1. (noun) umbrella sedge, Cyperus eragrostis - tufted leafy sedge, with triangular stems up to 90 cm tall, leaves arranged in threes, with a group of 5 to 7 green round flowerheads, each made up of broad flattened flower spikes, with 5 to 8 long grass-like leaves immediately under this, at the end of flower stalk. Scattered throughout both islands, locally abundant in wet areas such as the banks of rivers and streams, swamps and ditches.