Sisymbrium thalianum (Linn.) Gay & Mann.
Annual, 5-20 (-45) cm tall, erect, simple or branched, usually from the base, often hairy below and suhglabrous above with short, branched or simple hairs. Basal leaves rosulate, obovate-oblong, 15-50 mm long, 5-10 mm broad, subsessile, slightly to distinctly toothed or entire; upper leaves, short, distant, oblong or linear, cuneate below. sessile. entire or obscurely toothed. Racemes (8-) 15-30 (-40)-flowered, up to 20 cm long in fruit. Flowers 2-3 mm across, white or pale pinkish; pedicels (5-) 8-15 mm long in fruit, filiform, subspreading or ascending. Sepals 1.5-2 mm long. Petals 3-4 mm long, 1 mm broad. Stamens 6 or 4, c. 1.5: 2.5 mm long (outer 2 sometimes suppressed) ; anthers c. 0.5 mm long. Siliquae (10-) 12-18 mm long, 1 mm broad, linear, subcylindrical, often somewhat upcurved, glabrous; valves 1-veined; stigma short, depressed, sub-sessile or on c. 0.5 mm long style; septum not veined; seeds usually 20-30 in each locule, c. 0.5 mm long.
Fl. Per.: April-June.
Type: Described from Europe, Scandinavia.
Distribution: Mediterranean region, Europe and Temp. Asia.; introduced else-where.
I have not seen any authentic specimen of this species from Baluchistan. Some forms of Arabidopsis pumila superficially look very much like this species in the absence of flowers, and Hotson's gathering from Makran (cited as Arabidopsis thaliana by Blatter et al in Journ. Ind. Bot. 1: 57. 1919) is most probably a misidentification of Arabidopsis pumila. It is a very variable species in size and some forms are without cauline leaves.