The Collaborative International Dictionary
Cyperus longus
Galingale \Gal"in*gale\, n. [See Galangal.] (Bot.)
A plant of the Sedge family ( Cyperus longus) having
aromatic roots; also, any plant of the same genus.
--Chaucer.
Meadow, set with slender galingale.
--Tennyson.
Wikipedia
Cyperus longus
Cyperus longus is a species of sedge known by the common name galingale. It is a tall plant, growing up to a metre in height, with creeping rhizomes and erect, triangular stems, each terminating in an inflorescence. The species is native to southern England, south Wales, and western France. It grows in shallow water or on damp ground, such as at pond edges.