Sisymbrium loeselii |
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Loesel's tumblemustard, small tumbleweed mustard, tall hedge mustard |
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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 |
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Distribution | |
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 | |
Web links |
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