Abstract
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.
Highlights
The genus Didymocarpus Wallich was established in 1819, based on the species D. primulifolius D.Don from Nepal
Didymocarpus ranges from northwest India, eastwards through Nepal, Bhutan, northeast India, Burma (Myanmar), southern China, Vietnam, Laos, Cambodia, Thailand and the Malay Peninsula, with the highest species diversity being found in China and Thailand (Weber and Burtt 1998; Weber et al 2000; Nangngam and Maxwell 2013; Nangngam and Middleton 2014; Möller et al 2016)
Didymocarpus puhoatensis X.Hong & F.Wen was described from Central Vietnam (Hong et al 2018)
Summary
The genus Didymocarpus Wallich was established in 1819, based on the species D. primulifolius D.Don from Nepal. A critical examination of living flowers, herbarium specimens of these plants and comparison with type material and protologues of all closely-related species in Vietnam and neighbouring countries (e.g. Clarke 1874, 1883, 1884; Wallich 1829; Wang et al 1998; Pham 2000; Nangngam and Maxwell 2013; Phuong et al 2014; Nangngam and Middleton 2014; Sinha and Datta 2016; Roy 2017), suggested that these specimens were different from the other known Didymocarpus species.
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