Proposed Revisions to the Weed Act Regulations

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Suggested criteria for Prohibited Noxious (rank 3) and Noxious (rank 2) classification

Common Name Scientific Name Old Rank (1, 2, or 3) New Rank (2 or 3) Remarks
Velvet-leaf Abutilon theophrasti 0 0
Manitoba Maple Acer negundo 0 0 Native prior to settlement, but rare. Domestic plantings are more common.
Norway Maple Acer platanoides 0 0
Yarrow Achillea millefolium var. millefolium 0 0 Taxonomy of A. millefolium is not clear and it's not easy to separate native from introduced populations. Flora of North America treats it all as a single variable species (Alec).
Goutweed Aegopodium podagraria 0 0
Crested Wheatgrass Agropyron pectiniforme (A. cristatum) 0 1 or 2 OK for cultivated pasture if not near natural areas, control elsewhere (Jim). Very persistent where planted, does not seem to spread rapidly (Alec).
Quack Grass Agropyron repens 1 1
Creeping Bentgrass Agrostis stolonifera 0 0
Garlic Mustard Alliaria petiolata 0 0 I think there is climatic modelling suggesting that this is not a big threat in AB (Alec).
Meadow Foxtail Alopecurus pratensis 0 0
Red-root Pigweed Amaranthus retroflexus 1 1 Annual weed of disturbed/cultivated land, very widespread in AB. Not worth listing? (Alec.)
Ragweed Ambrosia artemisiifolia 0 0
Amur Peppervine Ampelopsis brevipedunculata 0 0
Yellow Chamomile Anthemis tinctoria 0 0
Wild Chervil Anthriscus sylvestris 0 0 in BC, WA, ID
Spreading dogbane Apocynum androsaemifolium 2 0 or 1 Native, should not be controlled in native contexts. Does anyone know in what agricultural context it's a problem and if it should be listed at all?
Great Burdock Arctium lappa 0 0
Common Burdock Arctium minus 0 1
Wooley Burdock Arctium tomentosum 0 0
European Burdock Arctium vulgare 0 0
Absinth Artemisia absinthium 0 0
Cicer Milkvetch Astragalus cicer 0 2 Should allow under cultivation, but control or eradicate elsewhere, roadsides &c as well as natural areas
Wild Oat Avena fatua 1 1
5-Hook Bassia, 5-Horn Smotherweed Bassia hyssopifolia 0 0
Japanese Barberry Berberis thunbergii 0 0
Hoary-alyssum Berteroa incana 0 0
Smooth Brome Bromus inermis var. inermis 0 1-2 OK for cultivated pasture if not near natural areas. Treat as a 1 in most native habitats and as a 2 in the few native areas where it is still uncommon, including adjoining roads and trails.
Japanese Chess Bromus japonicus 0 1
Cheatgrass Bromus tectorum 1 2
Flowering-rush Butomus umbellatus 0 2 still uncommon, but may not remain so.
Hedge Bindweed Calystegia sepium (L.) R. Br. ssp. angulata Brummitt or Calystegia sepium (L.) R. Br. ssp. americana (Sims) Brummitt or both? 2 0 Are these not native? Not important problems as far as I know (Alec.) It's called Convolvulus sepium on the current AB Complete Element List and is considered native, ranked S3 (ANPC via Jim) Yes I believe all Calystegia are now treated as Convolvulus so this is the correct name (Alec).
Creeping Bellflower, Garden Harebell Campanula rapunculoides 1 2
Shepherd's-purse Capsella bursa-pastoris 1 1 Annual weed of disturbed/cultivated land, very widespread in AB. Not worth listing? (Alec.)
Caragana or Siberian Peashrub Caragana arborescens 0 2 at least 2 in native context
Hoary Cress or Whitetop Cardaria sp. 0 0 Can we be specific? Is this referring to C. chalepensis, C. draba, and C. pubescens? Are any/all of them problematic? (ANPC via Jim) The accepted names for these are now Lepidium chalepense, Lepidium draba, and Lepidium appelianum respectively. They are quite significant weeds in the western US although I don't know the relative importance of the 3 spp. (Alec).
