4. Alyssum szowitsianum Fischer & C. A. Meyer, Index Seminum (St. Petersburg). 4: 31. 1837.
Annuals; canescent throughout, trichomes appressed, coarse, 8-16-rayed, rays often subequal. Stems often several from base, erect, ascending, or decumbent, (unbranched or few-branched distally), (0.2-)0.4-1.6(-2) dm. Cauline leaves subsessile; blade oblanceolate or linear-oblanceolate, (0.5-)0.7-1.5(-2) cm × (1-)2-4(-6) mm (gradually smaller distally), base attenuate, apex subacute. Fruiting pedicels ascending to suberect, straight, stout, 1-3(-4) mm, trichomes uniformly stellate. Flowers: sepals oblong, 1.2-1.5 × 0.5-0.6 mm, stellate-pubescent (trichomes with longer rays and appearing simple near apex); petals pale yellow, spatulate, 1.7-2 × 0.4-0.5 mm, base abruptly narrowed to claw, apex deeply emarginate, glabrous; filaments: median pairs not toothed, slightly expanded basally, lateral pair with basal appendage to 0.5 × 0.1 mm, often apically 2-toothed, 1.4-1.7 mm; anthers ovate, 0.1-0.2 mm. Fruits ovate-oblong, (3-)3.5-5 × (2.5-)3-4 mm, apex obtuse; valves uniformly inflated at middle, broadly flattened at margins, densely stellate-pubescent (rays equal); ovules 2 per ovary; style (slender), 0.3-0.5 mm, basally stellate-pubescent. Seeds ovoid, compressed, 1.6-1.9 × 1.2-1.6 mm, margins winglike, 0.1-0.3 mm wide. 2n = 16.
Flowering May. Rocky soil; 1500-2000 m; introduced; Utah; sw Asia.
Alyssum szowitsianum is known in the flora area only from Salt Lake County.