A new species, Dendrocalamus velutinus N.-H. Xia, V. T. Nguyen & V. D. Vu (Poaceae) from Vietnam, is described, illustrated and discussed. It is similar to Dendrocalamus calostachyus (Kurz) Kurz in general appearance, but differs by many morphological characters.

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A new species of Dendrocalamus Nees from Vietnam, D. parvigemma N. H. Xia, V. T. Nguyen et V. L. Le, is described and illustrated. The new species is morphologically similar to D. latiflorus Munro and D. yunnanicus Hsueh & Li, from which it differs by having a very small and nearly circular culm bud, dense, 1.4–1.6 cm long, palea with bristles and apex split in 2, narrowly lanceolate ovary, and sheath ligule 5 mm heigh and irregularly serrulate.