Erysimum occidentale |
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pale wallflower, western wallflower |
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Habit | Biennials. |
Stems | erect, often branched distally, 0.5–3(–6.5) dm. |
Basal leaves | (often withered by fruiting); blade linear-oblanceolate, 2–11(–15) cm × (1.5–)2–6 mm, margins usually entire, rarely denticulate. |
Cauline leaves | (distal) sessile; blade margins entire. |
Racemes | (simple or branched), considerably elongated in fruit. |
Flowers | sepals linear-oblong, 8–13 mm, lateral pair saccate basally; petals bright or pale yellow, obovate to broadly so, 14–22(–25) × 3–7.5 mm, claw 11–16 mm, apex rounded; median filaments 10–14 mm; anthers linear, 3–4 mm. |
Fruiting pedicels | divaricate-ascending, slender, narrower than fruit, 4–11(–15) mm. |
Fruits | ascending, narrowly linear, straight, not torulose, 3–12 cm × (2–)2.4–3.7 mm, strongly latiseptate, not striped; valves with prominent midvein, pubescent outside, trichomes 2- and 3-rayed, glabrous inside; ovules 34–46 per ovary; style cylindrical, slender, (2–)2.5–5 mm, sparsely pubescent; stigma entire. |
Seeds | ovoid, (2–)2.5–3.5 × 1.3–2.5 mm; wing continuous distally, (0.3–0.8 mm wide). |
Trichomes | of leaves 2- or 3-rayed. |
2n | = 36. |
Erysimum occidentale |
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Phenology | Flowering Apr–Jun. |
Habitat | Sand deposits |
Elevation | 50-700 m (200-2300 ft) |
Distribution |
OR; WA
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Discussion | Erysimum occidentale is restricted to sand deposits along or near the Columbia River and its tributaries. It is distributed in Gilliam, Hood River, Morrow, Sherman, and Umatilla counties in Oregon, and in Franklin, Grant, Kittitas, Klickitat, Lincoln, Walla Walla, and Yakima counties in Washington. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 543. |
Parent taxa | Brassicaceae > tribe Erysimeae > Erysimum |
Sibling taxa | |
Synonyms | Cheiranthus occidentalis, Cheirinia occidentalis |
Name authority | (S. Watson) B. L. Robinson: in A. Gray et al., Syn. Fl. N. Amer. 1(1,1): 144. (1895) |
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