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Posey’s Rogues: A Gallery of Exotic Invasive and Non-invasive Plants of Alberta


Getting started

Have a name, and want to find information? Use the search function in the top right corner to find all references to either a common or scientific name.

Have a plant, and want to know what it is? At present all we can offer are the thumbnails in The Rogue's Portrait Galleries, below, which link to more information if you can find a picture that matches your plant.

Want to contribute? See Notes for Contributors.

Interested in Alberta weed regulations? See Act and Regulations or Weed regulation.

Consult the Mediawiki User's Guide for information on using the software. Try editing where it will do no harm, in the Sandbox

Posey’s Rogues Portrait Galleries

Some species have no pictures at all, and the gallery only has pictures that might be of help while browsing thumbnails for an unidentified plant. On individual species pages (accessed from the list of species below) there are additional pictures.

List of species

Plant species regulated by Alberta's Weed Control Act are listed on page 7 of the WEED CONTROL REGULATION. [1]

The species in the table below are generally listed as invasive by one or more authorities. All are alien in Alberta, unless noted otherwise (some native species are included to differentiate them from similar exotics). Many additional species are regarded as weeds --- alien species known to occur in Alberta (but not known to be invasive), or native species regarded as pests in agricultural settings. Some native species can be invasive (e.g. Aspen incursion into grassland) when not limited by historic disturbance regimes, but they are not listed here.

