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Please observe these rules:

  1. Only add comments (or revise your own comments), don't change anything else.
  2. Precede each comment you add with an asterisk.
  3. End each comment with three tildes in a row. (Some comments survive from a previous version, by James B. Posey (Jim) and Alec McClay (Alec))
  4. Use PRO to abbreviate "prohibited" and NOX for "noxious".
  5. If you are using criteria other than the AIPC recommended criteria, explain what they are and your reasons for using them.

Velvet-leaf Abutilon theophrasti

Manitoba Maple Acer negundo

Native prior to settlement, but rare. Domestic plantings are more common.

Norway Maple Acer platanoides

Exotic, not in ANHIC. USDA says it occurs in BC, ON (and points east) and can be invasive.

Yarrow Achillea millefolium var. millefolium

A. millefolium is listed as native by ANHIC but includes invasive exotic elements. USDA says var. millefolium is introduced in AB and can be weedy or invasive.

  • 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).

Sneezewort Yarrow, Sneezeweed Achillea ptarmica

Goutweed Aegopodium podagraria

Exotic, not listed by ANHIC. USDA shows in BC and SK, and says it can be invasive.

Crested Wheatgrass Agropyron pectiniforme (A. cristatum)

  • OK for cultivated pasture if not near natural areas, control elsewhere James B Posey.
  • Very persistent where planted, does not seem to spread rapidly (Alec).

Agropyron sibericum

Quack Grass Agropyron repens

Elytrigia repens in ANHIC

Creeping Bentgrass Agrostis stolonifera

Garlic Mustard Alliaria petiolata

Exotic, not listed by ANHIC. USDA shows it in BC and ON (and points east). Seriously invasive where it occurs.

  • I think there is climatic modelling suggesting that this is not a big threat in AB (Alec).

Meadow Foxtail Alopecurus pratensis

Small Alyssum Alyssum alyssoides

Desert alyssum Alyssum desertorum

Yellow alyssum Alyssum murale

Powell's Amaranth Amaranthus powellii

Red-root Pigweed Amaranthus retroflexus

  • Annual weed of disturbed/cultivated land, very widespread in AB. Not worth listing? (Alec.)

Common Ragweed Ambrosia artemisiifolia


Perennial Ragweed Ambrosia psilostachya

Great Ragweed Ambrosia trifida

Amur Peppervine Ampelopsis brevipedunculata

Exotic, not listed by ANHIC. USDA shows in eastern US, nowhere in Canada. Not listed by Darbyshire.

Fiddle-neck Amsinckia menziesii