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FOC | Family List | FOC Vol. 22 | Poaceae

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.

1 Culms dwarf, ca. 1 m, 3–6 mm in diam., culm sheath initially pink.   9 G. rutilans
+ Culms tall, 1–6 m, more than 10 mm in diam   (2)
2 (1) Young culms glabrous; culm sheath auricles small or weak   (3)
+ Young culms hairy; culm sheath auricles present or absent   (4)
3 (2) Culm sheath auricles weak, oral setae radiate; leaf blade 1.2–2.2 cm wide, secondary veins 4- or 5-paired.   1 G. stellatus
+ Culm sheath auricles small, oral setae not radiate; leaf blade 2–3.5 cm wide, secondary veins 7–9-paired.   2 G. kunishii
4 (2) Young culms setose, especially at basal nodes   (5)
+ Young culms pubescent, not setose   (6)
5 (4) Culms ca. 5 m, to 3 cm in diam., internodes 50–70 cm; leaf blade 28–40 cm.   3 G. longiinternodus
+ Culms 1–3 m, 0.7–1.5 cm in diam., internodes 30–40 cm; leaf blade 14–22 cm.   4 G. latifolius
6 (4) Culms solid; culm sheath auricles elliptic; culm sheath oral setae radiate, ca. 5 mm.   8 G. solidus
+ Culms hollow; culm sheath auricles and oral setae absent   (7)
7 (6) Leaves 2–4 or more per ultimate branch; sheath subglabrous.   7 G. multifolius
+ Leaves mostly 1 or 2 per ultimate branch, rarely 4-leaved; sheaths sparsely streaked with diverse colors   (8)
8 (7) Culm sheaths distally finely purple-brown checkered.   5 G. tessellatus
+ Culm sheaths generally darker, with pale elliptical blotches.   6 G. annulatus

Lower Taxa


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