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FNA | Family List | FNA Vol. 7 | Brassicaceae | Erysimum

4. Erysimum capitatum (Douglas ex Hooker) Greene, Fl. Francisc. 269. 1891.

Cheiranthus capitatus Douglas ex Hooker, Fl. Bor.-Amer. 1: 38. 1829, based on C. asper Chamisso & Schlechtendal, Linnaea 1: 14. 1826, not Nuttall 1818

Biennials or perennials; (short-lived). Trichomes of leaves 2-4(-7)-rayed. Stems erect, often branched distally, sometimes proximally, (0.5-)1.2-10(-12) dm. Basal leaves (often withered by flowering); blade spatulate to narrowly oblanceolate or linear, 2-18(-27) cm × 3-15(-30) mm, base attenuate, margins entire or dentate to denticulate, apex acute. Cauline leaves (distal) sessile; blade margins entire or denticulate. Racemes considerably elongated in fruit. Fruiting pedicels divaricate to ascending, stout or slender, narrower than fruit, 4-17(-25) mm. Flowers: sepals narrowly oblong, 7-14 mm, lateral pair saccate basally; petals usually orange to yellow, rarely lavender or purplish, suborbicular to obovate, 12-25 (-30) × (5-)6-10(-13) mm, claw 8-16 mm, apex rounded; median filaments 9-18 mm; anthers linear, 3-4 mm. Fruits divaricate or ascending to erect, narrowly linear, straight or curved upward, not torulose, 3.5-11(-15) cm × 1.3-3.3 mm, 4-angled to latiseptate, not striped; valves with prominent midvein, pubescent outside, trichomes 2-5-rayed, glabrous inside; ovules (40-)54-82 per ovary; style cylindrical, usually stout, rarely slender, 0.2-2.5(-3) mm, sparsely pubescent; stigma 2-lobed, lobes as long as wide. Seeds oblong, 1.5-4 × 1-2 mm; winged apically or not winged. 2n = 36.

Varieties 2 (2 in the flora): North America, n Mexico.

1 Seeds winged (at least distally, rarely wing rudimentary), 2-4 × (0.8-)1-2 mm; fruits latiseptate, rarely 4-angled; petals usually orange, sometimes orange-yellow or yellow; adaxial surfaces of basal and proximalmost cauline leaf blades with mostly 3(-7)-rayed trichomes.   4a Erysimum capitatum var. capitatum
+ Seeds not winged, 1.5-2(-2.4) × 0.7-1.2 mm; fruits 4-angled, rarely latiseptate; petals yellow, rarely lavender or purplish; adaxial surfaces of basal and proximalmost cauline leaf blades with mostly 2- or 3-rayed trichomes.   4b Erysimum capitatum var. purshii

Lower Taxa


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