Isatis costata C.A.Mey. in Ledeb.,Fl-Alt. 3:204. 1831. Hook.f., l.c. 163; Busch in Kom., l.c. 218; Tutin et al, Fl.Europ. 1 :269.1964.
Annual or biennial, 40-120 cm tall, erect, much branched above, apparently glabrous, subglaucous. Basal leaves obovate-oblong, 8-14 cm long, 2-3 cm broad, subsessile, apex rounded, margin entire or obscurely dentate; cauline leaves a little smaller, lanceolate, auricled at base, amplexicaul, entire; all leaves glabrous or sparsely ciliately hairy with simple hairs. Racemes ± similar to the above species. Flower 3-4 mm across, yellowish. Sepals 1.5-1.7 mm long, c. 1 mm broad. Petals 2.5-3 mm long, 1.5-2 mm broad; Siliculae oblong-obovate, or oblong elliptic, 10-15 mm long, 4-6 mm broad, glabrous or minutely pubescent; apex± rounded; locules somewhat elongated, usually as long or a little longer than the upper portion of the wing, midrib ± 3-ridged; seed c. 3 mm long, 1 mm broad, oblong-ellipsoid, brown.
Differs from the previous species by its siliculae with ± rounded apex and base, not cuneate below the locule, and wall of the locule ± 3-ridged.
Fl. Per.: May-August.
Type: Altai, Ledebour (LE, K).
Distribution: C.Asia, Kashmir and Pakistan.