Ecology, distribution and fertility of Carex recta Boott (Cyperaceae) in the British Isles

The rare sedge Carex recta is found on three estuaries in northeast Scotland. Field surveys and recording of associated species indicate that it thrives in different NVC. communities, ranging from mires, through tall-herb fen, rush pasture and mesotrophic grassland to salt-marsh. Seed fertility is low and varies between populations, with the highest fertility detected in the population along the River Wick where introgression occurs. The distribution is updated with one new population and the re-discovery of another.