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200. Chrysopogon Trinius, Fund. Agrost. 187. 1820.

金须茅属 jin xu mao shu

Authors: Shou-liang Chen & Sylvia M. Phillips

Centrophorum Trinius, nom. rej.; Pollinia Sprengel, nom. rej.; Rhaphis Loureiro, nom. rej.; Vetiveria Bory.

Perennial, tufted or with spreading rhizomes. Leaf blades mostly basal, usually narrow; ligule a short ciliolate rim or line of hairs. Inflorescence a lax terminal panicle; primary branches whorled, filiform, usually unbranched, each bearing a raceme; racemes composed of few to many spikelet pairs, or more usually reduced to a triad of 1 sessile bisexual spikelet flanked by 2 pedicellate male or barren spikelets; rachis internodes and pedicels slender. Sessile spikelet laterally compressed; callus elongate, acute to pungent, usually bearded; lower glume cartilaginous to leathery, often spinulose; upper glume boat-shaped, usually shortly awned; lower floret reduced to an empty hyaline lemma; upper lemma entire or 2-toothed, awned from apex or sinus or infrequently awnless; awn geniculate, glabrous to pubescent. Pedicelled spikelet dorsally compressed, well developed or reduced, male or barren.

Forty-four species:tropical and warm-temperate regions of the Old World, mainly in Asia and Australia, one species in the SE United States (Florida) and Cuba; four species (one introduced) in China.

Vetiveria has traditionally been separated from Chrysopogon on the basis of its longer racemes composed of a number of spikelet pairs in addition to the terminal triad. However, it has long been known that intermediates exist, and present knowledge of the group shows that separation into two genera is no longer tenable.


1 Racemes composed of 5–13 spikelet pairs and a terminal triad; callus rounded, subglabrous; plant cultivated   1 C. zizanioides
+ Racemes reduced to a triad of 1 sessile and 2 pedicelled spikelets (rarely with 1–4 spikelet pairs); callus pungent, bearded; plant wild   (2)
       
2 (1) Lower glume of sessile spikelet tuberculate-spinulose; sessile spikelets ca. 7 mm; culms robust, often more than 1 m tall.   2 C. gryllus
+ Lower glume of sessile spikelet not spinulose; sessile spikelets 4–6 mm; culms 20–90 cm tall   (3)
       
3 (2) Upper lemma of sessile spikelet with geniculate 4–6 cm awn; pedicels with golden hairs.   3 C. orientalis
+ Upper lemma of sessile spikelet with straight 0.4–0.7 cm awn; pedicels glabrous.   4 C. aciculatus

Lower Taxa


 

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