Research Article |
Corresponding author: Zhi-Ling Dao ( daozhl@mail.kib.ac.cn ) Academic editor: Wen-Hong Chen
© 2020 Lei Cai, Fang-Pu Liu, Xiang-Bo Yi, Zhi-Ling Dao.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Cai L, Liu F-P, Yi X-B, Dao Z-L (2020) Oreocharis wumengensis, a new species of Gesneriaceae from northeastern Yunnan, China. In: Shui Y-M, Chen W-H, Ren M-X, Wen F, Hong X, Qiu Z-J, Wei Y-G, Kang M (Eds) Taxonomy of Gesneriaceae in China and Vietnam. PhytoKeys 157: 113-119. https://doi.org/10.3897/phytokeys.157.33071
|
A new species of Gesneriaceae, Oreocharis wumengensis Lei Cai & Z.L.Dao from Wumeng Mountain area, Yanjin County, Yunnan Province, China, is described. The new species is morphologically similar to O. panzhouensis Lei Cai, Y.Guo & F.Wen in the shape of corolla, number of stigma and stamens, but it can be easily distinguished from this species by the leaf shape and indumentum characters of leaf blade, calyx and stamens. Detailed descriptions with photographs of the plant and holotype, and comparisons with morphologically similar species, are also provided.
flora of Yunnan, morphology, new taxon, Oreocharis, Wumeng Mountain
Many genera and species in the family Gesneriaceae have been redefined in the past two decades based on new evidence following the development of molecular phylogenetics (
In April 2017, during field investigations in the Wumeng Mountain area (Yanjin County, northeastern Yunnan), an unknown species of Gesneriaceae without flowers was collected and then planted in Kunming Botanical Garden (KBG). In July 2018, we firstly observed flowering plants which were cultivated in KBG, also based on the floral characteristics; we confirmed that it is a member of Oreocharis s.l. Following a careful review of the relevant herbarium specimens and taxonomic publications of Oreocharis from Yunnan and the adjacent regions, we concluded that this species is new to science. Oreocharis wumengensis Lei Cai & Z.L.Dao is described for the first time below, and its morphological characters are compared with those of closely related species.
Samples of the new species were collected from living plants cultivated in KBG, originally introduced from Yanjin County, Yunnan. All available specimens of Oreocharis s.l. are stored in the herbaria (HITBC, IBK, KUN and PE) and Chinese Virtual Herbarium (http://www.cvh.ac.cn/) in China and Global Plants on JSTOR (https://plants.jstor.org/) were examined. We studied all morphological characters with dissecting microscopes, and described the morphological characters by using the terminology presented by
Oreocharis wumengensis resembles O. panzhouensis in its floral characteristics, but can easily be distinguished from this species in the brown-pubescent, oblate petiole; the oblong, long elliptic to oblanceolate leaf blade; the glandular pubescent pedicel; the calyx 5-lobed to the base; and the apically coherent anthers.
Oreocharis wumengensis Lei Cai & Z.L.Dao, sp. nov. A Plant in the wild B, C plants in cultivation in KBG D adaxial and abaxial leaf surfaces E inflorescence F, G side and top view of flowers H front view of flower I opened corolla with pistil and calyx J pistil with disc and calyx K opened corolla showing stamens and staminode L adnate anthers, abaxial view M adnate anthers, adaxial view. Photographed by Lei Cai.
China. Yunnan: Yanjin County, Miaoba Town, Liuchang Village, Houshanping, 27°52'N, 104°20'E, elev. ca. 1050 m, on moist rocks (cultivated in KBG), in flowering, 3 August 2018, Lei Cai CL198 (holotype: KUN!, isotype: KUN!).
