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FOC | Family List | FOC Vol. 22 | Poaceae

220. Eremochloa Buse in Miquel, Pl. Jungh. 357. 1854.

蜈蚣草属 wu gong cao shu

Authors: Bi-xing Sun & Sylvia M. Phillips

Perennial, tufted, stoloniferous or rhizomatous. Leaves mostly basal, leaf blades linear, flat or folded; ligule short, membranous. Inflorescence a single terminal raceme; raceme strongly flattened, spikelets overlapping along one side, disarticulating very tardily; rachis internodes narrowly clavate, nodes ciliate (in China), base truncate, sometimes with a low central peg. Sessile spikelet longer than rachis internode; lower glume elliptic-ovate to oblong, papery to leathery, 5–9-veined, marginally 2-keeled, keels pectinately spiny, often winged at apex; upper glume 3-veined, keeled along midvein, otherwise almost flat, often narrowly winged on lower keel; lower floret staminate, palea present; upper floret bisexual, upper lemma entire, awnless. Pedicelled spikelet absent or represented by a small bristle; pedicel free from and longer than adjacent internode, subulate to narrowly ovoid or leaflike.

Eleven species: India to SE Asia and Australia; five species in China.

This genus is easily recognizable by its distinctive inflorescence. The solitary, terminal, 1-sided raceme of closely overlapping spikelets does not break up readily into segments, and most species have spikelets with conspicuous, long spines along their margins.

1 Plant with elongate stolons or rhizomes; lower glume broadly winged at apex   (2)
+ Plant tufted; lower glume narrowly winged or wingless   (3)
2 (1) Keels with very short inconspicuous spines.   1 E. ophiuroides
+ Keels with long conspicuous spines.   2 E. muricata
3 (1) Lower glume of sessile spikelet usually wingless, often pubescent on back.   3 E. ciliaris
+ Lower glume of sessile spikelet narrowly winged toward apex, glabrous on back   (4)
4 (3) Longest spines of lower glume shorter than glume width, usually ca. 1 mm; nodes of rachis obviously hairy; leaf blades hairy on basal margins, apex subacute.   4 E. bimaculata
+ Longest spines of lower glume equaling or longer than glume width, 1.5–2.5 mm; nodes of rachis minutely hairy; leaf blades glabrous, apex cuspidate.   5 E. zeylanica

Lower Taxa


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