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.
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.
by its inconspicuous culm sheath auricles, margins with 8 -10 mm long fi mbriations, fi mbriate ligules of culm sheath 11 -14 mm long, palea with 3 veins between and 1 vein on either side of the keels, and blunt paleaceous apex.
A new species of Dendrocalamus (Poaceae: Bambusoideae), D. phuthoensis, is described and illustrated from Phu Tho Province, Vietnam. This species is similar to D. longiligulatus, but differs by its culm sheath glabrous, culm sheath ligule 6–7 mm long, serrulate, young culms densely brown pubescent, florets 7–9, arranged in the pseudospikelet, palea 12–14 mm long, with 3 or 4 veins between keels and without veins on each wing.
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