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Diarthron vesiculosum C.A. Mey. in Bull. Phys. Math. Acad. Petersb. 1:359. 1843. Hook. f., l.c.; Boiss., l.c.; Parsa, l.c.; Bamber, Pl. Punj., l.c.; Webb and Ferguson, l.c.
Diarthron carinatum Jaub. and Spach.Passerina vesiculosa F. & M.
Slender annuals up to 45 cm tall. Stem dichotomous, glabrous, woody below; branches ascending. Leaves 7-20 mm long, 1-3 mm broad, linear to lanceolate, scattered. Flowers greenish yellow, in short terminal and extra axillary racemes 2.5-11 cm long; pedicel c. 1 mm long. Calyx tube c. 4 mm 6 long, urceolate, constricted into a narrow tube above ovary, 4 lobed; lobes 1 mm long, acute. Upper 4 stamens antisepalous. Ovary c. 1.5 mm long; style 1 mm long, linear. Fruit 2 mm long, ovoid, shiny black.
Fl. Per. April-May.
Type: `in Turcomannia et Persia boreali, Karelin 790.'.
Distribution: E. Europe, Caucasus, Turkey, Iran, Afghanistan, W. Pakistan and Sungaria in C. Asia.
A common annual weed which grows in dry fields in the spring from 400-2400 m alt. s.m.
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