Didymocarpus xuanlienensis, a new species of Didymocarpus (Gesneriaceae) from Vietnam

Didymocarpus xuanlienensis, a new species from Vietnam, is described and illustrated here. It is morphologically similar to D. brevipedunculatus and D. purpureobracteatus in terms of corolla size and color but differs from D. brevipedunculatus in leaf blade shape, bract shape, indumentum, and calyx shape and differs from D. purpureobracteatus in peduncle indumentum, bract shape, and calyx shape. A detailed morphological description of the new species and a key to all Didymocarpus species in Vietnam are provided.