracium laevigatum — smooth hawkweed Hieracium marianum — Maryland hawkweed Hieracium paniculatum — panicled hawkweed Hieracium plicatum — boreal hawkweed Hieracium robinsonii — Robinson's hawkweed Hieracium scabrum — rough hawkweed Hieracium scouleri — Scouler's hawkweed Hieracium triste — woolly hawkweed Hieracium umbellatum — umbellate hawkweed Hieracium venosum — rattlesnake hawkweed Hieracium × dutillyanum Hieracium × fassettii Hieracium × fernaldii Hieracium × flagellare Hieracium × grohii Hieracium × stoloniflorum Hymenopappus filifolius — fineleaf woolly-white Hymenoxys richardsonii — Richardson's bitterweed Ionactis linariifolius — flaxleaf aster Ionactis stenomeres — Rocky Mountain aster Iva axillaris — small-flowered marsh-elder Iva frutescens — bigleaf marsh-elder Jaumea carnosa — fleshy jaumea Krigia biflora — two-flower dwarf-dandelion Krigia virginica — Virginia dwarf-dandelion Lactuca biennis — tall blue lettuce Lactuca canadensis — Canada lettuce Lactuca floridana — woodland lettuce Lactuca hirsuta — hairy lettuce Lactuca ludoviciana — western lettuce Lactuca tatarica — Tartarian lettuce Lactuca terrae-novae — Newfoundland lettuce Lasthenia maritima — maritime goldfields Leucanthemum integrifolium — entire-leaf daisy Liatris aspera — tall gayfeather Liatris cylindracea — slender blazingstar Liatris ligulistylis — strapstyle gayfeather Liatris punctata — dotted gayfeather Liatris spheroidea — spherical gayfeather Liatris spicata — marsh blazingstar Liatris × creditonensis Liatris × gladewitzii Luina hypoleuca — littleleaf silverback Lygodesmia juncea — rush skeletonplant Machaeranthera canescens — hoary tansy-aster Machaeranthera grindelioides — western aster Machaeranthera pinnatifida — spiny goldenaster Madia exigua — little tarweed Madia glomerata — mountain tarweed Madia gracilis — grassy tarweed Madia madioides — woodland tarweed Madia minima — smallhead tarweed Matricaria discoidea — pineapple-weed chamomile Megalodonta beckii — Beck's water-marigold Microseris bigelovii — coast microseris Microseris borealis — northern microseris Microseris lindleyi — Lindley's silverpuffs Microseris nutans — nodding silverpuffs Mikania scandens — climbing hempweed Nothocalais cuspidata — prairie false-dandelion Nothocalais troximoides — weevil false-dandelion Oclemena acuminata — whorled aster Oclemena nemoralis — bog aster Oclemena × blakei — Blake's aster Oligoneuron album — prairie goldenrod Oligoneuron houghtonii — Houghton's goldenrod Oligoneuron ohioense — Ohio goldenrod Oligoneuron riddellii — Riddell's goldenrod Oligoneuron rigidum — stiff goldenrod Oligoneuron × bernardii Oligoneuron × krotkovii Oligoneuron × lutescens — upland aster Oligoneuron × maheuxii Omalotheca norvegica — Norwegian cudweed Omalotheca supina — alpine cudweed Omalotheca sylvatica — woodland cudweed Packera aurea — golden ragwort Packera cana — silvery ragwort Packera contermina — northwestern groundsel Packera cymbalaria — dwarf arctic groundsel Packera hyperborealis — boreal groundsel Packera indecora — plains ragwort Packera macounii — Siskiyou Mountains butterweed Packera moresbiensis — Queen Charlotte groundsel Packera obovata — roundleaf groundsel Packera ogotorukensis — Ogotoruk Creek groundsel Packera pauciflora — few-flower ragwort Packera paupercula — balsam ragwort Packera plattensis — prairie ragwort Packera pseudaurea — western