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FNA | Family List | FNA Vol. 7 | Brassicaceae

7. Athysanus Greene, Bull. Calif. Acad. Sci. 1: 72. 1885.

[Greek a-, without, and thysanos, fringe, alluding to fruit margin] [Greek a-, without, and thysanos, fringe, alluding to fruit margin]

Ihsan A. Al-Shehbaz

Heterodraba Greene

Annuals; not scapose; glabrous or pubescent, trichomes simple mixed with short-stalked, forked, 3-rayed, or cruciform ones. Stems (few from base), ascending, branched. Leaves basal and cauline; petiolate or sessile; basal not rosulate, shortly petiolate, blade margins entire or dentate; cauline shortly petiolate or sessile, blade (base not auriculate), margins entire or dentate. Racemes (corymbose, several-flowered, secund, lax), considerably elongated in fruit. Fruiting pedicels recurved or reflexed, slender or stout, (glabrous or pubescent). Flowers (cleistogamous and/or chasmogamous); sepals suberect, oblong, lateral pair not saccate basally, (glabrous or pubescent); petals white, (usually rudimentary, or well-developed and exceeding sepals, rarely absent), spatulate or oblong, claw indistinct; stamens subequal; filaments slightly dilated or not basally; anthers ovate to globose; nectar glands lateral, each side of lateral stamens. Fruits (pendulous), silicles, indehiscent or very tardily dehiscent, sessile, usually orbicular or obovate to elliptic, rarely oblong, twisted or flattened, latiseptate; valves each not veined or veins prominent, pubescent or glabrous; replum rounded; septum absent or complete; ovules 2-12 per ovary; style obsolete or distinct; stigma capitate. Seeds uniseriate, flattened, not winged, oblong; seed coat not mucilaginous when wetted; cotyledons accumbent.

Species 2 (2 in the flora): w North America, nw Mexico.


1 Fruits 1-locular, not twisted; valves usually pubescent, rarely glabrous, some or all trichomes hooked; seeds 1.   1 Athysanus pusillus
+ Fruits 2-locular, flat or slightly twisted; valves glabrous or pubescent, trichomes not hooked; seeds often 2+.   2 Athysanus unilateralis

Lower Taxa


 

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