Two new species of Gigantochloa (Poaceae: Bambusoideae) from Yunnan, China

Two new species of Gigantochloa (Poaceae: Bambusoideae) from Yunnan, China, namely Gigantochloa brachystachya and G. maneensis, are described and illustrated. G. brachystachya is morphologically similar to G. levis, but differs in its infranodal region with a ring of white hairs, culm leaf with erect blade, linear and glabrous auricle being ca. 10 mm wide and less than 1 mm tall, and glabrous ligule being 5-10 mm tall, and foliage leaf with glabrous sheath, 3-5 mm tall ligule and 2-2.5 mm tall outer ligules. Gigantochloa maneensis is morphologically similar to G. callosa, but differs in its intranode and infranodal region both with a ring of white hairs, culm leaf with densely black-hispid sheath abaxially and without stripes, erect blade and oblong auricle being 6-7 mm wide, and sparsely brown-hispid foliage leaf sheaths.