SANDBERGIA Greene, Leafl. Bot. Observ. Crit. 2: 136. 1911.
Ihsan A. Al-Shehbaz
Tribe: Boechereae Al-Shehbaz, Beilstein & E. A. Kellogg, Pl. Syst. Evol. 259: 111. 2006.
Name derivation: For John H. Sandberg, 1848–1917, American who collected extensively in the Pacific Northwest.
Type Species: Sandbergia whitedii (Piper) Greene (based on Arabis whitedii Piper).
Herbs, biennial or perennial with caudex. Trichomes short-stalked or subsessile, cruciform, Y-shaped, or forked. Multicellular glands absent. Stems erect or decumbent, simple or branched above. Basal leaves petiolate, mostly rosulate, simple, entire, dentate, or lyrate-pinnatifid; cauline leaves sessile, not auriculate or sagittate, entire, dentate, or pinnatifid. Racemes several-flowered, ebracteate, corymbose, elongated considerably in fruit; rachis straight; fruiting pedicels ascending to subdivaricate, persistent. Sepals oblong, free, caducous, erect, equal, base of lateral pair not saccate. Petals white, erect at base, longer than sepals; blade oblanceolate to spatulate, apex obtuse; claw obscurely differentiated from blade, shorter than sepals, glabrous, unappendaged, entire. Stamens 6, slightly exserted, slightly tetradynamous; filaments wingless, unappendaged, glabrous, free; anthers ovate or oblong, obtuse at apex. Nectar glands confluent, subtending bases of all stamens; median glands present. Ovules 12–30 per ovary. Fruit dehiscent capsular siliques, linear, subterete to strongly flattened parallel to septum, not inflated, unsegmented; valves not thickened, without or with obscure midvein along the proximal half, pubescent or glabrescent, not keeled, slightly to strongly torulose, wingless, unappendaged; gynophore less than 1 mm; replum rounded, visible; septum complete, membranous, not veined; style obsolete or to 1.3 mm; stigma capitate, entire, unappendaged. Seeds uniseriate, wingless, oblong, plump; seed coat minutely reticulate, not mucilaginous when wetted; cotyledons incumbent. x = 7.
Two species: NW United States.
Reference: Al-Shehbaz (2007), Rollins (1943).