Environmental effects on the sex ratio of Rumex acetosella L.

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.