काँस/टाइगर घास (Polygonum barbatum)
P. barbatum is a herbaceous perennial weed, branching and tillering from the base, basal branches creeping and rooting, other branches erect, 40-80 cm tall. Stem cylindrical, hollow, thickened at the nodes, glabrous to appressed pilose; ochrea tubular, amplexicaul, tight, often torn, 1.5-2.5 cm long, membraneous, the many strong nerves extended into filiform, 0.5-2 cm-long appendages. Leaves entire, helically arranged, shortly petioled, oblong to lanceolate, with acute to obtuse or subcordate base and acute apex; sometimes with brown spot, with many transparent ascendent lateral nerves, both sides more or less densely long- or short-appressed hairy, or glabrous above, 8-20 x 1.5-3 cm. Inflorescence terminal and in the upper axils; sparingly branched, the raceme erect, 2-8 spikes combined into dense, cylindrical pseudo-spikes, 2-6 cm x 7-8 mm; lower pseudo-spikes peduncled, upper ones sessile.