in alphabetical order by scientific name
Common Name 'Scientific Name' Family
velvet-leaf Abutilon theophrasti Medik. Malvaceae
Manitoba maple Acer negundo L. Aceraceae
Norway maple Acer platanoides L. Aceraceae
yarrow Achillea millefolium L. var. millefolium Asteraceae
jointed goatgrass Aegilops cylindrica Host Poaceae
goutweed Aegopodium podagraria L. Apiaceae
crested wheatgrass Agropyron pectiniforme (Bieb.) Tzvelev Poaceae
quack grass Agropyron repens (L.) P. Beauv. Poaceae
creeping bentgrass Agrostis stolonifera L. Poaceae
garlic mustard Alliaria petiolata (Bieb.) Cavara & Grande Brassicaceae
creeping meadow foxtail Alopecurus arundinaceus Poir. Poaceae
slender foxtail Alopecurus myosuroides Huds. Poaceae
meadow foxtail Alopecurus pratensis L. Poaceae
red-root pigweed Amaranthus retroflexus L. Amaranthaceae
ragweed Ambrosia artemisiifolia L. Asteraceae
Amur peppervine Ampelopsis brevipedunculata (Maxim.) Trautv. Vitaceae
yellow chamomile Anthemis tinctoria L. Asteraceae
wild chervil Anthriscus sylvestris (L.) Hoffm. Apiaceae
great burdock Arctium lappa L. Asteraceae
common Burdock Arctium minus Bernh. Asteraceae
woolly burdock Arctium tomentosum P. Mill. Asteraceae
European (woodland) burdock Arctium vulgare (Hill) Evans Asteraceae
absinth Artemisia absinthium L. Asteraceae
cicer milkvetch Astragalus cicer L. Fabaceae
spear Saltbush Atriplex patula L. Chenopodiaceae
wild Oat Avena fatua L. Poaceae
5-horn smotherweed Bassia hyssopifolia (Pall.) Kuntze Chenopodioideae
Kochia Bassia scoparia (L.) A.J. Scott Chenopodioideae
Smotherweeds Bassia spp. Chenopodioideae
Japanese barberry Berberis thunbergii L. Berberidaceae
European or common barberry Berberis vulgaris L. Berberidaceae
hoary-alyssum Berteroa incana (L.) DC. Brassicaceae
yellow bluestem Bothriochloa ischaemum (L.) Keng Poaceae
smooth brome Bromus inermis var. inermis L. Poaceae
Japanese chess Bromus japonicus Thunb. ex Murr. Poaceae
cheatgrass Bromus tectorum L. Poaceae
flowering-rush Butomus umbellatus L. Butomaceae
big-seed false flax Camelina sativa (L.) Crantz Brassicaceae
creeping bellflower Campanula rapunculoides L. Campanulaceae
shepherd's-purse Capsella bursa-pastoris (L.) Medik. Brassicaceae
caragana or Siberian peashrub Caragana arborescens Lam. Fabaceae
hoary cress, whitetop Cardaria spp. Desv. Brassicaceae
plumeless thistle Carduus acanthoides L. Asteraceae
nodding thistle Carduus nutans L. Asteraceae
Safflower Carthamnus tinctorius L. Asteraceae
caraway Carum carvi L. Apiaceae
Japanese bittersweet Celastrus orbiculatus Thunb. Celastraceae
diffuse knapweed Centaurea diffusa Lam. Asteraceae
brown knapweed Centaurea jacea L. Asteraceae
bighead knapweed Centaurea macrocephala Puschk. ex Willd. Asteraceae
mountain knapweed Centaurea montana L. Asteraceae
black knapweed Centaurea nigra L. Asteraceae
Tyrol knapweed Centaurea nigrescens Willd. Asteraceae
Russian knapweed Centaurea repens (L.) DC. Asteraceae
yellow starthistle Centaurea solstitialis L. Asteraceae
spotted knapweed Centaurea stoebe L. ssp. micranthos (Gugler) Hayek Asteraceae
squarrose knapweed Centaurea virgata Lam. ssp. squarrosa (Willd.) Gugler Asteraceae
meadow knapweed Centaurea x moncktonii C. E. Britton Asteraceae
hybrid knapweed Centaurea x psammogena Gáyer Asteraceae
chickweed Cerastium vulgatum L. Caryophyllaceae
celandine Chelidonium majus L. Papaveraceae
lamb's-quarters Chenopodium album L. Chenopodioideae
rush skeletonweed Chondrilla juncea L. Asteraceae
