Cusickiella Rollins, J. Jap. Bot. 63: 68. 1988
Ihsan A. Al-Shehbaz
Tribe: Boechereae Al-Shehbaz, Beilstein & E. A. Kellogg, Pl. Syst. Evol. 259: 111. 2006.
Name derivation: for William C. Cusick, 1842–1922, plant collector mainly in Oregon.
Type species: Cusickiella douglasii (A. Gray) Rollins (based on Draba douglasii A. Gray).
Cusickia O. E. Schulz in Engler & Prantl, Nat. Pflanzenfam. Ed 2, 17B: 521. 1936, nom. illeg., non Cusickia M. E. Jones, Contr. W. Bot. 12. 39. 1908.
Herbs, perennial, taprooted, cespitose, pulvinate; caudex highly branched, woody. Trichomes simple, often mixed with stalked, forked or subdendritic ones. Multicellualr glands absent. Stems scapose, erect, leafless or few leaved. Basal leaves sessile and thickened at base, rosulate and terminating caudex branches, simple, entire, persistent; cauline leaves absent or few and as bracts, sessile, simple, entire. Racemes few to many flowered, ebracteate or lowermost flowers bracteates, corymbose; rachis straight; fruiting pedicels ascending to divaricate, persistent. Sepals oblong, free, caducous, erect to ascending, equal, base of lateral pair not saccate. Petals white or yellowish, erect at base, slightly longer than sepals; blade spatulate to oblanceolate, obtuse at apex; claw shorter than sepals, glabrous, unappendaged, entire. Stamens 6, somewhat included, slightly tetradynamous; filaments wingless, unappendaged, glabrous, free; anthers ovate, not apiculate. Nectar glands confluent, lateral annular, median present. Ovules 4 per ovary. Fruits dehiscent silicles, ovoid to ellipsoid, terete or 4-angled, not inflated, unsegmented; valves thick, leathery, with a prominent or obscure midvein, puberulent or glabrous, sometimes keeled, not torulose, wingless, unappendaged; gynophore obsolete or minute; replum rounded; style 0.5–2.5 mm, persistent; stigma capitate, entire, unappendaged. Seeds aseriate, wingless, ovoid to oblong, plump, smooth; seed coat not mucilaginous when wetted; cotyledons incumbent or obliquely so.
Twos species: W United States.
Reference: Rollins (1988).