Monday, September 25, 2017

[Botany • 2017] Gelidocalamus xunwuensis • A New Species (Poaceae, Bambusoideae) from southeastern Jiangxi, China

Gelidocalamus xunwuensis  W.G.Zhang & G.Y.Yang

Gelidocalamus xunwuensis W.G.Zhang & G.Y.Yang, a new species collected from Xunwu County of Jiangxi Province in China, is described and illustrated. The new species is similar to G. stellatus in the habit, but differs by internodes sparsely hairy with granuliferous warts, culm sheath stiffly hairy, culm sheath blade broadly lanceolate to narrowly triangular, each node with a ring of appressed trichomes below, foliage leaves broadly lanceolate to narrowly oblong, and new shoots occurring in late October.

Keywords: Arundinarieae, Bambusoideae, bamboo, leaf epidermis, SEM, taxonomy

Figure 4. Gelidocalamus xunwuensis.
A habitat plants B new shoot CL detailed characters, show branch and branch sheath (CD), transection of culm and pith-cavity (E), culm and its leaf sheath (FJ), buds (K) and foliage leaf (L). Scale bar: 5 cm (A–D, F, L), 5 mm (E, G–K).

Gelidocalamus xunwuensis W.G.Zhang & G.Y.Yang, sp. nov.

Diagnosis:  Similar to G. stellatus Wen (1982: 22) in the habit and branch, but differs by culms sparsely hairy (early period) with granuliferous warts (adult or later period), each node with a ring of fulvous appressed trichomes below, culm leaf sheath densely hispidulous with a blade broadly lanceolate and 3–5–paired oral setae, branch sheath glabrous, foliage leaves broadly lanceolate to narrowly oblong, and new shoots late October.

Etymology:  The species epithet xunwuensis refers to the locality of the type specimen: Xunwu County, Jiangxi, China.

Distribution and habitat:  Gelidocalamus xunwuensis occurs under evergreen broad-leaved forests, along ravine, and roadsides at elev. ca. 400–600 m. It grows together with Castanopsis kawakamii Hay., Dicranopteris pedata (Houtt.) Nakaike, Gnetum parvifolium (Warb.) C. Y. Cheng & Chun, Eurya chinensis R. Br., Semiliquidambar cathayensis H. T. Chang, and Ormosia semicastrata Hance. Gelidocalamus xunwuensis is currently known from only one small populations (less than 100 culms) in the southern China.

 Wen-Gen Zhang, Xue-Nan Ji, Yu-Guang Liu, Wei-Jian Li and Guang-Yao Yang. 2017. Gelidocalamus xunwuensis (Poaceae, Bambusoideae), A New Species from southeastern Jiangxi, China. PhytoKeys. 85: 59-67.  DOI:  10.3897/phytokeys.85.13804

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