Abstract
Loxostigma puhoatense N.D. Do et al., sp. nov., a new species of Gesneriaceae, is described and illustrated from Pu Hoat Nature Reserve, Nghe An Province, Vietnam. This species is morphologically similar to L. dongxingensis and L. damingshanensis in the plant habit, indumentum system of vegetative and reproductive characters, shape of leaf blades, calyx, pistil but differs from the latter two by the abaxially reddish-purple leaf blade with pubescent along veins, lateral veins 11–19, shorter white to pale yellowish-white corolla (3.7–3.8 cm long) with purple-spotted and glabrous inside, longer abaxial stamens in 2–2.1 cm, shorter and densely glandular-puberulent ovary in 1–1.2 cm, and sparsely glandular-puberulent style. Data on distribution, ecology, phenology, and vernacular of the new species are provided.
Highlights
We conducted a critical examination of the specimens, and made a comparison with type material and protologues of presumed closely related species in Vietnam and neighboring countries (e.g. Wang 1983; Wang and Pan 1982; Pan 1988; Wang et al 1998; Grierson and Long 2001; Li and Wang 2004; Wei et al 2010; Sinha and Datta 2016). We discovered that these specimens were different from the other known Loxostigma species and presented the unknown taxon which shows similarities with L. dongxingensis and L. damingshanensis (L.Wu & B.Pan) Mich.Möller & H.Atkins in the same plant habit, indumentum of stem and shape of flower
All measurements and description of the new species are based on living flowering material and herbarium specimens collected from the type locality, supplemented with type material from the following herbaria: HITBC, HN, IBK, IBSC, K, KUN, P, PE, VNM and VNMN (herbarium codes follow Thiers (2018)) as well as digitized specimen images of Loxostigma species available on the web from Muséum National d’Histoire Naturelle
This species is most similar to L. dongxingensis and L. damingshanensis in the plant habit, indumentum system of stem, leaves, shape of leaf blades, calyx and pistil but differs from the latter two in the leaf blade with abaxially reddish-purple and number of lateral veins, longer peduncle, shorter white to pale yellowish-white corolla with purple-spotted inside, longer abaxially stamens that are lower adnate above corolla tube base, shorter and glandular-puberulent ovary, and sparsely glandular-puberulent style
Summary
We discovered that these specimens were different from the other known Loxostigma species and presented the unknown taxon which shows similarities with L. dongxingensis and L. damingshanensis (L.Wu & B.Pan) Mich.Möller & H.Atkins in the same plant habit, indumentum of stem and shape of flower. L. puhoatense somewhat pubescent broadly elliptic to elliptic-ovate, abaxially reddish-purple, sparsely pubescent on both surfaces, pubescent along veins, lateral vein 11–19 pairs pubescent branched
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