E-Flora BC: Electronic Atlas of the Flora of British Columbia

Artemisia tridentata subsp. wyomingensis Nutt.
Asteraceae (Aster family)

Introduction to Vascular Plants

© Amelie Rousseau  Email the photographer   (Photo ID #6054)

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Distribution of Artemisia tridentata subsp. wyomingensis
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Species Information

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General:
Perennial, aromatic, evergreen shrub; stems solitary or branched from the base with shredding, grey or light brown bark when older, or with a dense, grooved, white-woolly hairiness when young, 0.1-2.0 m tall.
Leaves:
Principal leaves unstalked or short-stalked, silvery-hairy, typically wedge-shaped with 3 blunt teeth at the tips or sometimes 4-9 toothed or shallowly lobed, 1-4 (rarely 6) cm long, 2-13 mm wide.
Flowers:
Heads discoid, numerous in a narrow to broad inflorescence; involucres narrowly bell-shaped, 3.0-3.8 mm tall; involucral bracts elliptic to obtuse, greyish-hairy; receptacles glabrous; female flowers absent; disk flowers 3-6, sometimes up to 12 at higher elevations.
Fruits:
Achenes resinous-granular, rarely short-hairy.
Notes:
Recently, the var. wyominensis Beetle & A. Young has been reported in BC. At the present time, however, our material has not been studied with respect to this variety thus only our two traditional varieties are recognized here. They may be distinguished as follows:

1. Involucres narrowly bell-shaped, about 4 mm tall and 2 mm wide; plants of arid sites in the steppe and lower montane zones ..... var. tridentata

1. Involucres broader, about 5 mm tall and 4 mm wide; plants of cooler, mesic open sites in the upper montane and subalpine zones ..... var. vaseyana (Rydb.) Boivin

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Yellow
Blooming Period:
Late Summer
Fruit/Seed characteristics:
Colour: Brown
Present over the Fall
Source:  The USDA

Habitat / Range

Dry to mesic meadows and slopes in the steppe to subalpine zones; common in SC BC, rare in SE BC; E to AB and S to ND, NM, AZ, and CA.

Source: The Illustrated Flora of British Columbia

Taxonomic and Nomenclatural Links

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General References