creeping thistle Cirsium arvense (L.) Scop. Asteraceae
marsh thistle Cirsium palustre (L.) Scop. Asteraceae
bull thistle Cirsium vulgare (Savi) Ten. Asteraceae
yellow clematis* Clematis tangutica (Maxim.) Korsh. Ranunculaceae
evergreen clematis Clematis vitalba L. Ranunculaceae
poison hemlock Conium maculatum L. Apiaceae
field bindweed* Convolvulus arvensis L. Convolvulaceae
crown vetch Coronilla varia L. Fabaceae
Peking cotoneaster Cotoneaster acutifolius Turcz. Rosaceae
red-fruited cotoneaster Cotoneaster integerrimus Medik. Rosaceae
dark-seed cotoneaster Cotoneaster niger (Thunb.) Fries Rosaceae
annual hawksbeard Crepis tectorum L. Asteraceae
common crupina* Crupina vulgaris Pers. ex Cass. Asteraceae
dodder Cuscuta spp. L. Convolvulaceae
European swallow-wort Cynanchum rossicum (Kleopow) Borhidi Asclepiadaceae
black swallow-wort Cynanchum louiseae (L.) Kartesz & Gandhi Asclepiadaceae
hound's-tongue* Cynoglossum officinale L. Boraginaceae
Hedgehog dogtail Cynosurus echinatus L. Poaceae
yellow nutsedge* Cyperus esculentus L. Cyperaceae
Scotch broom Cytisus scoparius (L.) Link Fabaceae
orchardgrass Dactylis glomerata L. Poaceae
jimson weed, Chinese thorn-apple Datura sp. L. Solanaceae
wild carrot, Queen Anne’s lace Daucus carota L. Apiaceae
flixweed or tansy mustard Descurainia sophia (L.) Webb ex Prantl Brassicaceae
fuller's or common teasel Dipsacus fullonum L. Caprifoliaceae
Chinese yam Dioscorea polystachya Turcz. Dioscoreaceae
fetid marigold Dyssodia papposa (Vent.) Hitchc. Asteraceae
barnyard grass Echinochloa crusgalli (L.) Beauv. Poaceae
wild cucumber Echinocystis lobata (Michx.) Torr. & Gray Cucurbitoideae
globe thistle Echinops sp. L. Asteraceae
blueweed* Echium vulgare L. Boraginaceae
Russian olive Elaeagnus angustifolia L. Elaeagnaceae
autumn olive* Elaeagnus umbellata Thunb. Elaeagnaceae
woolly cupgrass Eriochloa villosa (Thunb.) Kunth Poaceae
California filaree Erodium cicutarium (L.) L'Hér. ex Aiton Geraniaceae
dog mustard Erucastrum gallicum (Willd.) O.E. Schulz Brassicaceae
sea holly Eryngium planum L. Apiaceae
wormseed mustard Erysimum cheiranthoides L. Brassicaceae
cypress spurge Euphorbia cyparissias L. Euphorbiaceae
leafy spurge* Euphorbia esula L. Euphorbiaceae
myrtle spurge Euphorbia myrsinites L. Euphorbiaceae
Tartary buckwheat Fagopyrum tataricum (L.) Gaertn. Polygonaceae
Japanese knotweed* Fallopia japonica (Houtt.) Ronse Decr. Polygonaceae
giant knotweed* Fallopia sachalinensis (F. Schmidt ex Maxim.) Ronse Decr. Polygonaceae
hybrid Japanese knotweed* Fallopia x bohemica (Chrtek & Chrtková) J. P. Bailey Polygonaceae
creeping red fescue Festuca rubra L. Poaceae
glossy buckthorn Frangula alnus Mill. Rhamnaceae
green ash Fraxinus pennsylvanica Marshall Oleaceae
goat's rue Galega officinalis L. Fabaceae
hemp nettle Galeopsis tetrahit L. Lamiaceae
cleavers Galium aparine L. Rubiaceae
sweet woodruff Galium odoratum (L.) Scop. Rubiaceae
false cleavers Galium spurium L. Rubiaceae
Yellow bedstraw Galium verum L. Rubiaceae
yellow gentian Gentiana lutea L. Gentianaceae
reed mannagrass Glyceria maxima (Hartm.) Holmb. Poaceae
baby's-breath Gypsophila paniculata L. Caryophyllaceae
Showy baby's-breath Gypsophila elegans M. Bieb. Caryophyllaceae
saltlover Halogeton glomeratus (M. Bieb.) C.A. Mey. Amaranthaceae
giant hogweed Heracleum mantegazzianum Sommier & Levier Apiaceae
dame's rocket Hesperis matronalis L. Brassicaceae
orange hawkweed Hieracium aurantiacum L. Asteraceae
