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. 2020 Aug 26:157:121-135.
doi: 10.3897/phytokeys.157.50246. eCollection 2020.

Oreocharis jasminina (Gesneriaceae), a new species from mountain tops of Hainan Island, South China

Shao-Jun Ling  1   2 , Shu-Ping Guan  3 , Fang Wen  4 , Yu-Min Shui  5 , Ming-Xun Ren  1
Affiliations

Oreocharis jasminina (Gesneriaceae), a new species from mountain tops of Hainan Island, South China

Shao-Jun Ling et al. PhytoKeys. .

Abstract

A new species of Gesneriaceae, Oreocharis jasminina S.J.Ling, F.Wen & M.X. Ren from Hainan Island, south China, is highlighted and described. The new species is distinguished by its actinomorphic corolla, narrow floral tube and ovate anthers hidden in the floral tube. The new species also showed clear geographic and altitudinal isolation from the three currently-recognised Oreocharis species on the Island. Molecular phylogenetic analysis, based on nuclear ITS1/2 and plastid trnL-trnF sequences, supported the delimitation of the new species, which forms a single lineage with all the other Oreocharis species from Hainan Island. The roles of geographic and floral isolation in the evolution of the new species and its affinities are discussed.

Keywords: Oreocharis; Hainan Island; new taxon.

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Figures

Figure 1.
Figure 1.
Molecular phylogeny of Hainan Oreocharis taxa with outgroup O. sinohenryi, based on the combined nuclear ribosomal DNA (nrDNA) sequence ITS1/2 and chroloplast gene trnL-trnF data matrices. Posterior probability (PP) and Bootstrap value (BS) are showed above branches.
Figure 2.
Figure 2.
Oreocharis jasminina sp. nov. A Habitat B habit C face view of corolla D lateral view of corolla E opening flower showing stamens and staminode F stamens and staminode G pistil and sepals H fruit pods I adaxial leaf surface J abaxial leaf surface.
Figure 3.
Figure 3.
Oreocharis jasminina sp. nov. (all drawings based on the holotype S.J.Ling 20181126–01 in HUTB, drawn by S.P. Guan). A Habit B face view of corolla C lateral view of corolla D opening corolla showing pistil and stamens E pistil F stamens and staminode.
Figure 4.
Figure 4.
Three formerly-recognised Oreocharis taxa in Hainan Island. Oreocharis dasyantha (A, B), Oreocharis dasyantha var. ferruginosa (C, D) and Oreocharis flavida (E, F).
Figure 5.
Figure 5.
Geographic distribution of Oreocharis jasminina sp. nov. and the three congeners on Hainan Island. ★ O. jasminina sp. nov. ∆ O. dasyantha ◊ O. dasyantha var. ferruginosa □ O. flavida.
See this image and copyright information in PMC

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