golden groundsel Packera schweinitziana — Robbin's squawweed Packera streptanthifolia — cleftleaf ragwort Packera tridenticulata — three-tooth groundsel Petasites frigidus — arctic butterbur Petasites sagittatus — arrowleaf sweet colt's-foot Petasites × vitifolius Picradeniopsis oppositifolia — oppositeleaf false bahia Polymnia canadensis — whiteflower leafcup Prenanthes alata — western rattlesnake-root Prenanthes alba — white rattlesnake-root Prenanthes altissima — tall rattlesnake-root Prenanthes nana — dwarf rattlesnake-root Prenanthes racemosa — glaucous rattlesnake-root Prenanthes sagittata — arrowleaf rattlesnake-root Prenanthes trifoliolata — three-leaved rattlesnake-root Prenanthes × mainensis Pseudognaphalium canescens — Wright's cudweed Psilocarphus brevissimus — round woolly-heads Psilocarphus elatior — tall woolly-heads Psilocarphus tenellus — slender woolly-heads Pyrrocoma carthamoides — largeflower goldenweed Pyrrocoma lanceolata — lance-leaved goldenweed Pyrrocoma uniflora — plantain goldenweed Ratibida columnifera — upright prairie coneflower Ratibida pinnata — greyhead prairie coneflower Rudbeckia fulgida — orange coneflower Rudbeckia hirta — black-eyed susan Rudbeckia laciniata — cut-leaved coneflower Saussurea americana — American saw-wort Saussurea angustifolia — narrowleaf saw-wort Saussurea densa — clustered saw-wort Saussurea viscida — sticky saw-wort Senecio congestus — marsh ragwort Senecio cymbalarioides — cleftleaf groundsel Senecio elmeri — Elmer's ragwort Senecio eremophilus — desert groundsel Senecio fremontii — Fremont's ragwort Senecio hydrophiloides — sweet marsh ragwort Senecio hydrophilus — great swamp ragwort Senecio integerrimus — entire-leaf ragwort Senecio lugens — blacktip groundsel Senecio megacephalus — Nuttall's ragwort Senecio pseudoarnica — seabeach groundsel Senecio sheldonensis — Mount Sheldon groundsel Senecio triangularis — arrowleaf groundsel Sericocarpus rigidus — Curtus' aster Shinnersoseris rostrata — annual skeletonweed Silphium laciniatum — compass plant Silphium perfoliatum — cup-plant Silphium terebinthinaceum — prairie rosinweed Sinosenecio newcombei — Newcombe's groundsel Solidago altissima — tall goldenrod Solidago arguta — cutleaf goldenrod Solidago bicolor — white goldenrod Solidago caesia — bluestem goldenrod Solidago calcicola — rock goldenrod Solidago canadensis — Canada goldenrod Solidago cutleri — Cutler's goldenrod Solidago flexicaulis — broad-leaved goldenrod Solidago gigantea — smooth goldenrod Solidago hispida — hairy goldenrod Solidago juncea — early goldenrod Solidago latissimifolia — Elliott's goldenrod Solidago macrophylla — largeleaf goldenrod Solidago missouriensis — Missouri goldenrod Solidago mollis — ground goldenrod Solidago multiradiata — alpine goldenrod Solidago nemoralis — field goldenrod Solidago patula — roundleaf goldenrod Solidago puberula — downy goldenrod Solidago rugosa — roughleaf goldenrod Solidago sempervirens — seaside goldenrod Solidago simplex — sticky goldenrod Solidago speciosa — showy goldenrod Solidago squarrosa — squarrose goldenrod Solidago uliginosa — bog goldenrod Solidago ulmifolia — elmleaf goldenrod Solidago victorinii — Victorin's goldenrod Solidago × asperula Solidago × beaudryi Solidago × erskinei Solidago × luteus Solidago × raymondii Stenotus acaulis — stemless mock goldenweed Stenotus armerioides — thrift mock