Nodding Thistle Carduus nutans 3 3
Caraway Carum carvi 0 2 Spreading rapidly in the foothills (Alec).
Japanese Bittersweet Celastrus orbiculatus (C. orbiculata) 0 0
Diffuse Knapweed Centaurea diffusa 3 3
Spotted Knapweed Centaurea maculosa (C. biebersteinii) 3 3 (Oops! My mistake, listing it as a 0, Jim)
Russian Knapweed Centaurea repens 2 2
Yellow Starthistle Centaurea solstitialis 3 3
Field Chickweed Cerastium arvense ssp. strictum 1 0 or 1 This subspecies is native. Current reg is not clear what is intended. If listed, should be exempt in native context. ssp. arvense is introduced to NA but not known to be in AB.
Chickweed Cerastium vulgatum (C. fontanum ssp. vulgare) 1 1
Lamb's-quarters Chenopodium album 0 0 Annual weed of disturbed/cultivated land, very widespread in AB. Not worth listing? (Alec.)
Rush Skeletonweed Chondrilla juncea 0 0 Known here yet?
Ox-eye Daisy Chrysanthemum leucanthemum 2 2
Creeping Thistle Cirsium arvense 2 2
Marsh Thistle Cirsium palustre 0 3 spreading rapidly in wetlands in BC, no effective control available - good candidate for prohibited noxious (Alec).
Bull Thistle Cirsium vulgare 0 1
Yellow Clematis Clematis tangutica 0 1 or 2 Possible 3 - I think this is a major threat to mountain habitats (Alec.)
Evergreen Clematis Clematis vitalba 0 0 Mainly a W. European species - would it be hardy here? (Alec).
Hemlock Conium maculatum 0 0
Field Bindweed Convolvulus arvensis 2 2
Crown Vetch Coronilla varia 0 0
Peking Cotoneaster Cotoneaster acutifolia (C. acutifolius) 0 0
Red-fruited Cotoneaster Cotoneaster integerrimus 0 0
Dark-seed Cotoneaster Cotoneaster niger (C. melanocarpa) 0 0
Annual Hawksbeard Crepis tectorum 1 1
Common Crupina Crupina vulgaris 0 0
Dodder Cuscuta ssp. 3 0 Cuscuta gronovii is a rare native, but introduced species could be present and ranked differently--- does anyone know what was the target species (since the regs don't say?) the most possible exotics are 3 that occur in BC: small-seed alfalfa dodder (C. approximata), button-bush dodder (C. cephalanthi), and clover dodder (C. epithymum)(ANPC via Jim)
Hound's-tongue Cynoglossum officinale 2 2
Scotch Broom Cytisus scoparius 0 0 Probably not hardy in AB? (Alec).
Jimson Weed, Chinese Thorn-apple Datura sp. 0 0
Green tansy mustard Descurainia pinnata 1 0 native
Flixweed, Tansy Mustard Descurainia sophia 1 0 Annual weed of disturbed/cultivated land, very widespread in AB. Not worth listing? (Alec.)
Common Teasel, Fuller's Teasel Dipsacus fullonum 0 1
Blue Devil Echium vulgare 2 2
Russian Olive Elaeagnus angustifolia 0 1 maybe OK in cultivation in Northern watersheds
Autumn Olive Elaeagnus umbellata 0 0
California Filaree Erodium cicutarium 2 2
Dog Mustard Erucastrum gallicum 1 1
Wormseed Mustard Erysimum cheiranthoides ssp. cherianthoides 1 1 introduced
Wormseed Mustard Erysimum cheiranthoides ssp. altum 1 0 native
Cypress Spurge Euphorbia cyparissias 2 0 I've never heard of this as a serious problem in AB (Alec). (Nor have we, ANPC via Jim)
Leafy Spurge Euphorbia esula 2 2
Tartary Buckwheat Fagopyrum tataricum 1 1
Japanese Bamboo, J. Knotweed Fallopia japonica (Polygonum cuspidatum) 0 1
Creeping Red Fescue Festuca rubra 0 0
Green Ash Fraxinus pennsylvanica 0 1
Hemp Nettle Galeopsis tetrahit 1 1
Cleavers Galium aparine 2 2
Sweet Woodruff Galium odoratum 0 0
False Cleavers Galium spurium 2 2
Yellow Gentian Gentiana lutea 0 0
Great Manna Grass Glyceria maxima 0 0
Baby's-breath Gypsophila paniculata 0 1 or 2 in native SE AB?
