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Nasturtium microphyllum Boenn. ex Reichenb., Fl. Germ, Exc. 683. 1832. Icon. Fl. Germ. 2, t. 50, fig. 4360. 1838; Clapham et al, l.c. 217; Hedge in Rech. f., l.c. 215.
Dictyosperma olgae Regel & Schmalh.Nasturtium officinale var. olgae (Regel & Schmalh.) BuschNasturtium uniseriatum Howard & MantonPirea olgae Dur.Rorippa microphyllum (Boenn. ex Reichb.) Hyl. ex Love & Love
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.
Fl. Per.: April July.
Syntypes: Germany: Gegend von Leipzig bei Abtnaundorf Reichenbach ; Rothenfelde, Boenninghausen..
Distribution: Europe, C. and W. Asia, Africa and America.
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).
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