Urtica dioica

Usually dioecious, perennial herb to 150 cm high; leaves and stems all markedly pubescent between the longer, scattered stinging hairs. Leaves lanceolate to ovate; base truncate to cordate; margins broadly toothed to incised, hairy; apex acute to tail-like; lamina to 12 cm long and 7 cm wide, both surfaces dark green; petiole of leaves towards base of plant 4–6 cm long, usually not more than half as long as lamina (but see below); stipules c. 10 mm long. Inflorescences unisexual, mostly longer than petiole. Flowers shortly pedicellate, c. 1 mm long, 1 mm wide, pubescent. Flowers Dec. (but probably all year).