Sisymbrium officinale |
Sisymbrium irio |
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hedge mustard |
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Habit | Annual herb, the stem simple or loosely-branched, 3-8 dm. tall, strongly pubescent with spreading, stiff, pungent hairs. | |
Leaves | Basal leaves lyrate-pinnatifid, petiolate, up to 2 dm. long, the terminal lobe ovate, with shallow, rounded lobes; cauline leaves alternate, sessile, much reduced, pinnatifid with 4-6 linear to narrowly-lanceolate lobes, the terminal lobe deltoid-lanceolate. |
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Flowers | Inflorescence of bractless racemes, often elongate to 3.5 dm. in fruit; pedicles erect, stout, 2-3 mm. long, enlarged at the tip to the thickness of the silique; sepals 4, oblong-oblanceolate, 2 mm. long; petals 4, pale yellow, 3-4 mm. long; stamens 6; style lacking, stigma 2-lobed. |
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Fruits | Siliques erect, tightly appressed, 8-15 mm. long, terete, linear but tapering to a beak-like tip; valves 3-nerved; seeds in 1 series. |
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Sisymbrium officinale |
Sisymbrium irio |
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Flowering time | March-September | |
Habitat | Waste ground and other disturbed areas at low elevations. | |
Distribution | Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
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Origin | Introduced from Europe | |
Conservation status | Not of concern | |
Sibling taxa | ||
Web links |
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