[Milkvetches: The Genus Astragalus East of the Cascade Mountains of Oregon and Washington]

Canada Milk-vetch, Canadian Milkvetch, Short Canadian Milkvetch

Astragalus canadensis var. brevidens

Synonym: Astragalus brevidens

Close-up of the inflorescence of Canada Milk-vetch, Canadian Milk-vetch, Short Canadian Milkvetch: Astragalus canadensis var. brevidens (Synonym: Astragalus brevidens)

The photo above shows a close-up of the inflorescence of short canadian milk-vetch. Note the whitish-yellow corollas and assymetrical calyx tube with shorter, unequal calyx lobes than var. mortonii. Photographed along the highway to Chewelah Peak in the Colville N.F........June 23, 2006.

Characteristics:

Canada milk-vetch is a robust perennial wildflower with ascending to erect stems from 15-100 cm high arising singly or several together from spreading rhizomes. The leaves and stems are covered with short, fine, appressed hairs or may be green and glabrous. The pinnately compound leaves are 5-35 cm long with 13-35 leaflets measuring 10-45 mm long and broadly lanceolate, oblong, ovate or elliptic in outline.

The erect flower stems are 4-22 cm long. The densely flowered racemes elongate to 2.5-16 cm long and 2.5-3.5 cm wide when mature and bear up to 150 flowers. The calyx is bell-shaped but assymetrical at its base (See photo above.) and measures 4.5-8.5 mm long with awl-shaped to triangular teeth from 1-4 mm long. It is covered with whitish to black hairs that are appressed to the calyx tube or spreading. The petals are greenish-white or whitish-yellow or may be purple-tinged. The moderately recurved banner is 12-17.5 mm long while the wings are 10-15 mm long and the obtuse keel is 10-13.5 mm long. The erect, sessile pod is oblong-cylindric or ellipsoid in shape with an abruptly rounded base. The pods measure 8-20 mm long and 3-5 mm wide and are covered with minute, appressed hairs or are glabrous.

Upper leaf surface of Canada Milk-vetch, Canadian Milk-vetch, Short Canadian Milkvetch: Astragalus canadensis var. brevidens (Synonym: Astragalus brevidens)

The photo above shows a close-up of the pinnately compound leaf of short canadian milk-vetch with its ovate-lanceolate leaflets. Photographed along the highway up to Chewelah Peak in the Colville N.F.........June 23, 2006.

Habitat:

Canada milk-vetch may be found in vernally to permanently moist places along streams, in prairie or in woodland.


Range:

Canada milk-vetch may be found from northern British Columbia south to central California, central Nevada and southwestern Utah. It is found eastward to James Bay, Ontario and New England and south to South Carolina. It is found south through the Rocky Mts. to north-central New Mexico and eastward to southeastern Texas.


Close-up sideview of a flower of Canada Milk-vetch, Canadian Milk-vetch, Short Canadian Milkvetch: Astragalus canadensis var. brevidens (Synonym: Astragalus brevidens)

The photo above shows a close-up of a flower of short canadian milk-vetch as seen on the highway to Chewelah Peak in the Colville N.F.........June 23, 2006. Note the whitish-yellow corollas and assymetrical calyx tube covered with mostly white hairs and with shorter, unequal calyx lobes than var. mortonii.

Close-up of the inflorescence of Canada Milk-vetch, Canadian Milk-vetch, Short Canadian Milkvetch: Astragalus canadensis var. brevidens (Synonym: Astragalus brevidens)

The photo above shows the inflorescence of short canadian milkvetch atop its long, stout flower stem. Photographed near Chewelah Peak in the Colville N.F........June 23, 2006.

Inflorescence of Canada Milk-vetch, Canadian Milk-vetch, Short Canadian Milkvetch: Astragalus canadensis var. brevidens (Synonym: Astragalus brevidens) - Canada Milk-vetch, Canadian Milk-vetch, Short Canadian Milkvetch: Astragalus canadensis var. brevidens (Synonym: Astragalus brevidens) - Fruits of Canada Milk-vetch, Canadian Milk-vetch, Short Canadian Milkvetch: Astragalus canadensis var. brevidens (Synonym: Astragalus brevidens)

Examples of short canadian milkvetch as seen in a 2016 wildfire burn area about one mile north of Renner Lake along FS Road 95-705, Colville National Forest.........June 25, 2016.

Paul Slichter