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FOC | Family List | FOC Vol. 22 | Poaceae

202. Capillipedium Stapf in Prain, Fl. Trop. Africa. 9: 169. 1917.

细柄草属 xi bing cao shu

Authors: Shou-liang Chen & Sylvia M. Phillips

Perennial or annual. Culms erect, decumbent or rambling. Leaf blades linear, sometimes aromatic; ligule membranous, margin ciliolate. Inflorescence a terminal open panicle with elongate central axis; branches capillary, subdivided, each branchlet tipped by a short raceme; racemes with 1–5(–8) spikelet pairs, often reduced to triads of 1 sessile and 2 pedicelled spikelets, basal homogamous spikelet pairs absent; rachis internodes and pedicels slender, with a median translucent stripe between thickened margins. Sessile spikelet dorsally compressed; callus very short, obtuse, shortly bearded; lower glume cartilaginous, broadly convex to slightly concave, flanks rounded, keeled toward apex, apex acute to obtuse; upper glume boat-shaped, dorsally keeled; lower floret reduced to a small empty hyaline lemma; upper lemma stipitiform, entire, awned from apex; awn geniculate, glabrous or puberulous. Pedicelled spikelet male or barren, similar to the sessile or smaller, herbaceous.

About 14 species: E Africa, tropical Asia, Australia; five species (one endemic) in China.

This homogeneous genus is distinguished from Bothriochloa by the combination of an elongate inflorescence and few-spiculate racemes.

1 Sessile spikelet 2.6–3 mm   (2)
+ Sessile spikelet 3–3.8 mm   (3)
2 (1) Culms woody, 1.5–3.5 m tall; pedicelled spikelet 1/2–2 times longer than sessile spikelet.   1 C. assimile
+ Culms herbaceous, 0.5–1.1 m tall; pedicelled spikelet equal to sessile spikelet or slightly longer.   2 C. kuoi
3 (1) Culms up to 30 cm, much branched; nodes glabrous; leaf blades 6–10 cm; lower glume of sessile spikelet acute or bidentate.   3 C. kwashotense
+ Culms up to 120 cm, not or little branched; nodes bearded; leaf blades 15–30 cm; lower glume of sessile spikelet obtuse   (4)
4 (3) Racemes 1(–3)-noded, with 1(–3) sessile spikelets; lower glume of sessile spikelet 2-veined and channeled on back.   4 C. parviflorum
+ Racemes 3–8-noded, with more than 3 sessile spikelets; lower glume of sessile spikelet often 4–5-veined and flat on back.   5 C. spicigerum

Lower Taxa


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