Giant Hogweed Heracleum mantegazzianum 0 0
Dame's rocket Hesperis matronalis 0 1
Orange Hawkweed Hieracium aurantiacum 0 2 upgrade to 3 in yet-to-be infested regions?
Sea Buckthorn Hippophae rhamnoides 0 1 or 2
European Frog's-bit Hydrocharis morsus-ranae 0 0
Black Henbane Hyoscyamus niger 0 2 should be 3 in urban areas
St John's wort, Klamath weed Hypericum perforatum 0 3 Rate 3 because almost unknown here so far?
Himalayan Balsam Impatiens glandulifera 0 1 2 or 3 in natural areas (Jim)> Still only a few sites known in AB so could be a good candidate for 3 (Alec).
Yellow Flag Iris pseudacorus 0 0 Spreading in BC and occurs in quite continental climates in Europe. As a wetland plant this would be difficult to eradicate once it got established. Possible 3? (Alec).
Blue Buttons, Field Scabious Knautia arvensis 2 2
Summer Cypress, Burning Bush Kochia scoparia (Bassia scoparia) 0 0 Annual weed of disturbed/cultivated land, very widespread in AB. Not worth listing? (Alec.)
Henbit, Dead Nettle Lamium amplexicaule 1 1
Blue-bur Lappula occidentalis (L.echinata) 1 1
Perennial Peppergrass Lepidium latifolium (Cardaria latifolium) 2 (as Cardaria spp.) 2 Why is the whole genus listed? (Jim) Cardaria has been merged into Lepidium (see comments above under Cardaria) and there are native Lepidiums so the species need to be listed individually. L. latifolium is a significant weed in the western US (Alec.).
Chinese bush-clover Lespedeza cuneata 0 0
Dalmatian Toadflax Linaria dalmatica 1 1
Toadflax Linaria vulgaris 2 2
Persian Darnel Lolium persicum 2 2
Tatarian honeysuckle Lonicera tatarica 0 1
Maltese Cross Lychnis chalcedonica 0 1 Seems to spread very slowly in the few sites where it is established and is not known as a weed elsewhere (Alec).
Purple Loosestrife, Including Morden Pink Lythrum salicaria 2 2
Running Cheeseweed Malva rotundifolia 1 1
High Mallow Malva sylvestris 0 0
Scentless Chamomille Matricaria perforata (Tripleurospermum perforata) 2 2
Black Medick Medicago lupulina 0 1
Alfalfa Medicago sativa 0 1 spreading in native rangelands, causes bloat
White Sweetclover Melilotus alba 0 1 still used as forage? Maybe should be 2 in natural areas, rangeland, and adjoining roads
Yellow Sweetclover Melilotus officinale 0 1 still used as forage? Maybe should be 2 in natural areas, rangeland, and adjoining roads
Wild Four O'clock Mirabilis nyctaginea 0 0
Eurasian Water-milfoil Myriophyllum spicatum var. muricatum 3 3
Catnip Nepeta cataria 0 2 in natural areas
Ball Mustard Neslia paniculata 1 1
Red bartsia Odontites serotina 3 3
Sainfoin Onobrychis viciifolia 0 0
Parsnip Pastinaca sativa 0 0
African Rue Peganum harmala 0 0
Reed Canary Grass Phalaris arundinacea 0 1 or 2
Timothy Phleum pratense 0 0
Common Reed Phragmites australis (P. communis) 0 0
Norway Spruce Picea abies 0 0
Scotch Pine Pinus sylvestris 0 0
Common Plantain, Whiteman's Foot Plantago major 0 0
Canada blue grass Poa compressa 0 0
Kentucky Bluegrass Poa pratensis 0 1 or 2 in natural areas and rangeland
Common or Yard Knotweed Polygonum arenastrum 0 0 Annual weed of disturbed/cultivated land, very widespread in AB. Not worth listing? I think the taxonomy of this group is also very unclear with both native and introduced species involved (Alec.)
