chickenspike, wedgewort, gooseweed
not currently cultivated
Sphenoclea zeylanica Gaertn. is introduced into the United States.
Sphenoclea zeylanica can be a troublesome weed in rice worldwide.
Small to medium herb or shrub. Roots thread-like. Stem erect, branched, ± succulent, hollow, base thickened, glabrous. Leaves alternate; subsessile to petiolate; leaf blade lanceolate-elliptic to obovate-elliptic; base tapering; margin entire; glabrous. Inflorescence a terminal, dense spike; pedunculate; bracts spathulate, inflexed; bracteoles broadly linear. Flowers actinomorphic, small; sessile; only a few opening at a time. Calyx basally connate, 5-lobed, lobes obovate to triangular, imbricate, persistent; corolla campanulate, 5-lobed, lobes ovate-triangular, imbricate, usually white, or pink; stamens 5, alternating with petals; style 1, short; stigma capitate to obscurely 2-lobed; ovules numerous.
in damp to wet places; prefers stagnant water, tolerant of brackish water; along ponds, rivers, marshes, in periodically inundated swamps, also in rice fields
Sphenoclea contains just two species: Sphenoclea zeylanica Gaertn. and Sphenoclea pongatium A. DC.