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20. Acidosasa C. D. Chu & C. S. Chao ex P. C. Keng, J. Bamboo Res. 1(2): 31. 1982.

酸竹属 suan zhu shu

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

Metasasa W. T. Lin.

Shrubby to arborescent bamboos. Rhizomes leptomorph, with running underground stems. Culms diffuse, erect; internodes terete, weakly grooved basally above branches, cavity with spongy pith; nodes weakly prominent. Branch complement 3 at mid-culm nodes, 3–5 at distal nodes. Culm sheaths deciduous, sparsely setose; auricles small or absent, with or without oral setae; blade lanceolate or triangular. Leaves usually medium-sized; auricles small or absent; blade with many secondary veins, transverse veins distinct. Inflorescence ebracteate, semelauctant, a terminal raceme or racemose panicle. Spikelets robust, several to many flowered, long pedicellate. Glumes 2–4; lemma large, many veined, apex acuminate or shortly mucronate. Palea usually shorter than lemma, 2-keeled, veined between keels. Lodicules 3, membranous, usually transparent at margin. Stamens 6; filaments free; anthers yellow. Ovary appendage inconspicuous; style 1; stigmas 3, plumose. New shoots spring–early summer, fl. summer–autumn.

About 11 species: China, Vietnam; ten species (all endemic) in China.

The generic name Acidosasa and its type, A. chinensis, were previously published by Chu and Chao (J. Nanjing Technol. Coll. Forest Prod. 1979(1–2): 142–143. 1979), but not validly so (see Li, Taxon 46: 105–107. 1997).

Key based on vegetative features

1 Culm sheath auricles absent   (2)
+ Culm sheath auricles present   (6)
2 (1) Young culm internodes hairless   (3)
+ Young culm internodes hispid or pubescent   (4)
3 (2) Culm sheath sparsely spotted, sparsely shortly hispid; sheath blade short, usually 0.5–1 cm.   1 A. breviclavata
+ Culm sheath unspotted, initially densely setose, especially at base; sheath blade long, usually 5–10 cm   2 A. purpurea
4 (2) Leaf ligule strongly prominent, 5–15 mm tall.   3 A. nanunica
+ Leaf ligule truncate, less than 2 mm tall   (5)
5 (4) Culm internodes initially densely setose, with persistent traces of bristles; apex of culm sheath narrow, about as wide as base of sheath blade; leaf blade broad, usually 2.5–6.5 cm wide, transverse veins prominent.   4 A. chinensis
+ Culm internodes apically sparsely setose initially; apex of culm sheath truncate, wider than base of sheath blade; leaf blade narrow, 1.5–2.5 cm wide, transverse veins not very distinct.   5 A. venusta
6 (1) Young culm internodes setose, shortly hispid   (7)
+ Young culm internodes without hairs   (8)
7 (6) Culm sheath with thin, white powder; supra-nodal ridge strongly prominent.   6 A. lingchuanensis
+ Culm sheath without white powder; supra-nodal ridge weakly prominent.   7 A. guangxiensis
8 (6) Culm sheath purple spotted or purple striate; ligules of culm sheaths and leaf blades prominent, 4–8 mm   8 A. notata
+ Culm sheath without spots or striae; ligules not prominent   (9)
9 (8) Culm sheath initially green; leaf blade small, 8–18 mm.   9 A. chienouensis
+ Culm sheath initially green with purple margins; leaf blade broad, 17–28 mm.   10 A. edulis

List of Keys

  • List of lower taxa


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