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26. Gelidocalamus T. H. Wen, J. Bamboo Res. 1(1): 21. 1982.
短枝竹属 duan zhi zhu shu
Authors: Zheng-de Zhu & Chris Stapleton
Shrubby bamboos. Rhizomes leptomorph, with running underground stems. Culms pluricaespitose, erect; internodes terete; nodes weakly prominent. Branches 7–12 per node, rarely more than 20, slender, without secondary branching. Culm sheaths persistent, much shorter than internodes; auricles absent or conspicuous; ligule arched or truncate, short; blade broadly conical or narrowly lanceolate. Leaves usually solitary on each branch; sheaths narrow, closely appressed to branchlets and inconspicuous, usually solitary or rarely 2 or more; blade lanceolate or broadly lanceolate to elliptical, short transverse veins distinct. Inflorescence paniculate, large, open, terminal to leafy branches. Spikelets mostly light green, small, 3–5-flowered; pedicel slender. Rachilla compressed. Glumes 2; lemma compressed laterally, ridged abaxially; palea 2-keeled, truncate at apex; lodicules 3. Stamens 3; filaments free. Stigmas 2, or rarely 1, plumose. Caryopsis globose, beaked. New shoots autumn–winter.
* Nine species: China.
In addition to the species treated below, Gelidocalamus dongdingensis C. F. Huang & C. D. Dai (Wuyi Sci. J. 8: 173. 1991) was described from Fujian (Wuyi Shan), but no specimens have been seen by the authors and this taxon must be left as a doubtful species. Gelidocalamus velutinus W. T. Lin (Acta Phytotax. Sin. 26: 233. 1988) was described from Guangdong (Yunan). This plant has 14–16 branches per node and distinctive, oblong culm sheath auricles, and looks more like a species of Pleioblastus than a Gelidocalamus.
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| 1 |
Culms dwarf, ca. 1 m, 3–6 mm in diam., culm sheath initially pink. |
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9 G. rutilans |
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Culms tall, 1–6 m, more than 10 mm in diam |
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(2) |
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| 2 (1) |
Young culms glabrous; culm sheath auricles small or weak |
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(3) |
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Young culms hairy; culm sheath auricles present or absent |
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(4) |
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| 3 (2) |
Culm sheath auricles weak, oral setae radiate; leaf blade 1.2–2.2 cm wide, secondary veins 4- or 5-paired. |
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1 G. stellatus |
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Culm sheath auricles small, oral setae not radiate; leaf blade 2–3.5 cm wide, secondary veins 7–9-paired. |
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2 G. kunishii |
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| 4 (2) |
Young culms setose, especially at basal nodes |
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(5) |
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Young culms pubescent, not setose |
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(6) |
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| 5 (4) |
Culms ca. 5 m, to 3 cm in diam., internodes 50–70 cm; leaf blade 28–40 cm. |
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3 G. longiinternodus |
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Culms 1–3 m, 0.7–1.5 cm in diam., internodes 30–40 cm; leaf blade 14–22 cm. |
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4 G. latifolius |
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| 6 (4) |
Culms solid; culm sheath auricles elliptic; culm sheath oral setae radiate, ca. 5 mm. |
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8 G. solidus |
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Culms hollow; culm sheath auricles and oral setae absent |
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(7) |
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| 7 (6) |
Leaves 2–4 or more per ultimate branch; sheath subglabrous. |
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7 G. multifolius |
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Leaves mostly 1 or 2 per ultimate branch, rarely 4-leaved; sheaths sparsely streaked with diverse colors |
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(8) |
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| 8 (7) |
Culm sheaths distally finely purple-brown checkered. |
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5 G. tessellatus |
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Culm sheaths generally darker, with pale elliptical blotches. |
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6 G. annulatus |
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Lower Taxa
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