Small Nettle, Stinging Nettle, Lesser Stinging Nettle, Dwarf Nettle
Introduced annual forb to 70cm tall, covered in stinging hairs. Leaves opposite each other, flat, 1-7cm long, 10-40mm wide, almost hairless between the stinging hairs, with toothed edges. Male and female flowers on the same plant. Flowers small (less than 3mm across), green, with 4 'petals', in short branched clusters of mixed male and female flowers.
Description and photo in G.M. Cunningham, WE Mulham, PL Milthorpe and J H Leigh (1981 and later printings) Plants of Western New South Wales pages 210-211