Page author: David Giblin
Salsola tragus
Russian thistle, tumbleweed
WTU specimens
Other herbaria

Distribution: Introduced from Eurasia world-wide in arid regions; chiefly east of the Caascades, southern British Columbia to California.

Habitat: Dry, open ground and wasteland.

Flowers: June - August

Origin: Introduced from Eurasia

Conservation Status: Not of concern

Description:
General:

Glabrous to pubescent annual, with numerous spreading-ascending, often purplish stems up to 1 m. long, becoming hardened and rounded, forming tumble-weeds.

Leaves:

Leaves alternate, linear, succulent, 1-3 cm. long, with a spiny tip, reduced upward but broadening at the base, becoming spiny bracts with scarious margins basally.

Flowers:

Flowers small, perfect, solitary or clustered in the axils of the bracts, each with a pair of bracteoles 2.5-3.5 mm. long; perianth 5-cleft nearly to the base, in fruit becoming winged, the wing veined; stamens 5, attached at the edge of a tiny, lobed disk; styles 2.

Fruits:

Fruit cup-shaped, 2.5 mm. broad, completely enclosed by the persistent calyx.

Accepted Name:
Salsola tragus L.
Publication: Cent. Pl. II. 13. 1756. 1756.

Synonyms & Misapplications:
Salsola australis R. Br.
Salsola iberica (Sennen & Pau) Botsch. ex Czerepanov
Salsola kali L., misapplied [FNA4, HC, HC2]
Salsola kali L. var. tenuifolia Tausch ex Moq. [VPPNW2]
Salsola pestifer A. Nelson
Additional Resources:

PNW Herbaria: Specimen records of Salsola tragus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Salsola tragus checklist entry.

E-Flora BC: Salsola tragus atlas page.

CalPhotos: Salsola tragus photos.

USDA Plants: Salsola tragus information.

28 photographs:
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