Page author: David Giblin
Sisymbrium altissimum
Jim Hill mustard, tumble mustard, tall rocket
WTU specimens
Other herbaria

Distribution: Distributed throughout Washington but more common east of the Cascades; occurring throughout North America.

Habitat: Shrub-steppe, grasslands, and waste ground, especially following rangeland fires.

Flowers: May-September

Origin: Introduced from Eurasia

Conservation Status: Not of concern

Description:
General:

Annual herb, the erect, freely-branching stems 3-15 dm. tall, glabrous above and with a few stiff hairs below.

Leaves:

Leaves alternate, broadly lanceolate or oblong to oblanceolate, up to 1.5 dm. long, petiolate, the lower ones pinnatifid, the segments often pointing backward, becoming pinnatifid with linear segments above.

Flowers:

Inflorescence of bractless racemes; pedicles stout, spreading, 4-10 mm. long; sepals 4, somewhat spreading, 4 mm. long; petals 4, pale yellowish, clawed, 6-8 mm. long; stamens 6; style lacking, stigma 2-lobed.

Fruits:

Siliques linear, terete, 5-10 cm. long, slightly broader than the pedicles, spreading and rigid; valves with a prominent mid-nerve and 2 evident lateral nerves; seeds in 1 series.

Accepted Name:
Sisymbrium altissimum L.
Publication: Sp. Pl. 2: 659. 1753. 1753.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Sisymbrium altissimum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Sisymbrium altissimum checklist entry.

E-Flora BC: Sisymbrium altissimum atlas page.

CalPhotos: Sisymbrium altissimum photos.

USDA Plants: Sisymbrium altissimum information.

32 photographs:
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