Sisymbrium officinale |
Sisymbrium loeselii |
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hedge mustard |
Loesel's tumblemustard, small tumbleweed mustard, tall hedge mustard |
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Habit | Plants annual, hirsute with retrorse trichomes, rarely subglabrous above. | Plants annual, densely hispid below with retrorse trichomes, usually glabrous above. |
Stems | 2.5–7.5(11) dm. |
(2)3.5–12(17.5) dm. |
Basal leaves | usually rosulate; blades (2)3–10(15) × (1)2–5(8) cm, lyrate-pinnatifid; pinnatisect, or runcinate; lateral lobes 2–4(5) per side; margins entire, dentate, or lobed; petioles (1)2–7(10) cm. |
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 smaller, lobed, dentate, or subentire. |
similar to basal; uppermost leaves much smaller; margins entire or toothed. |
Inflorescences | bracts 0, fruiting pedicels erect, appressed to rachis; stout, 1.5–3(4) mm; narrower than fruits. |
bracts 0, fruiting pedicels divaricate or ascending, 5–12(15) mm; narrower than fruits. |
Flowers | sepals erect, 2–2.5 mm; petals spatulate, 2.5–4 × 1–2 mm; claws 1–2 mm; ovules 10–20 per ovary; styles (0.8)1–1.5(2) mm; stigmas slightly 2-lobed. |
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 | appressed to rachis, slightly torulose or not; terete; stout; straight subulate-linear; (0.7)1–1.4(1.8) cm × 1–1.5 mm; valves glabrous or pubescent. |
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 | oblong, 1–1.3 × 0.5–0.6 mm. |
0.7–1 × 0.5–0.6 mm. |
2n | =14. |
=14. |
Sisymbrium officinale |
Sisymbrium loeselii |
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Distribution | ||
Discussion | Fields, roadsides, pastures, disturbed areas, deserts. Flowering Mar–Aug. 0–1900 m. Casc, CR, Est, Sisk, WV. CA, ID, NV, WA; scattered throughout North America; Africa, Asia, Europe. Exotic. |
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 510 Ihsan Al-Shehbaz |
Flora of Oregon, volume 2, page 509 Ihsan Al-Shehbaz |
Sibling taxa | ||
Synonyms | Sisymbrium officinale var. leiocarpum, Sisymbrium officinale var. officinale | |
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