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FOC | Family List | FOC Vol. 22 | Poaceae

142. Chloris Swartz, Prodr. 25. 1788.

虎尾草属 hu wei cao shu

Authors: Bi-xing Sun & Sylvia M. Phillips

Annuals or perennials, with rhizomes or stolons. Basal leaf sheaths rounded or keeled; leaf blades linear, flat or folded; ligule a short ciliolate membrane. Inflorescence of racemes, digitate or occasionally in 2 or more whorls; spikelets shortly pedicelled or subsessile, closely imbricate, biseriate. Spikelets laterally compressed, florets 2–4, lowermost fertile, successive florets male or sterile and progressively reduced, disarticulating above glumes; glumes unequal, usually shorter than florets, lanceolate, membranous, 1-veined, acuminate to an awn-point; callus bearded; lemma of fertile floret keeled, lanceolate to obovate, cartilaginous to leathery, usually ciliate on margins and keel, apex entire or emarginate, subapically mucronate or awned; palea as long as lemma; subsequent florets similar to fertile floret or of different shape or vestigial. Caryopsis ellipsoid to subterete, pericarp free though sometimes reluctantly so. x = 10.

About 55 species: tropical and warm-temperate regions throughout the world; five species (one introduced) in China.

1 Leaf blades obtuse; lowest lemma glabrous.   1 C. pycnothrix
+ Leaf blades acute to tapering; lowest lemma hairy on margins   (2)
2 (1) Lowest lemma with spreading 2.5–4 mm hairs on upper margins.   3 C. virgata
+ Lowest lemma with 0.5–1.5 mm hairs on upper margins   (3)
3 (2) Culms 1–3 m, stoloniferous perennial; spikelets 2-awned.   2 C. gayana
+ Culms up to 1 m, tufted annuals (or weakly perennial); spikelets 3-awned   (4)
4 (3) Sterile lemmas inflated; the lower 1–1.5 mm, nearly as long as wide.   4 C. barbata
+ Sterile lemmas ± flattened; the lower 1.6–2 mm, longer than wide.   5 C. formosana

Lower Taxa


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