Description
A small annual 3- 20 cm tall, sparely to densely pubescent herb. Stem branched striate, pubescent, the lateral branches overtopping the main axis. Radical leaves long petioled, withering early, base with hyaline ciliate margins; cauline leaves shortly petiolate, 1- or 2- ternate, pinnatisect, segments oblong to oval, cuneate, base papery with ciliate hairy on margins, margins toothed, apex mucronate, softly pubescent. Umbels leaf-opposed or terminal. Peduncle elongate, striate, 5-8 cm long covered with spreading hairs. Rays 8-12, striate, softly hairy. Involucure of 5-6 nearly straight acuminate bracts, ± 2 × 0.2– 0.5 mm, margins scarious, hairy; Involucel of 5-6 spreading, abruptly pointed to acuminate bractlets, ± 1.4 × 0.5– 0.8 mm, margins scarious, midrib green, hairy. Flowers pedicellate, white with purple tinge. Calyx, adnate to ovary reduced. Corolla polypetalous with 5 subequal petals, white tinged purple, marigns slightly irregular, emerginate with pointed beak. Androecium with 5 free stamens, alternipetalous, anthers bithecous inflexed in bud, filament become arc shaped at maturity. Pollens rectangular or subrectagular with rugulate equatorial region. Ovary bicarpellary, syncarpous, inferior, bilocular, hairy, styles ± 1 mm long, dark purple, smooth, shining, stigmas somewhat capitate. Fruits ovoid or oblong, 1.4- 2. 0 × 0.8– 1.1 mm long schizocarp, hairy, hairs 1.1–2.4 mm long, terminally T-shaped with glochidiate base, primary ridges more prominent than secondary, slightly winged.