Draba alyssoides Humb. & Bonpl. in DC., Syst. Nat. 2: 355. 1821.   TYPE: Colombia, Pasto, bei Zapayes, Guachucal and Quarchu, F. W. H. A. von Humboldt & A. J. A. Bonpland 2188 (holotype, P-Bonpl.!; isotype, B-W 11800!).

Draba alyssoides var. thlaspiformis O. E. Schulz in Engler, Pflanzenr. IV. 105(Heft 89): 150. 1927. TYPE: Ecuador, Prov. Imbabura, Páramo del Piñon, 4200 m, A. Stübel 619 (holotype, B).

     Subshrubs or suffrutescent perennial herbs. Stems (4–)11–35 cm, erect, stiff, simple or few branched at base, woody except for current-year growth, to ca. 5 mm in diam., covered with petiolelike bases of previous years, uppermost portions herbaceous, sparsely to densely hispid with subsessile forked or substellate trichomes often mixed with simple ones. Leaves all cauline; petiolelike base yellowish, thickened, triangular, persistent, to 2 mm, usually densely overlapping; leaf blade ovate to narrowly oblong, scabrous, 6–13(–18) × (2.5–)3–6(–8) mm, abaxially with short-stalked, rigid, forked to cruciform trichomes with unbranched rays, adaxially hirsute and sparsely to densely covered with rigid, antrorse, appressed simple trichomes 1-1.5 mm, base cuneate, margin entire or rarely with a minute tooth on each side, apex obtuse to subacute. Racemes corymbose, usually elongated in fruit; peduncle 0.5-2 mm; bracts absent or restircted to lower half of inflorescence; fruiting pedicel divaricate to ascending, straight or rarely slightly curved, pubescent, (3–)4–8(–13) mm. Sepals purple or green, erect, oblong, caducous, (2.5–)3–3.7(–4) ×1.2–1.7(–2) mm, sparsely pubescent, base of inner pair slightly saccate, apex rounded; petals white or very rarely pinkish white, obovate to rarely spatulate, 5.5–6.5(–7.5) × 2.5–3.6(–4) mm, cuneate to clawlike base, apex usually retuse to subemarginate; filaments white, slightly dilated at base, 3–3.5(–4) mm; anthers 0.5–0.7 mm; nectar glands confluent, subtending bases of all filaments; ovules 16–24 per ovary. Fruit ovate-lanceolate, flattened, (5–)7–10(–14) × 3–3.8(–5) mm; valves hirsute with antrorse simple trichomes; style (1–)1.5–2.2(–3) mm; stigma entire. Seeds dark brown, compressed, ovate, (1.1–)1.3–1.6 × 0.8–1 mm.

Flowering: most of the year.

Habitat: wet crevices of rock, open exposed rocky ridges, bunch grass, sandy grasslands, dry open slopes.

Elevation: 2800–4900.

Distribution: Ecuador (Azuay, Cañar, Carchi, Cimborazo, Cotopaxi, Imbabura, Pichincha), N Peru (Cajamarca).