Wild Buckwheat Polygonum convolvulus 1 1 Annual weed of disturbed/cultivated land, very widespread in AB. Not worth listing? (Alec.)
Tearthumb, Mile-a-minute Vine Polygonum perfoliatum 0 0
Lady's-thumb Polygonum persicaria 1 1
White Poplar Populus alba 0 0
Curly Pondweed Potamogeton crispus 0 0
Rough cinquefoil Potentilla norvegica 1 0 native
Sulphur Cinquefoil Potentilla recta 0 1
Tall Buttercup Ranunculus acris 2 2
Creeping Buttercup Ranunculus repens 0 0
Wild Radish Raphanus raphanistrum 1 1
Common Buckthorn Rhamnus cathartica 0 0 Possible 3 (Alec).
Glossy Buckthorn Rhamnus frangula (Frangula alnus) 0 0 Possible 3 (Alec).
Curled Dock Rumex crispus 0 0
Yard Dock Rumex longifolius (R. domesticus) 0 0
Russian Tumbleweed Salsola pestifer (S. tragus) 1 1
Elderberry Sambucus racemosa var. pubens 0 0
Cowcockle Saponaria vaccaria (Vaccaria hispanica) 1 1 Under study as a crop ("prairie carnation") (Alec).
Knawel Scleranthus annuus 2 2 is this ever a problem - I don't ever recall hearing it discussed (Alec).
Tansy Ragwort Senecio jacobaea 0 0 Not sure if this is hardy in Alberta (Alec)
Green Foxtail Setaria viridis 1 1 Annual weed of disturbed/cultivated land, very widespread in AB. Not worth listing? (Alec.)
White Campion Silene alba (S. latifolia ssp. alba) 2 2
Balkan Catchfly Silene cserei 1 1
Bladder Campion Silene cucubalus 2 2
Night-flowering Catchfly Silene noctiflora 1 1
Milk Thistle Silybum marianum 0 0
Corn Mustard Sinapis arvensis 2 2 Annual weed of disturbed/cultivated land, very widespread in AB. Not worth listing? (Alec.)
Tumbling Mustard Sisymbrium altissimum 0 0
Perennial Sow Thistle Sonchus arvensis 2 2
Spiny Sow Thistle Sonchus asper 0 1
Annual Sow Thistle Sonchus oleraceus 1 1
Perennial Sow Thistle Sonchus uliginosa 0 1
European Mountain Ash Sorbus aucuparia 0 0
Aleppo grass Sorghum halepense 0 0
Corn Spurry Spergula arvensis 1 1
Common Chickweed Stellaria media 1 1
Japanese Lilac Syringa reticulata 0 1 in natural areas
Lilac Syringa vulgaris 0 0
Saltcedar, Tamarisk Tamarix ramosissima 0 3 so uncommon, maybe there's hope
Tansy Tanacetum vulgare 2 2
Dandelion Taraxacum officinale 1 1 is there any point?
Stinkweed Thlaspi arvense 1 1 Annual weed of disturbed/cultivated land, very widespread in AB. Not worth listing? (Alec.)
Goat's-beard Tragopogon dubius 0 0
Alsike Clover Trifolium hybridum 0 1 in natural areas
Red Clover Trifolium pratense 0 1 in natural areas
White Clover Trifolium repens 0 1 in natural areas
Clovers Trifolium sp. 0 1 in natural areas
Siberian Elm Ulmus pumila 0 0
Mullein Verbascum thapsus 0 2 A serious problem in the Montane. In CO Rocky Mtns it's ubiquitous. (ANPC, Jim)
European Highbush Cranberry Viburnum opulus, but not ssp. trilobum 0 0
One-sided Vetch Vicia cracca 0 2
Rattail Fescue Vulpia myuros (Festuca myuros) 0 0