Sisymbrium officinale |
Sisymbrium linifolium |
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hedge mustard |
flax-leaved plains mustard, lava cress |
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Habit | Plants annual, hirsute with retrorse trichomes, rarely subglabrous above. | Plants perennial, glabrous or rarely sparsely pubescent basally; rhizomatous. |
Stems | 2.5–7.5(11) dm. |
(1.5)3–7(11) 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. |
not rosulate. 1.5–6 cm; margins entire; pinnatifid or pinnatisect; lateral lobes oblong to linear, 0.5–2.5 cm × 0.3–1(2) mm. |
Cauline leaves | similar to basal; uppermost leaves smaller, lobed, dentate, or subentire. |
lowermost similar to basal; middle leaves linear, filiform, or oblanceolate; margins entire, dentate, or pinnately lobed; (1)2.5–9(12) cm × 1–3.5(5) mm; uppermost leaves filiform to linear; margins entire, sessile or short-petiolate. |
Inflorescences | bracts 0, fruiting pedicels erect, appressed to rachis; stout, 1.5–3(4) mm; narrower than fruits. |
bracts 0, fruiting pedicels divaricate to ascending; (3)5–9(11) 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 (3)4–7 mm, ascending; petals spatulate; (6)8–12 × (1.5)2–4 mm; claws 2–5 mm; ovules 60–94 per ovary; styles 0.5–1 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, not torulose; terete; (2.5)3.5–6.5 cm × 0.9–1.2 mm. |
Seeds | oblong, 1–1.3 × 0.5–0.6 mm. |
1–2 × 0.4–0.6 mm. |
2n | =14. |
=14. |
Sisymbrium officinale |
Sisymbrium linifolium |
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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. |
Rocky or gravelly hillsides, shady rock cliffs, pinyon-juniper areas, sagebrush communities, abandoned fields, sandy prairies. Flowering Apr–Jun. 500–1600 m. BR, BW, Col, Lava, Owy. ID, NV, WA; north to British Columbia, northeast to MT, east to WY, southeast to NM. Native. |
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 | Schoenocrambe linifolia |
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