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FOC | Family List | FOC Vol. 22 | Poaceae

178. Cenchrus Linnaeus, Sp. Pl. 2: 1049. 1753.

蒺藜草属 ji li cao shu

Authors: Shou-liang Chen & Sylvia M. Phillips

Annuals or perennials. Culms usually branched near the base. Leaf blades usually flat; ligule a ciliate rim. Inflorescence spikelike, cylindrical, composed of spiny or bristly deciduous burrs arranged along an angular, often sinuous rachis; burrs sessile or with an obconical basal stipe, each composed of 1 or more sessile spikelets surrounded by an involucre of spines and bristles; bristles flexuous or more often spinous, ± flattened, grooved on the outer face, united below, the degree of union varying from a small basal disk to a deep cupule, inner spines or bristles often ciliate around spikelets. Spikelets lanceolate, acute; glumes unequal, shorter than spikelet, lower sometimes suppressed; lower floret membranous, staminate or neuter; upper floret firmer, protogynous. Lodicules absent.

Twenty-three species:tropical and warm-temperate regions of the world; four species (all introduced) in China.

1 Inner spines of burr extended beyond spikelets as long, slender bristles, connate only at base; outer bristles often longer than spikelets, numerous.   1 C. ciliaris
+ Inner spines of burr stiff, flattened, connate to form a deep cupule; outer bristles shorter than inner spines or absent   (2)
2 (1) Burr consisting of several whorls of connate, flattened spines, free tips emerging at irregular intervals over body of burr.   2 C. incertus
+ Burr consisting of 1 whorl of connate, flattened spines, usually surrounded by whorls of smaller, finer bristles   (3)
3 (2) Spines of burr retrorsely barbed, tenaciously prickly; outer bristles many.   3 C. echinatus
+ Spines of burr antrorsely barbed; outer bristles few or absent.   4 C. setigerus

Lower Taxa


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