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FOC | Family List | FOC Vol. 22 | Poaceae

8. Cephalostachyum Munro, Trans. Linn. Soc. London. 26: 138. 1868.

空竹属 kong zhu shu

Authors: De-Zhu Li & Chris Stapleton

Arborescent or shrubby bamboos. Rhizomes short necked, pachymorph. Culms straight, pendulous, or occasionally clambering; internodes terete, smooth, usually glabrous; wall usually thin; nodal ridge not prominent; sheath scar prominent. Branches many, subequal or occasionally with a dominant branch replacing main culm. Culm sheaths deciduous, thickly papery to leathery, usually rigid, apex truncate or concave; auricles usually conspicuous; oral setae usually developed, often fimbriate; ligule truncate, short, serrulate; blade reflexed, sometimes erect. Leaf sheaths pubescent; auricles usually conspicuous; blade lanceolate or ovate-elliptical, variable in size, transverse veins scarcely visible. Inflorescence fully bracteate, iterauctant, initially densely glomerate with many pseudospikelets, terminal to a leafy shoot, later spicate, lateral to leafless flowering branches, subtended by several large bracts. Spikelets 1-flowered, with a rachilla extension. Glumes 2 or 3, long mucronate or awned; lemma similar to glumes, convolute. Palea thin, 2-keeled. Lodicules 3. Stamens 6; filaments free. Ovary stalked; style long, hollow; stigmas 2 or 3, plumose. Caryopsis nutlike, terete, apex with persistent style base.

About nine species: S and SE Asia; six species in China (Xizang, Yunnan).

Several early names were based on fragmentary material collected in NE India and Myanmar. The Chinese specimens cannot be reliably identified until better gatherings have been made both in China and in neighboring countries.

1 Culms climbing; culm sheath blade erect, not articulate with sheaths   (2)
+ Culms erect; culm sheath blade reflexed, articulate with sheaths   (3)
2 (1) Culm internodes solid; culm sheaths abaxially sparsely white hairy, centrally and on distal margins brown hirsute.   1 C. mannii
+ Culm internodes with narrow cavity; culm sheaths abaxially dark brown or black tomentose.   2 C. scandens
3 (1) Culm sheaths thickly leathery, brown, smooth, glossy, with dark brown hairs; culm internodes glaucous, white hispid.   3 C. pergracile
+ Culm sheaths papery to leathery, yellow, grooved, dull, pubescent or hirsute   (4)
4 (3) Leaf blade ovate to elliptical, 8–10 cm wide; culm sheath apically projecting upward on each side of blade.   4 C. latifolium
+ Leaf blade lanceolate, 2–5 cm wide; culm sheath apically truncate   (5)
5 (4) Culms 1.5–2.5 cm in diam., culm sheaths pale pubescent.   5 C. pallidum
+ Culms 5–10 cm in diam.; culm sheaths yellow hispid.   6 C. virgatum

Lower Taxa


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