Two new species of Gigantochloa (Poaceae: Bambusoideae) from Yunnan, China Author Qin, Qiao-Mei 0000-0002-0567-8123 qmqin @ foxmail. com; https: // orcid. org / 0000 - 0002 - 0567 - 8123 qmqin@foxmail.com Author Tong, Yi-Hua 0000-0002-5034-005X Key Laboratory of Plant Resources Conservation and Sustainable Utilization & Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China & Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China & yh-tong @ scbg. ac. cn; https: // orcid. org / 0000 - 0002 - 5034 - 005 X yh-tong@scbg.ac.cn Author Zeng, Yi 0000-0003-2431-0292 No. 2 Middle school of Zhuzhou, Zhuzhou 412007, Hunan, China & 349848599 @ qq. com; https: // orcid. org / 0000 - 0003 - 2431 - 0292 349848599@qq.com Author Cai, Zhuo-Yu 0000-0001-9288-0882 Key Laboratory of Plant Resources Conservation and Sustainable Utilization & Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China & Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China & University of Chinese Academy of Sciences, Beijing 100049, China & caizhuoyu @ scbg. ac. cn; https: // orcid. org / 0000 - 0001 - 9288 - 0882 caizhuoyu@scbg.ac.cn Author Ni, Jing-Bo 0000-0002-1695-6141 Key Laboratory of Plant Resources Conservation and Sustainable Utilization & Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China & No. 2 Middle school of Zhuzhou, Zhuzhou 412007, Hunan, China & zzxx 8424 b @ 126. com; https: // orcid. org / 0000 - 0002 - 1695 - 6141 Author Xia, Nian-He 0000-0001-9852-7393 Key Laboratory of Plant Resources Conservation and Sustainable Utilization & Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, Guangdong, China & No. 2 Middle school of Zhuzhou, Zhuzhou 412007, Hunan, China & nhxia @ scbg. ac. cn; https: // orcid. org / 0000 - 0001 - 9852 - 7393 nhxia@scbg.ac.cn text Phytotaxa 2023 2023-09-21 616 1 79 88 http://dx.doi.org/10.11646/phytotaxa.616.1.6 journal article 10.11646/phytotaxa.616.1.6 1179-3163 8389459 Key to the species of Gigantochloa in China 1a. Branches several, without a dominant branch; leaf sheath outer ligule more than 2 mm tall. 2a. Culm sheath ligule less than 5 mm tall; auricle more than 2 mm tall. 3a. Culm sheath blade reflexed; auricle prismatic, up to 10 mm wide; ligule entire; leaf sheath ligule more than 2 mm tall.................. ......................................................................................................................................................................................... 1. G. callosa 3b. Culm sheath blade erect; auricle oblong, 6–7 mm wide; ligule dentate; leaf sheath ligule less than 2 mm tall.................................. ......................................................................................................................................................................................2. G. manensis 2b. Culm sheath ligule 10 mm tall; auricle linear, 10 mm wide, less than 1 mm tall ............................................... 3. G. brachystachya 1b. Branches with a dominant branch; leaf sheath outer ligule less than 1 mm tall. 4a. Abaxial culm sheath with stripes, ligule less than 10 mm tall. 5a. Culm sheath abaxially sparsely hispid with brown to black deciduous hairs, strigose; blade erect; auricle narrowly falcate; ligule 6–10 mm tall.................................................................................................................................................................. 4. G. glabrata 5b. Culm sheath abaxially densely dark brown hispid; blade reflexed; auricle oval; ligule ca. 4 mm tall .................... 5. G. nigrociliata 4b. Abaxial culm sheath without stripes, ligule more than 10 mm tall. 6a. Intranodes glabrous; culm sheath blade reflexed; auricle more than 10 mm wide ................................................... 6. G . albociliata 6b. Intranodes with hairs; culm sheath blade erect; auricle less than 10 mm wide. 7a. Branching from 8–10 th nodes above ground; infranodes glabrous; abaxial culm sheath with sparsely black strigose; blade lanceolate; leaf sheath densely brown strigose.......................................................................................................................................7. G. felix 7b. Branching from 13-15 th nodes above ground; infra nodes with a ring of wihte hairs; abaxial culm sheath with sparsely brown strigose; blade oval lanceolate; leaf sheath glabrous...................................................................................................8. G. parviflora