Erysimum cheiri |
Erysimum asperum |
|
---|---|---|
Aegean wallflower, common wallflower, European wallflower, wallflower |
plains wallflower, prairie rocket, sanddune wallflower, western wallflower |
|
Habit | Biennials or subshrubs. | Biennials. |
Stems | erect, unbranched or branched distally, (woody at base when subshrubs), 1.5–8 dm. |
erect, unbranched or branched distally, (0.6–)1.2–6.5(–8) dm. |
Basal leaves | (rosulate when biennial, often withered by fruiting), similar to cauline. |
(often withered by fruiting); blade oblanceolate, 2–10 cm × (0.2–)0.5–1.5(–2.4) mm, base attenuate, margins dentate, apex acute. |
Cauline leaves | petiolate; blade (obovate to oblanceolate, 4–22 cm × 3–12 mm, base cuneate to attenuate), margins entire to repand. |
(distal) sessile; blade margins entire or denticulate. |
Racemes | considerably elongated in fruit. |
considerably elongated in fruit. |
Flowers | sepals oblong, 6–10 mm, lateral pair not or slightly saccate basally; petals orange, yellow, brown, red, purple, violet, or white, broadly obovate to suborbicular, 20–35x 5–10 mm, claw 7–12 mm, apex rounded; median filaments 7–9 mm; anthers linear, 2.5–3.5 mm. |
sepals oblong to linear-oblong, 8–12 mm, lateral pair slightly saccate basally; petals yellow, obovate to suborbicular, 13–22 × 4–9 mm, claw 8–15 mm, apex rounded; median filaments 8–14 mm; anthers linear, 2.5–4 mm. |
Fruiting pedicels | divaricate-ascending to ascending, slender, narrower than fruit, 7–13 mm. |
horizontal to divaricate, slender, narrower than fruit, 5–16(–25) mm. |
Fruits | ascending, narrowly linear, straight, not torulose, 3–10 cm × 2–7 mm, latiseptate to terete, not striped; valves with prominent midvein, pubescent outside, trichomes 2-rayed, glabrous inside; ovules 32–44 per ovary; style cylindrical or subconical, slender, 0.5–4 mm, pubescent; stigma strongly 2-lobed, lobes much longer than wide. |
widely spreading or divaricate, narrowly linear, usually straight, rarely curved upward, not torulose, (3–)5–12(–14) cm × 1.2–2.7 mm, 4-angled, strongly (longitudinally) 4-striped; valves with prominent midvein and replum, densely pubescent outside, trichomes 2-rayed between midvein and replum, glabrous inside; ovules 72–120 per ovary; style cylindrical, slender, 1–4 mm, sparsely pubescent; stigma slightly 2-lobed, lobes as long as wide. |
Seeds | ovate, 2–4 × 1.5–3 mm; wing continuous or distal. |
ovoid, (1–)1.3–2.3 × 0.7–1.2 mm; usually not winged, rarely winged distally. |
Tri | -chomes of leaves 2-rayed, rarely mixed with fewer 3-rayed ones apically. |
|
Trichomes | of leaves 2- or 3-rayed. |
|
2n | = 12. |
= 36. |
Erysimum cheiri |
Erysimum asperum |
|
Phenology | Flowering Apr–Jul. | Flowering Apr–Jun(-Aug). |
Habitat | Disturbed sites, lawns, abandoned gardens | Prairies, sand dunes, roadsides, bluffs, sandhills along stream banks, knolls, open plains |
Elevation | 0-1500 m (0-4900 ft) | 200-2000 m (700-6600 ft) |
Distribution |
CA; BC; QC; YT; Europe [Introduced in North America]
|
AR; CO; IL; KS; MN; MT; ND; NE; NM; OK; SD; TX; WY; AB; MB; SK
|
Discussion | Erysimum cheiri is a widely cultivated ornamental of European origin. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 7, p. 539. | FNA vol. 7, p. 537. |
Parent taxa | Brassicaceae > tribe Erysimeae > Erysimum | Brassicaceae > tribe Erysimeae > Erysimum |
Sibling taxa | ||
Synonyms | Cheiranthus cheiri | Cheiranthus asper, Cheirinia aspera, E. asperum var. dolichocarpum |
Name authority | (Linnaeus) Crantz: Cl. Crucif. Emend., 116. (1769) | (Nuttall) de Candolle: Syst. Nat. 2: 505. (1821) |
Web links |
|