Herb, up to 1 m high. Leaves ovate, up to 100 x 45 mm, distinctly petioled, with petioles up to 90 mm long, acuminate, serrate. Teeth of female flowers lanceolate, often contiguous and apically directed. Flowers green.
The allomorphic female flowers always have the fimbriate whorls, instead of just sometimes as in A. ciliata.