महकुआ (Ageratum conyzoides L.)
Common Name : Goat weed Family : Asteraceae Habit : Erect, often branched, annual herb and often decumbent; up to 120 cm tall. Stem : Much branched and rooting at the base; stem, nodes and younger parts with rather long, partly crispy hairs. Leaves : Opposite or the upper alternate, broadly ovate or rhomboid-ovate to triangular, 2-10 cm long and 1.5-5 cm wide, apex subacute, margins crenate, ciliate, base cuneate, more or less hairy on both surfaces. Flowers : Flowers in flat-topped, peduncled (5-17 mm long) corymbs (60-70 flowers). Flowers white, pale blue or violet with a disagreeable odour. Fruits : Achene oblong, 5-angular, black with pale base, glabrous or slightly hairy, 1.5-2 mm long with awn-tipped, serrate pappus-scales.