goldenweed Stenotus macleanii — MacLean's goldenweed Stephanomeria minor — narrowleaf skeletonplant Stephanomeria runcinata — desert skeletonplant Stephanomeria spinosa — thorny wire-lettuce Symphyotrichum anticostense — Anticosti aster Symphyotrichum ascendens — western aster Symphyotrichum boreale — boreal aster Symphyotrichum campestre — western meadow-aster Symphyotrichum ciliatum — alkali American-aster Symphyotrichum ciliolatum — Lindley's aster Symphyotrichum cordifolium — heartleaf aster Symphyotrichum dumosum — bushy aster Symphyotrichum eatonii — Eaton's aster Symphyotrichum ericoides — white heath aster Symphyotrichum falcatum — white prairie aster Symphyotrichum foliaceum — leafy-bracted aster Symphyotrichum frondosum — alkali aster Symphyotrichum hendersonii — Henderson's American-aster Symphyotrichum laeve — smooth blue aster Symphyotrichum lanceolatum — panicled aster Symphyotrichum lateriflorum — starved aster Symphyotrichum laurentianum — St. Lawrence aster Symphyotrichum novae-angliae — New England aster Symphyotrichum novi-belgii — longleaf aster Symphyotrichum ontarionis — Ontario aster Symphyotrichum oolentangiense — sky blue aster Symphyotrichum pilosum — white heath aster Symphyotrichum praealtum — willow aster Symphyotrichum prenanthoides — crooked-stem aster Symphyotrichum puniceum — swamp aster Symphyotrichum racemosum — small white aster Symphyotrichum robynsianum — Robyns' American-aster Symphyotrichum sericeum — western silvery aster Symphyotrichum shortii — Short's aster Symphyotrichum spathulatum — western mountain aster Symphyotrichum subspicatum — Douglas' aster Symphyotrichum subulatum — annual saltmarsh aster Symphyotrichum tradescantii — Tradescant's aster Symphyotrichum undulatum — wavyleaf aster Symphyotrichum urophyllum — white-arrow aster Symphyotrichum × amethystinum Symphyotrichum yukonense — Yukon aster Tanacetum bipinnatum — Lake Huron tansy Taraxacum carneocoloratum — pink dandelion Taraxacum eriophorum — wool-bearing dandelion Taraxacum lyratum — alpine dandelion Taraxacum officinale — common dandelion Taraxacum phymatocarpum — northern dandelion Tephroseris atropurpurea — dark purple groundsel Tephroseris kjellmanii — Kjellman's squawweed Tephroseris lindstroemii — twice-hairy groundsel Tephroseris yukonensis — Yukon groundsel Tetradymia canescens — grey horsebrush Tetraneuris acaulis — stemless four-nerve daisy Tetraneuris herbacea — lakeside daisy Thelesperma subnudum — border goldthread Tonestus lyallii — Lyall's haplopappus Townsendia condensata — cushion townsend-daisy Townsendia exscapa — silky townsend-daisy Townsendia hookeri — Hooker's townsend-daisy Townsendia parryi — Parry's townsend-daisy Tripleurospermum maritima — false chamomile Verbesina alternifolia — wingstem Vernonia fasciculata — fascicled ironweed Vernonia gigantea — giant ironweed Vernonia missurica — Missouri ironweed Xanthium strumarium — rough cocklebur

Aulacomniaceae

Aulacomnium acuminatum — acutetip aulacomnium moss Aulacomnium androgynum

Aulacomnium heterostichum Aulacomnium palustre — aulacomnium moss Aulacomnium turgidum

Aytoniaceae

Asterella gracilis Asterella lindenbergiana Asterella saccata Asterella tenella Mannia fragrans

Mannia pilosa Mannia sibirica Mannia triandra Reboulia hemisphaerica

Azollaceae

Azolla caroliniana — eastern mosquito-fern

Azolla mexicana — Mexican mosquito-fern