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.