Euclidium syriacum |
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Syrian mustard |
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Habit | Herbs annual, scabrous pubescent throughout. |
Stems | (4)10–40(45) cm, rigidly branched. |
Basal leaves | not rosulate; margins entire, dentate, or pinnatifid, petiolate. |
Cauline leaves | oblong, lanceolate, or elliptic; (1)1.5–7(9) × (0.3)0.7–2(3) cm, bases not auriculate; margins entire, dentate; petioles (0.2)0.5–2(2.5) cm; to sessile or subsessile distally. |
Inflorescences | bracts 0, fruiting pedicels appressed to rachis; stout, 0.5–1(1.2) mm, nearly half as wide as fruit. |
Flowers | sepals erect, caducous; ovate to oblong, 0.6–0.9 mm; lateral pair not saccate; petals narrowly spatulate, 0.9–1.3 × 0.1–0.2 mm, slightly > sepals, white; claws slightly differentiated from blades, 0.4–0.6 mm, nectar glands 4, 1 on each side of lateral stamens; stamens 6, slightly tetradynamous; anthers ovate; tips pointed; ovules 2 per ovary; septa complete, thickened; styles persistent, subconical; beak-like, curved; stout, 1–1.8 mm, sparsely pubescent; stigmas capitate, 2-lobed; lobes not decurrent. |
Fruits | nutlet-like silicles, 2-seeded, indehiscent; erect, appressed to rachis; ovoid, subterete to slightly 4-angled, 2–2.5 × 1.5–2 mm, scabrous, unsegmented; valves woody; veinless; replums strongly expanded laterally. |
Seeds | aseriate, oblong, 1.3–1.7 × 0.8–1.2 mm, brown, not mucilaginous when wetted; wingless; cotyledons accumbent. |
Trichomes | minutely stalked, 2-forked, mixed with fewer simple and rarely 3-forked. |
2n | =14. |
Euclidium syriacum |
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Distribution | |
Discussion | Waste places, roadsides. Flowering May–Jun. 300–1000 m. BW, Col, Owy. CA, ID, NV, WA; northeast to MT, east to NE, southeast to CO, MA; Asia, Europe. Exotic. |
Source | Flora of Oregon, volume 2, page 486 Ihsan Al-Shehbaz |
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