Proceedings of the New Zealand Ecological Society (1968) 15: 51- 54

Environmental effects on the sex ratio of Rumex acetosella L.

Research Article
W. Harris 1,2
  1. Botany Department, University of Canterbury, Christchurch
  2. Present address: Grasslands Division, Department of Scientific and Industrial Research, Palmerston North

Observations on the ratio of staminate to pistillate individuals of Rumex aeetosella from a variety of sources indicate the predominance of males. Results from forty-four sites in the South Island of New Zealand suggest the sex ratio is affected by the environment, and this is related to differences in the intensity of competition at roadside, new pasture and tussock grassland sites. Results for the sex ratio are related to the height differences between staminate and pistillate individuals.