Erysimum asperum

(Nuttall) de Candolle
Syst. Nat. 2: 505. 1821.
WeedyIllustratedEndemic
Basionym: Cheiranthus asper Nuttall Gen. N. Amer. Pl. 2: 69. 1818
Synonyms: Cheirinia aspera (Nuttall) Rydberg Erysimum asperum var. dolichocarpum O. E. Schulz
Treatment appears in FNA Volume 7. Treatment on page 537. Mentioned on page 535.

Biennials. Trichomes of leaves 2- or 3-rayed. Stems erect, unbranched or branched distally, (0.6–)1.2–6.5(–8) dm. Basal leaves (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 (distal) sessile; blade margins entire or denticulate. Racemes considerably elongated in fruit. Fruiting pedicels horizontal to divaricate, slender, narrower than fruit, 5–16(–25) mm. Flowers: 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. Fruits 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 ovoid, (1–)1.3–2.3 × 0.7–1.2 mm; usually not winged, rarely winged distally. 2n = 36.


Phenology: Flowering Apr–Jun(-Aug).
Habitat: Prairies, sand dunes, roadsides, bluffs, sandhills along stream banks, knolls, open plains
Elevation: 200-2000 m

Distribution

V7 848-distribution-map.gif

Alta., Man., Sask., Ark., Colo., Ill., Kans., Minn., Mont., Nebr., N.Mex., N.Dak., Okla., S.Dak., Tex., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.

... more about "Erysimum asperum"
Ihsan A. Al-Shehbaz +
(Nuttall) de Candolle +
Cheiranthus asper +
Alta. +, Man. +, Sask. +, Ark. +, Colo. +, Ill. +, Kans. +, Minn. +, Mont. +, Nebr. +, N.Mex. +, N.Dak. +, Okla. +, S.Dak. +, Tex. +  and Wyo. +
200-2000 m +
Prairies, sand dunes, roadsides, bluffs, sandhills along stream banks, knolls, open plains +
Flowering Apr–Jun(-Aug). +
Weedy +, Illustrated +  and Endemic +
Cheirinia aspera +  and Erysimum asperum var. dolichocarpum +
Erysimum asperum +
Erysimum +
species +