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

Athysanus pusillus (Hook.) Greene
common sandweed
Brassicaceae (Mustard family)

Introduction to Vascular Plants

© Curtis Bjork  Email the photographer   (Photo ID #15897)

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Distribution of Athysanus pusillus
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Species Information

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Annual herb from a slender taproot; stems usually branched from leafy base, 4-35 cm tall, short-hairy with simple and 2-to 5-branched hairs.
Basal leaves oblanceolate to egg-shaped, entire or obscurely toothed, 6-30 mm long, 2-10 mm wide, short-stalked, with coarse, cross-shaped hairs; stem leaves mostly unstalked, reduced upward.
Inflorescence of 1-several long, narrow, 1-sided clusters with well-spaced, inconspicuous flowers; petals white, 1-2 mm long, spoon-shaped, sometimes lacking; sepals about 1 mm long, dropping early.
Silicles, 2.0-2.5 mm wide, round, flattened parallel to the partition, often with 2 types of hairs, the larger hairs flat and hooked, the smaller hairs branched or lacking; styles 0.2-0.3 mm; stalks bent downward, 1-4 mm long; seeds 1, flat.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry (sometimes vernally moist) grassy slopes and rock outcrops in the lowland and steppe zones; infrequent in S BC; S to ID and CA.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Athysanus pusillus var. glabrior S. Watson
Thysanocarpus pusillus Hook.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References