Achillea millefolium

Yarrow

Achillea millefolium L. var. millefolium

Synonyms

Achillea pannonica Scheele

Achillea rosea Desfontaines

ANPC Rank –
Moss, Flora of Alberta – Possibly present
Global Invasive Species Database – No
NatureServe Rank – Yes, not yet assessed
Haber, Upland – No
Haber, Wetland – No
CWF, Status & Invasive Range – No
Alberta Revegetation Guidelines – No
The Nature Conservancy – No
CBCN – No
AB Weed – No

Remarks

Taxonomy is not clear and it's not easy to separate native from introduced populations. Still, it is often seen along trails, but not away from them in similar habitat, and does tend to increase with disturbance, both of which suggest expanding range.

[[1]]Link to Flora of North America, Achillea millefolium Linnaeus, Sp. Pl. 2: 899. 1753. - "...Achillea millefolium is morphologically variable and has been treated as either a single species with varieties or as multiple distinct species. At least 58 names have been used for North American specimens..."

The USDA Plants database lists 12 subtaxa of A. millefolium that can be found in North America, but only Achillea millefolium var. millefolium is believed to be introduced.

[2]Link to USDA Plants profile for Achillea millefolium L. common yarrow

[3]Link to USDA Plants profile for Achillea millefolium L. var. millefolium

Difficult to distinguish from the native var. lanulosa (The pictures here may be either or both).