Page authors: Don Knoke, David Giblin
Sisymbrium loeselii
false London rocket, Loesel's tumblemustard

Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to Nevada, east to the Atlantic Coast.

Habitat: Roadsides and drier disturbed areas.

Flowers: June-August

Origin: Introduced from Eurasia

Growth Duration: Annual, Biennial

Conservation Status: Not of concern

Pollination: Bees, flies, butterflies


Annual herb, the erect, freely-branching stems 4-12 dm. tall, glabrous above and with a few stiff, spreading hairs below.


Leaves alternate, broadly deltoid-lanceolate to lanceolate, short-petiolate, the lower ones up to 15 cm. long, pinnatifid with backward-pointing segments, the terminal lobe large, irregularly serrate, acuminate.


Inflorescence of bractless racemes up to 4 dm. long; pedicles slender, 7-20 mm. long, slightly ascending; sepals 4, lanceolate, 3.5 mm. long, somewhat spreading; petals 4, lemon yellow, clawed, 6-8 mm. long; stamens 6; style lacking, stigma 2-lobed.


Siliques linear, terete, 2-3.5 cm. long, ascending to erect; valves prominently 3-nerved; seeds in 1 series.

Accepted Name:
Sisymbrium loeselii L.
Publication: Cent. Pl. I. 18. 1755.

Synonyms & Misapplications:
(none provided)
Additional Resources:

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

WA Flora Checklist: Sisymbrium loeselii checklist entry.

OregonFlora: Sisymbrium loeselii information.

E-Flora BC: Sisymbrium loeselii atlas page.

CalPhotos: Sisymbrium loeselii photos.

USDA Plants: Sisymbrium loeselii information.

27 photographs:
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