meadow hawkweed Hieracium caespitosum Dumort. Asteraceae
mouse-ear hawkweed Hieracium pilosella L. Asteraceae
tall hawkweed Hieracium piloselloides Vill. Asteraceae
sea buckthorn Hippophae rhamnoides L. Elaeagnaceae
waterthyme, hydrilla Hydrilla verticillata (L. f.) Royle Hydrocharitaceae
European frog's-bit Hydrocharis morsus-ranae L. Hydrocharitaceae
black henbane Hyoscyamus niger L. Solanaceae
klamath weed Hypericum perforatum L. Hypericaceae
Himalayan balsam Impatiens glandulifera L. Balsaminaceae
yellow flag iris Iris pseudacorus L. Iridaceae
dyer's woad Isatis tinctoria L. Brassicaceae
tansy ragwort Jacobaea vulgaris Gaertn. Asteraceae
field scabious Knautia arvensis (L.) J.M. Coult. Caprifoliaceae
henbit or dead nettle Lamium amplexicaule L. Lamiaceae
blue-bur Lappula squarrosa (Retz.) Dumort. Boraginaceae
globe-podded hoary cress Lepidium appelianum Al-Shehbaz Brassicaceae
field pepperweed Lepidium campestre (L.) W.T. Aiton Brassicaceae
lens-podded hoary cress Lepidium chalepense L. Brassicaceae
heart-podded hoary cress Lepidium draba L. Brassicaceae
perennial peppergrass Lepidium latifolium L. Brassicaceae
Chinese bush-clover Lespedeza cuneata (Dum. Cours.) G. Don Fabaceae
ox-eye daisy Leucanthemum vulgare Lam. Asteraceae
Dalmatian toadflax Linaria dalmatica (L.) Mill. Plantaginaceae
toadflax Linaria vulgaris Mill. Plantaginaceae
Persian darnel Lolium persicum Boiss. & Hohen. ex Boiss. Poaceae
Tatarian honeysuckle Lonicera tatarica L. Caprifoliaceae
bird's-foot trefoil Lotus corniculatus L. Fabaceae
Maltese cross Lychnis chalcedonica L. Caryophyllaceae
purple loosestrife* Lythrum salicaria L. Lythraceae
round-leaved mallow Malva rotundifolia L., nom. utique rej. Malvaceae
high mallow Malva sylvestris L. Malvaceae
low mallow Malva pusilla Sm. Malvaceae
scentless chamomile Matricaria perforata
black medick Medicago lupulina L. Fabaceae
alfalfa Medicago sativa L. Fabaceae
white sweetclover Melilotus albus Medik. Fabaceae
yellow sweetclover Melilotus officinale (L.) Lam. Fabaceae
Japanese stiltgrass Microstegium vimineum (Trin.) A. Camus Poaceae
spring millet grass Milium vernale M. Bieb. Poaceae
Eurasian water-milfoil Myriophyllum spicatum L. Haloragaceae
watercress Nasturtium officinale L. Brassicaceae
catnip Nepeta cataria L. Lamiaceae
ball mustard Neslia paniculata L. Brassicaceae
red bartsia Odontites vernus (Bellardi) Dumort. Orobanchaceae
sainfoin Onobrychis viciifolia Scop. Fabaceae
Scotch cottonthistle Onopordum acanthium L. Asteraceae
blindeyes Papaver dubium L. Papaveraceae
corn poppy Papaver rhoeas L. Papaveraceae
parsnip Pastinaca sativa L. Apiaceae
African rue Peganum harmala L. Nitrariaceae
reed canary grass Phalaris arundinacea L. Poaceae
timothy Phleum pratense L. Poaceae
common reed Phragmites australis (Cav.) Trin. ex Steud. Poaceae
Norway spruce Picea abies(L.) Karst. Pinaceae
Burnet-saxifrage Pimpinella saxifraga L. Apiaceae
Scotch pine Pinus sylvestris L. Pinaceae
common plantain, whiteman's foot Plantago major L. Plantaginaceae
hoary plantain Plantago media L. Plantaginaceae
Canada bluegrass Poa compressa L. Poaceae
Kentucky bluegrass Poa pratensis L. Poaceae
common or yard knotweed Polygonum arenastrumJord. ex Boreau Polygonaceae
Wild Buckwheat Polygonum convolvulus L. Polygonaceae
tearthumb, mile-a-minute vine Polygonum perfoliatum L. Polygonaceae
lady's-thumb Polygonum persicaria L. Polygonaceae
Himalayan knotweed Polygonum polystachyum Wall. ex Meisn. Polygonaceae
