This species is confined to the N.W.F.P. area, while the previous one is present almost throughout Pakistan. Sterile hybrid between the 2 species may also be found. Hedge (l.c. 215) records it from Kohat: Lamond 1565 (E); Rech.f. 30228 (W).
Differs from Nasturtium officinale R. Br. only by its narrow, linear fruit and seed characters as mentioned in the key. This has 2n=64 (while Nasturtium officinale has 2n=32), apparently an allotetraploid of Nasturtium officinale.
Leaves and stem turn purplish in autumn. Siliquae 15-22 mm long, usually 1 mm broad., slender on up to 20 mm long pedicels, spreading; valves smooth glabrous; seeds uniseriate, c. 0.8 mm long, with c. 100 polygonal depressions on each face.
