Dasymaschalon buengkanicum (Annonaceae), a New Species from Northeastern Thailand

Dasymaschalon buengkanicum Uearee, Damth. & Chaowasku (Annonaceae), a new species from northeastern Thailand is described and illustrated. It is morphologically most similar to D. lomentaceum, but differs from it by having sparser indumentum on young twigs, thicker and wider leaf blade, longer flowering pedicel and petals, dissimilar colour of petals at maturity, and smaller monocarp constrictions to monocarp width ratio.