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Genus :

COIX

Family :

POACEAE

Species of this Genus

Description


Annual or perennial, monoecious grasses, culms erect or decumbent, sometimes floating. Leaf-blades broad, ligules short. Inflorescence many in upper leaf-axils, each subtended by a globose, bony or softer utricle, each inflorescence comprising 2 racemes, a sessile female, and a pedunculate male, subtended by a prophyll. Female spikelet : lower glume broader, upper glume narrower, lower floret reduced, upper floret hyaline, both florets staminate. Male spikelets : glumes subequal, lower glume flat on back, keeled, winged above, upper glume boat-shaped. Caryopsis subglobose to ellipsoid.

Key to the species

Serial Key Reference
1a. Lower glume of the male spikelets broadly winged; spikelets 5-6 mm broad C. aquatica
1b. Lower glume of the male spikelets narrowly or hardly winged; spikelets 2-3 mm broad C. lacryma-jobi