Burke: Sisymbrium loeselii

	Sisymbrium loeselii
	false london rocket, Loesel's tumblemustard
Habit	Annual herb, the erect, freely-branching stems 4-12 dm. tall, glabrous above and with a few stiff, spreading hairs below.
Leaves	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.
Flowers	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.
Fruits	Siliques linear, terete, 2-3.5 cm. long, ascending to erect; valves prominently 3-nerved; seeds in 1 series.

	Sisymbrium loeselii
Flowering time	June-August
Habitat	Roadsides and drier disturbed areas.
Distribution	Occurring chiefly east of the Cascades crest in Washington; British Columbia to Nevada, east to the Atlantic Coast. [WildflowerSearch map] [BONAP county map]
Origin	Introduced from Eurasia
Conservation status	Not of concern
Sibling taxa	S. altissimum, S. linifolium, S. officinale, S. orientale
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Sisymbrium loeselii

false london rocket, Loesel's tumblemustard

Habit

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

Leaves

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.

Flowers

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.

Fruits

Siliques linear, terete, 2-3.5 cm. long, ascending to erect;

valves prominently 3-nerved;

seeds in 1 series.