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Loesel's tumblemustard, small tumbleweed mustard, tall hedge mustard

Habit Plants annual, densely hispid below with retrorse trichomes, usually glabrous above.
Stems

(2)3.5–12(17.5) dm.

Basal leaves

rosulate;

blades broadly oblanceolate; (1.5)2.5–8(12) × (1)2–5(7) cm, runcinate to lyrate-pinnatifid;

lateral lobes 2–4 per side;

margins entire or dentate;

petioles 1–4(5) cm.

Cauline leaves

similar to basal; uppermost leaves much smaller;

margins entire or toothed.

Inflorescences

bracts 0, fruiting pedicels divaricate or ascending, 5–12(15) mm; narrower than fruits.

Flowers

sepals ascending, 3–4 mm;

petals spatulate, 6–8 × 2–3 mm;

claws 2.5–3.5 mm;

ovules 40–60 per ovary;

styles stout, 0.3–0.7 mm;

stigmas prominently 2-lobed.

Fruits

not appressed to rachis, narrowly linear, subtorulose; terete, curved or straight, 2–3.5(5) cm × 0.9–1.1 mm; young fruits not overtopping flowers;

valves often glabrous.

Seeds

0.7–1 × 0.5–0.6 mm.

2n

=14.

Sisymbrium loeselii

Distribution
[WildflowerSearch map]
[BONAP county map]
Discussion

Roadsides, disturbed areas, prairies, riverbanks, pastures. Flowering May–Sep. 600–1200 m. BW. CA, ID, NV, WA; scattered in southern Canada and northern US; Asia, Europe. Exotic.

Source Flora of Oregon, volume 2, page 509
Ihsan Al-Shehbaz
Sibling taxa
S. altissimum, S. irio, S. linifolium, S. officinale, S. orientale
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