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30. Sinobambusa Makino ex Nakai, J. Arnold Arbor. 6: 152. 1925.

唐竹属 tang zhu shu

Authors: Zheng-de Zhu, Guangyao Yang & Chris Stapleton

Arborescent or shrubby bamboos. Rhizomes leptomorph, with running underground stems. Culms diffuse, sometimes also clustering, erect to nodding; internodes substantially grooved above branches, initially usually pubescent; nodes prominent, sheath rings corky. Branches 3, rarely 5–7 at higher nodes, subequal, buds initially closed at front. Culm sheaths deciduous, setose; ligule serrate or entire; blade lanceolate. Leaves 3–9 per ultimate branch; blade lanceolate. Inflorescence fully bracteate, partially iterauctant, lateral, racemose, prophyllate. Spikelets 1–3, subtended by a prophyll and 2 to more gradually enlarged bracts or glumes, apical 1 or 2 bracts usually with axillary buds, forming secondary pseudospikelets, lateral spikelets sessile, terminal spikelet variably pedicellate. Spikelets with several to many (up to 50) florets. Rachilla disarticulating between florets. Lemma leathery, apex acute; palea about as long as lemma or slightly shorter, 2-keeled, rounded at apex, ciliolate; lodicules 3, membranous, many veined. Stamens 3, sometimes 2 or 4; filaments free. Ovary ellipsoid; style 1, sometimes absent, usually long; stigmas 2 or 3, plumose. Fruit a caryopsis.

About ten species: S and SW China, N Vietnam; introduced to Japan during the Tang Dynasty; ten species (nine endemic) in China.

Sinobambusa is very difficult to distinguish from Indosasa without knowledge of stamen number.

In addition to the species treated below, Sinobambusa glabrata W. T. Lin & Z. J. Feng (J. S. China Agric. Univ. 14(1): 47. 1993) was described from Guangdong. It is a doubtful species, and the type possibly represents a species of Bambusa. Sinobambusa scabrida T. H. Wen (J. Bamboo Res. 2(1): 61. 1983) was described from W Guangxi based on a winter-shooting specimen. It would seem that the culm sheaths were taken from newly emerged, abnormal shoots. The flowers are unknown, and the identity of this species is uncertain.

The generic placement of Sinobambusa dushanensis (species no. 10) is uncertain. It has not, therefore, been included in the following key.

1 Culm sheath auricles absent, or small and obscure   (2)
+ Culm sheath auricles well developed   (4)
2 (1) Culm sheath auricles present but obscure; culm sheath ligule yellow-green, proximally tomentose; leaf blade abaxially glabrous   9 S. incana
+ Culm sheath auricles absent; leaf blade abaxially pubescent   (3)
3 (2) Culm sheath ligule convex, purple, proximally densely setose.   7 S. rubroligula
+ Culm sheath ligule truncate, proximally tomentose.   8 S. yixingensis
4 (1) Culm internodes glabrous, sometimes papillate below nodes   (5)
+ Culm internodes pubescent   (7)
5 (4) Culm internodes and culm sheath densely pruinose initially, gray-green, culm sheath blade rugose.   3 S. farinosa
+ Culm internodes green, culm sheath light brown or yellow, light pruinose initially, culm sheath blade not rugose   (6)
6 (5) Culm internodes dark green; culm sheath blades not purple; culm sheath auricles not developed (except in var. laeta).   1 S. tootsik
+ Culm internodes pale green; culm sheath blade purple; culm sheath auricles moderately developed.   2 S. humilis
7 (4) Culm sheath initially pruinose, coarsely black glandular hairy.   4 S. henryi
+ Culm sheath initially not pruinose, purple-brown to yellow-brown setose   (8)
8 (7) Culm internodes with fine hairs; culm sheath blade glabrous.   5 S. intermedia
+ Culm internodes with coarse hairs; culm sheath blade pubescent.   6 S. nephroaurita

  • List of lower taxa


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