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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).
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Key based on vegetative features
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| 1 |
Culm sheath auricles absent |
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(2) |
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Culm sheath auricles present |
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(6) |
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| 2 (1) |
Young culm internodes hairless |
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(3) |
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Young culm internodes hispid or pubescent |
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(4) |
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| 3 (2) |
Culm sheath sparsely spotted, sparsely shortly hispid; sheath blade short, usually 0.5–1 cm. |
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1 A. breviclavata |
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Culm sheath unspotted, initially densely setose, especially at base; sheath blade long, usually 5–10 cm |
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2 A. purpurea |
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| 4 (2) |
Leaf ligule strongly prominent, 5–15 mm tall. |
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3 A. nanunica |
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Leaf ligule truncate, less than 2 mm tall |
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(5) |
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| 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. |
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4 A. chinensis |
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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. |
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5 A. venusta |
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| 6 (1) |
Young culm internodes setose, shortly hispid |
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(7) |
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Young culm internodes without hairs |
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(8) |
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| 7 (6) |
Culm sheath with thin, white powder; supra-nodal ridge strongly prominent. |
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6 A. lingchuanensis |
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Culm sheath without white powder; supra-nodal ridge weakly prominent. |
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7 A. guangxiensis |
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| 8 (6) |
Culm sheath purple spotted or purple striate; ligules of culm sheaths and leaf blades prominent, 4–8 mm |
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8 A. notata |
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Culm sheath without spots or striae; ligules not prominent |
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(9) |
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| 9 (8) |
Culm sheath initially green; leaf blade small, 8–18 mm. |
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9 A. chienouensis |
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Culm sheath initially green with purple margins; leaf blade broad, 17–28 mm. |
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10 A. edulis |
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List of Keys
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List of lower taxa
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Treatments in Other Floras @ www.efloras.org
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