Erysimum franciscanum |
Erysimum cheiranthoides |
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treacle mustard, wormseed mustard |
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Habit | Plants annual. | |
Stems | (0.7)1.5–10(15) dm, ribbed. |
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Basal leaves | withered by fruiting. |
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Cauline leaves | middle and upper lanceolate, linear, or elliptic-oblong; (1)2–7(11) × (0.2)0.5–1.2(2.3) cm; margins subentire, denticulate, or rarely sinuate-dentate; short-petiolate or sessile. |
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Inflorescences | fruiting pedicels divaricate or ascending, 5–13(16) mm; much narrower than fruits. |
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Flowers | sepals oblong, 1.8–3.2 mm; lateral pair not saccate; petals spatulate, 3–5.5 × 1.5–2 mm, yellow; claws 1.5–3.5 mm; petal tips rounded; median filaments 2–3.5 mm; ovules (20)30–55 per ovary; styles slender, 0.5–1.5 mm; stigmas entire or slightly 2-lobed. |
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Fruits | 4-angled; somewhat torulose; (1)1.5–2.5(4) cm × 1–1.3 mm; valves with distinct midveins, pubescent outside with 3–5-rayed trichomes, densely pubescent inside. |
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Seeds | oblong, 1–1.5 × 0.4–0.6 mm; wings absent. |
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Trichomes | 3–4(5)-rayed. |
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2n | =16. |
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Erysimum franciscanum |
Erysimum cheiranthoides |
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Distribution | ||
Discussion | Pastures, fields, waste grounds, disturbed areas, dry creek beds. Flowering Apr–Aug. 50–1400 m. BR, BW, Col, Lava, WV. CA, ID, NV, WA; throughout Canada and US; Asia, Europe. Exotic. |
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Source | Flora of Oregon, volume 2, page 485 Ihsan Al-Shehbaz |
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Sibling taxa | ||
Web links |
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