Psilonema dasycarpum (Steph.ex Willd.) C.A.Mey.
Annual, 10-25 cm tall, suberect or spreading, branched, clothed with stellate appressed hairs, and some parts with short and long hairs. Leaves obovate or elliptic, (7-) 10-25 mm long, (2.5-) 4-9 mm broad, sessile, entire, acute. Racemes 15-30-flowered, up to 12 cm long in fruit. Flowers c. 2.5 mm across, pale yellow; pedicel up to 2 mm long in fruit, ascending. Sepals 2-2.5 mm long. Petals 3-3.5 mm long, oblong, apex emarginate, narrowed towards the base. Stamens c. 2.5: 2.8 mm long, filaments not appendaged. Siliculae broadly elliptic, or elliptic-ovate, usually c. 3 mm long, 2.7 mm broad; valves uniformly tumid, with an obscurely flattened margin, pubescent with dimorphic stellate hairs; style (1-) 1.5-2 mm long, tapering, straight with short, subbilobed stigma; seeds 2 in each locule, c. 1.5 mm long, ovate, brown.
Fl. Per.: March-May.
Type: Siberia, Astrkhan, Stephan (B,LE,K).
Distribution: Trans-Caspian segim, C. and S.W. Asia, Iran, Afghanistan and Pakistan.
Very variable in habit and size of infructescence. Status of the variety nimus Bornm. ex Dudley, with prostrate habit and short spathulate leaves, is not definite, because of many overlapping forms and the variation seems to he continuous and of ecological nature.