A new species of Gesneriaceae, Didymocarpus phuquocensis, is described and illustrated from Phu Quoc National Park, Kien Giang Province, South-western Vietnam. It is most similar to D. pulcher, D. hookeri and D. punduanus in having 3-verticillate petiolate leaves, morphologically similar calyx, corolla, stamens, pistil and fruit, but differs from all in the glandular-pubescent stems, petioles and leaf blades, 1(-2)-flowered cymes, longer corolla and fruit and longer and densely glandular-puberulent ovary. Data on distribution, ecology, phenology and provisional conservation assessment of the new species are given along with an illustration and a colour plate.
Keywords: Didymocarpus; Kien Giang; Vietnam; new species; taxonomy.
Thi-Lien Tran, Ngoc-Sam Ly, Minh-Ngoc Tran, Xuan-Truong Nguyen, Ngoc-Giang Cao, Hong-Dung Pham.