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FNA | Family List | FNA Vol. 7 | Brassicaceae

12. Cusickiella Rollins, J. Jap. Bot. 63: 68. 1988.

[For William C. Cusick, 1842-1922, Oregon plant collector] [For William C. Cusick, 1842-1922, Oregon plant collector]

Ihsan A. Al-Shehbaz

Perennials; (cespitose or pulvinate, taprooted, caudex much-branched, woody, with persistent leaf remains); scapose or subscapose; glabrous or pubescent, trichomes simple, often mixed with stalked, forked, or subdendritic ones. Stems erect, unbranched. Leaves basal and sometimes cauline; sessile; basal (terminating caudex branches, thickened at base, persistent, erect), rosulate, blade margins entire; cauline (absent or few as bracts), blade (base not auriculate), margins entire. Racemes (corymbose, proximal flowers sometimes bracteate), elongated in fruit. Fruiting pedicels divaricate or ascending, slender. Flowers: sepals (erect to ascending), oblong; petals white or yellowish, spatulate or oblanceolate, (slightly longer than sepals, base attenuate to short claw); stamens slightly tetradynamous; filaments dilated basally; anthers ovate; nectar glands: lateral annular, median glands confluent with lateral. Fruits sessile or minutely stipitate, ovoid or ellipsoid, not torulose, terete or 4-angled, (thick and leathery); valves each with prominent or obscure midvein, (sometimes keeled), puberulent or glabrous; replum rounded; septum complete; ovules 4 per ovary; stigma capitate. Seeds aseriate, plump, not winged, ovoid to oblong; seed coat (smooth), not mucilaginous when wetted; cotyledons incumbent or obliquely so.

Species 2 (2 in the flora): w United States.


1 Racemes ebracteate; fruit valves rounded on back, each with obscure midvein; leaf blades (0.3-)0.5-1.2(-1.4) cm, trichomes on surfaces not setiform; petals white.   1 Cusickiella douglasii
+ Racemes bracteate basally; fruit valves keeled on back, each with prominent midvein; leaf blades 0.2-0.5 cm, trichomes on surfaces setiform; petals pale yellow.   2 Cusickiella quadricostata

Lower Taxa


 

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