Perennial herb, rhizome 4–12 mm long, 3–5 mm in diameter. Leaves 8–20, basal, petiole oblate, 0.8–5.5 cm long, brown pubescent, leaf blade oblong, long elliptic to oblanceolate, 3.0–8.5 × 0.8–2.8 cm, adaxially densely appressed pubescent, abaxially pubescent, densely brown pubescent along veins, lateral veins 3–5 on each side of midrib, adaxially inconspicuous, adaxially conspicuous, apex acute, base cuneate, margin serrated, upper half obvious. Cymes axillary 2–4, inflorescence 4–10-flowered; peduncle 6.5–12 cm long, brown pubescent; bracts 2, lanceolate to elliptic, 5–7 × 1.5–3 mm, both sides appressed pubescent, margin nearly entire to denticulate; pedicel 1.5–4.5 cm long, glandular pubescent. Calyx 4–6 mm long, 5-lobed to the base, lobes unequal, linear or narrowly triangular, 4–6 mm long, ca. 1.5 mm wide, outside brown pubescent and glandular pubescent, inside glabrous. Corolla sigmoid, yellow, 2.2–2.6 cm long, outside extremely sparsely brown pubescent and densely glandular pubescent, inside glandular pubescent in the throat and on adaxial lobes, slightly contracted at the throat, 1.2–1.4 cm long, 4–7 mm in diameter; limb 2-lipped; adaxial lip 2-lobed to near base, semiorbicular, lobes 2–3 × 2–3 mm, abaxial lip 3-lobed to base, semiorbicular to oval, 6–8 × 5–7 mm. Stamens 4, 5–8 mm long, adnate to corolla 4–6 mm from base; filaments linear, glandular pubescent; anthers horseshoe shaped, coherent apically, 2-loculed, dehiscing longitudinally, connective glabrous; staminode 1, ca. 0.5 mm long, inserted ca. 1 mm from base. Disc ca. 1.5 mm high, yellow, margin undulate. Pistil 0.8–1 cm long; ovary long cylindrical, glabrous, 4–6 mm long; style 2–3 mm long, glandular pubescent; stigma bilobed, flabellate. Old Capsule linear, ca. 2 cm long.
Flowering from July to August; fruiting unknown.
The specific epithet ‘wumengensis’ referring to the type locality where the new species was found, is located in the famous Wumeng Mountain area.
The Chinese name for the new species is “Wū Méng Mǎ Líng Jù Tái” (乌蒙马铃苣苔).
Oreocharis wumengensis is currently known only from one population of ca. 50 individuals at the type locality. The species could be endangered, but more data is needed to evaluate this reliably. The species was observed growing on moist rocks with other plants under forest cover in karst regions in Yanjin County, Yunnan.
Oreocharis wumengensis is morphologically unique with sigmoid corolla within Oreocharis s.l., however there are certain similarities with other species in this genus. O. wumengensis is similar to O. panzhouensis in the shape of corolla, however, it is obviously different from the latter species. The comparison of morphologically characters on related species are provided in Table
Morphological comparison between Oreocharis wumengensis and O. panzhouensis.
Characters | O. wumengensis | O. panzhouensis |
---|---|---|
Petiole | oblate, brown pubescent | round, brown villous |
Leaf blade | oblong, long elliptic to oblanceolate | ovate to suborbicular |
Peduncle | brown pubescent | brown villous |
Bract | lanceolate to elliptic | linear to subulate |
Pedicel | glandular pubescent | brown villous |
Calyx | 5-lobed to the base, lobes linear or narrowly triangular | 5-lobed to the middle, lobes broadly triangular |
Corolla | sigmoid, yellow, slightly contracted at the throat, outside sparsely brown pubescent and densely glandular pubescent | pale yellow, tube campanulate, outside pubescent and glandular-pubescent |
Filament | linear, glandular pubescent | flattened, glabrous |
Anthers | horseshoe shaped, coherent apically | broadly oblong, separated |
Style | glandular pubescent | glabrous |
We thank Dr. Zhi-Kun Wu from the Guiyang University of Traditional Chinese Medicine and Ms. Li Zhong from Kunming Institute of Botany, Chinese Academy of Sciences for their assistance with the field work, and Ji-Dong Ya for his careful cultivation and management. This study was financially jointly supported by the Science & Technology Basic Resources Investigation Program of China (grant no. 2017FY100100), Yunnan Science and Technology Innovation Team Program for PSESP (Plant Species with Extremely Small Populations) Conservation and Utilization (Grant No. 2019HC015) and the Investigation of Camellia Resources in Yanjin County (2016–2018).