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| Hsuehochloa calcarea (C. D. Chu & C. S. Chao) D. Z. Li & Y. X. Zhang
in Zhang, Ma & Li, 2018.
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Abstract
Ampelocalamus calcareus is a climbing and slender bamboo, known from south Guizhou, China. This species grows in broadleaved forests of limestone montane areas. Recent molecular phylogenetic analyses demonstrated that A. calcareus was sister to all other lineages of the tribe Arundinarieae rather than a member of Ampelocalamus. The morphological features and habitats of A. calcareus and related genera including Ampelocalamus, Drepanostachyum and Himalayacalamus were compared and discussed. The characteristics of the branch complements, nodes and foliage leaves distinguish A. calcareus from morphologically similar taxa. On the basis of molecular and morphological evidence, we propose to establish a new genus, Hsuehochloa, to accommodate A. calcareus and to honour the late Chinese bamboo taxonomist Chi-Ju Hsueh (Ji-Ru Xue). In addition, we describe the inflorescence of Hsuehochloa for the first time.
Keywords: Ampelocalamus, climbing bamboos, Hsuehochloa, new genus
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| Figure 1. Hsuehochloa calcarea. A, B Habit and habitat C Clump D Young culm with white pubescence E, F Branch complement G Culm sheath H Leaves I Inflorescence J Floret
(A–D, G from P. F. Ma & Z. M. Cai 10050 E, F, H from seedlings introduced from Libo, Guizhou, China I, J from P. F. Ma s.n). Scale bars: 5 cm (A–C); 0.5 cm (D, G); 2 cm (E, F); 1 cm (H, I); 1mm (J).
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Hsuehochloa D. Z. Li & Y. X. Zhang, gen. nov.
Diagnosis: Hsuehochloa resembles genera Ampelocalamus, Drepanostachyum and Himalayacalamus, but differs from those genera by its thin culms (4–5 mm), fewer branches in each branch complement (1, 3–7), inconspicuous nodal sheath scar, falcate auricles and leathery foliage leaves.
Type: Hsuehochloa calcarea (C. D. Chu & C. S. Chao) D. Z. Li & Y. X. Zhang, comb. nov.
Basionym. Ampelocalamus calcareus C. D. Chu & C. S. Chao,
1983 Acta Phytotax. Sin. 21: 204–206.
Type: CHINA, Guizhou, Libo, 500 m, C. D. Chu, C. S. Chao, J. Q. Zhang & K. M. Lan 81018 (holotype, NF!; isotype, PE!)
Etymology: Hsuehochloa was named in honour of the late Prof. Chi-Ju Hsueh (Ji-Ru Xue in Pinyin transliteration) (1921–1999), a pioneer Chinese botanist on bamboos of SW China and mentor of the senior author in 1983–1986. Hsueh stands for his family name and chloa means grass.
Distribution and habitat: Endemic to south Guizhou, China, under broadleaved forests in a limestone montane area at 500–950 m altitude.
Yu-Xiao Zhang, Peng-Fei Ma and De-Zhu Li. 2018. A New Genus of Temperate Woody Bamboos (Poaceae, Bambusoideae, Arundinarieae) from A Limestone Montane Area of China. PhytoKeys. 109: 67-76. DOI: 10.3897/phytokeys.109.27566