white poplar Populus alba L. Salicaceae
curly pondweed Potamogeton crispus L. Potamogetonaceae
sulphur cinquefoil Potentilla recta L. Rosaceae
sulphur cinquefoil* Potentilla recta L. Rosaceae
kudzu Pueraria montana (Lour.) Merr. Fabaceae
tall buttercup* Ranunculus acris L. Ranunculaceae
creeping buttercup Ranunculus repens L. Ranunculaceae
wild radish Raphanus raphanistrum L. Brassicaceae
common buckthorn* Rhamnus cathartica L. Rhamnaceae
Russian knapweed* Rhaponticum repens (L.) Hidalgo Asteraceae
curled dock Rumex crispus L. Polygonaceae
yard dock Rumex longifolius D.C. Polygonaceae
Russian thistle Salsola kali L. Chenopodioideae
prickly Russian thistle Salsola tragus L. Chenopodioideae
elderberry Sambucus racemosa L. Adoxaceae
tall fescue Schedonorus arundinaceus (Schreb.) Dumort., nom. cons. Poaceae
knawel Scleranthus annuus L. Caryophyllaceae
crown vetch Securigera varia (L.) Lassen Fabaceae
tansy ragwort Senecio jacobaea L. Asteraceae
green foxtail Setaria viridis (L.) P. Beauv. Poaceae
white campion Silene latifolia Poir. ssp. alba (Miller) Greuter & Burdet Caryophyllaceae
Balkan catchfly Silene cserei Baumg. Caryophyllaceae
night-flowering catchfly Silene noctiflora L. Caryophyllaceae
milk thistle Silybum marianum L. Asteraceae
corn mustard Sinapis arvensis L. Brassicaceae
tumbling mustard Sisymbrium altissimum L. Brassicaceae
small tumbleweed mustard Sisymbrium loeselii L. Brassicaceae
bittersweet nightshade Solanum dulcamara L. Solanaceae
silverleaf nightshade Solanum elaeagnifolium Cav. Solanaceae
carpet burrweed Soliva sessilis Ruiz & Pav. Asteraceae
perennial sow thistle* Sonchus arvensis L. Asteraceae
perennial sow thistle Sonchus arvensis L. ssp. uliginosus (M. Bieb.) Nyman Asteraceae
spiny sow thistle Sonchus asper (L.) Hill Asteraceae
annual sow thistle Sonchus oleraceus L. Asteraceae
European mountain ash Sorbus aucuparia L. Rosaceae
aleppo grass Sorghum halepense (L.) Pers. Poaceae
corn spurry Spergula arvensis L. Caryophyllaceae
alkali swainsonpea Sphaerophysa salsula (Pall.) DC. Fabaceae
common chickweed Stellaria media (L.) Vill. Caryophyllaceae
Japanese lilac Syringa reticulata (Blume) H. Hara Oleaceae
lilac Syringa vulgaris L. Oleaceae
medusahead* Taeniatherum caput-medusae (L.) Nevski Poaceae
Chinese tamarisk* Tamarix chinensis Lour. Tamaricaceae
smallflower tamarisk Tamarix parviflora DC. Tamaricaceae
saltcedar* Tamarix ramosissima Ledeb. Tamaricaceae
common tansy* Tanacetum vulgare L. Asteraceae
dandelion Taraxacum officinale F.H. Wigg. Asteraceae
thesium Thesium arvense Horv. Santalaceae
stinkweed Thlaspi arvense L. Brassicaceae
goat's-beard Tragopogon dubius Scop. Asteraceae
puncturevine* Tribulus terrestris L. Zygophyllaceae
Alsike clover Trifolium hybridum L. Fabaceae
red Clover Trifolium pratense L. Fabaceae
white Clover Trifolium repens L. Fabaceae
clovers Trifolium spp. L. Fabaceae
scentless chamomile* Tripleurospermum inodorum (L.) Sch. Bip. Asteraceae
cattails Typha spp. L. Typhaceae
Siberian elm Ulmus pumila L. Ulmaceae
cow soapwort, Vaccaria hispanica (Mill.) Rauschert Caryophyllaceae
common mullein* Verbascum thapsus L. Scrophulariaceae
European highbush cranberry Viburnum opulus L. var. opulus Caprifoliaceae
one-sided vetch Vicia cracca L. Fabaceae
European field pansy Viola arvensis Murray Violaceae
rattail fescue Vulpia myuros (L.) C.C. Gmel. Poaceae
Syrian bean-caper Zygophyllum fabago L. Zygophyllaceae

Subregional Aliens

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