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| Oreocharis tetrapterus F.Wen, B.Pan & T.V.Do
in Pan, Tang, Do, et al., 2019.
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Abstract
A new species, Oreocharis tetrapterus F.Wen, B.Pan & T.V.Do (Gesneriaceae) from Gupo Mountain area, Hezhou city, Guangxi Zhuangzu Autonomous Region, China, is described and illustrated. The new species has a zygomorphic tetramerous corolla with two adaxial and two abaxial lobes and two fertile stamens in the posterior position, making this a unique combination of floral characteristics in the expanded Oreocharis.
Keywords: Didymocarpinae, Didymocarpoideae, Flora of Guangxi, Gupo Mountain Area, New taxon, Trichosporeae
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| Figure 1. Oreocharis tetrapterus F.Wen, B.Pan & T.V.Do sp. nov. A habit B lateral view of flower C adaxial surfaces of calyx lobes D opened corolla for showing the two fertile stamens in posterior position E pistil with disc, sepals removed F stigma G anthers in side view.
Drawn by Wen-Hong Lin from the holotype.
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Oreocharis tetrapterus F.Wen, B.Pan & T.V.Do, sp. nov.
Diagnosis: The large bright yellow corolla is 2 lobed with the adaxial and abaxial lips both consistently 2-lobed, with irregular dark reddish-brown spots on the interior surfaces of the corolla lobes and 2 fertile stamens in posterior position distinguishes Oreocharis tetrapterus from all other species of Oreocharis s. l.
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| Figure 2. Oreocharis tetrapterus F.Wen, B.Pan & T.V.Do sp. nov. in its natural habitat A habitat B flowering plant C plant with flowering cymes D frontal view of corolla E lateral view of corolla F top view of corolla.
Photographed by Fang Wen and Bo Pan, charted by Wen-Hua Xu.
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| Figure 4. Some species in Oreocharis with typically four corolla lobes A Oreocharis tetrapterus F.Wen, B.Pan & T.V.Do sp. nov. B O. sinensis (Oliv.) Mich.Möller & A.Weber (1 Lateral view of flowering cyme 2 Frontal view of flowering cyme) C O. esquirolii Léveillé (1 Corolla with four lobes and four stamens 2 Corolla with five lobes and five stamens).
Photographed by Fang Wen and Bo Pan, charted by Wen-Hua Xu.
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Etymology: The specific epithet, ‘tetrapterus’ from the Greek meaning having four wings or wing-like appendages. Here it refers to the four ‘wing-like’ lobes of the corolla, with adaxial and abaxial lips both having 2 lobes.,
Vernacular name: The Chinese name of this new species is 姑婆山马铃苣苔. The pronunciation of the Chinese of this species is ‘Gū Pó Shān Mǎ Líng Jù Tái’.
Distribution and ecology: Oreocharis tetrapterus is currently known only from one population of ca. 50 individuals at the type locality. The species may be endangered, but more data is needed to evaluate this reliably. The species grows on moist surfaces, on moss-covered granite rocks with other plants under subtropical bamboo and evergreen broad-leaved forest cover in Hezhou City, Guangxi.
Bo Pan, Guang-Da Tang, Truong Van Do, Stephen Maciejewski, Chong-Lang Deng and Fang Wen. 2019. Oreocharis tetrapterus (Gesneriaceae), A New Species from East Guangxi, China. PhytoKeys. 131: 83-89. DOI: 10.3897/phytokeys.131.35434
