Sisymbrium officinale |
Sisymbrium irio |
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hedge mustard |
London rocket |
|
Habit | Plants annual, hirsute with retrorse trichomes, rarely subglabrous above. | Plants annual, glabrous or sparsely pubescent at least below. |
Stems | 2.5–7.5(11) dm. |
(1)2–6(7.5) 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 oblanceolate or oblong in outline; (1.5)3–12(15) × (0.5)1–6(9) cm, runcinate to pinnatisect; lateral lobes (1)2–6(8) per side; < terminal lobe; margins entire, dentate, or lobed; petioles (0.5)1–4.5(6) cm. |
Cauline leaves | similar to basal; uppermost leaves smaller, lobed, dentate, or subentire. |
lower similar to basal; uppermost smaller. |
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)7–12(20) 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 erect, 2–2.5 mm; petals oblong-oblanceolate, 2.5–3.5(4) × 1–1.5 mm; claws 1–1.5 mm; ovules 40–90 per ovary; styles 0.2–0.5 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, slightly torulose; terete; (2.5)3–4(5) cm × 0.9–1.1 mm; young fruits overtopping flowers; valves glabrous. |
Seeds | oblong, 1–1.3 × 0.5–0.6 mm. |
0.8–1 × 0.5–0.6 mm. |
2n | =14. |
=14. |
Sisymbrium officinale |
Sisymbrium irio |
|
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. |
Pastures, disturbed areas, rocky slopes, fields, orchards, prairies. Flowering Jan–May. 0–50 m. WV. CA, NV; scattered in North America; scattered nearly worldwide. 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 | |
Web links |
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