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Oreocharis panzhouensis (Gesneriaceae), a new species from karst regions in , China

Article in Phytotaxa · February 2019 DOI: 10.11646/phytotaxa.393.3.5

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https://doi.org/10.11646/phytotaxa.393.3.5

Oreocharis panzhouensis (Gesneriaceae), a new species from karst regions in Guizhou, China

LEI CAI1, 5, 6#, YING GUO3#, RONG-MEI ZHANG4, ZHI-LING DAO1,6* & FANG WEN2* 1 Key Laboratory for Integrative Conservation of Plant Species with Extremely Small Populations, Institute of Botany, Chinese Academy of Sciences, Kunming CN-650201, Yunnan, China 2 Gesneriad Conservation Centre of China, Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Botanical Garden, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin CN-541006, Guangxi, China 3 Liupanshui Niangniangshan National Wetland Park Administration Office, Panhzou CN-553522, Guizhou, China 4 Kunming Institute of Landscape, Kunming 650224, Yunnan, China 5University of Chinese Academy of Sciences, CN-100049 , China 6 Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming CN-650201, Yunnan, China # The authors contributed equally to this work. *Author for corresponding: E-mail: [email protected]; [email protected]

Abstract

A new species of Gesneriaceae, Oreocharis panzhouensis, is described and illustrated from City, Guizhou Province, China. The new species is morphologically similar to O. cavaleriei and O. forrestii in corolla shape and color, number of stigmas and stamens, but it can be easily distinguished by the shape of leaf blade and calyx, leaf blade indumentum, filament and pistil indumentum and length, and peduncle length.

Introduction

After Oreocharis Bentham (1876: 1021) was redefined by Möller et al. (Chen et al. 2014, Möller et al. 2011, 2014), including some new taxa described in recent years (e.g. Cai et al. 2015, 2017, Möller 2015, Wei et al. 2016, Chen et al. 2017, 2018, Do et al. 2017, Han et al. 2017), Oreocharis s.l. now consists of more than 115 species mainly distributed in southern and southwestern China (Wang et al. 1990, 1998, Li & Wang 2004, Xu et al. 2017). Oreocharis is nearly endemic to China with ca. 110 species and 13 varieties, there is an endemic species in Japan and other in Thailand, two each in India and Bhutan, three in Myanmar and seven in Vietnam (Chen 2016, Chen et al. 2017, 2018, Xu et al. 2017). In 2015, during field investigations of the karst region in West of Guizhou, an unknown species of Gesneriaceae was collected in Panzhou City. In July 2017, we observed one population in nature and confirmed that it is a member of Oreocharis according to the flowering characteristics. After carefully examination of the relevant specimens and literature of the genus, we concluded that this plant represents a species new to science, which is described and illustrated below, and its morphological characters are compared with the closely similar species O. cavaleriei Léveillé (1909: 258) and O. forrestii (Diels 1912: 224) Skan (1917: tab. 8719) (Fig 3).

Taxonomy treatment

Oreocharis panzhouensis Lei Cai, Y.Guo & F.Wen, sp. nov. (Figs. 1 & 2) Diagnosis:—Oreocharis panzhouensis resembles O. cavaleriei and O. forrestii in floral characteristics, including stigma shape, but can be easily distinguished from them by having ovate to suborbicular leaf blades, adaxially densely appressed pubescent, abaxially pubescent, densely rusty-brown villous along veins and margin, 4.5–8 cm long peduncle, 5-lobed calyx, with the lobes half calyx length, undulate disc margin, and glabrous filaments and pistil.

Accepted by Jesús González-Gallegos: 23 Dec. 2018; published: 22 Feb. 2019 287 Type:—CHINA. Guizhou: Panzhou City, Hongguo community, Zhongsha village, Laoheishan, 25°39’ N, 104°20’ E, 1920 m, on moist rocks, in flowering, 22 August 2015, Ying Guo C2015005 (holotype KUN!, isotypes KUN!, IBK!).

FIGURE 1. Oreocharis panzhouensis Lei Cai, Y.Guo & F.Wen.—A. Plant with flowers & young fruits.—B. Opened corolla showing stamens.—C. Flower with calyx.—D. Pistil and calyx.—E. Pistil with disc.

Perennial herbs, rhizomatous, 5–8 mm long. Leaves basal; petiole 1.5–4 cm long, brown villous; leaf blade ovate to suborbicular, 1.5–4.5 × 1–3 cm, adaxially densely appressed pubescent, abaxially pubescent, densely rusty- brown villous along veins and margin, lateral veins 3–5 on each midrib side, apex rounded, base slightly oblique sometimes, rounded to cordate, margin crenate. Cymes axillary 1–4, inflorescence 1–8-flowered; peduncle 4.5–8 cm long, brown villous; bracts 2, linear to subulate, ca. 3.5 × 1.0 mm, brown villous outside, margin entire; pedicel 0.8–2.2 cm long, brown villous. Calyx campanulate, 0.6–0.8 cm long, 5-lobed to the middle, lobes equal, broadly triangular, ca. 3.5 mm long, outside pubescent and sparsely brown villous, glabrous inside. Corolla yellow, 2–2.4 cm long, pubescent and glandular-pubescent outside , glandular-pubescent inside in the throat and adaxial lobes, tube campanulate, 1.4–1.8 cm long, ca. 5 mm in diameter; limb 2-lipped; adaxial lip 2-lobed from near base, semiorbicular, lobes 1–2 × 1–2 mm, abaxial lip 3-lobed to base, semiorbicular to elliptic, 4–6 × 3–5 mm. Stamens 4, 5–10 mm long, adnate to corolla 5–6 mm from base; filaments flattened, glabrous; anthers broadly oblong, 2-loculed, dehiscing longitudinally, connective glabrous; staminode apparently absent. Disc ca. 1.5 mm high, margin undulate. Pistil glabrous, 0.8–1.4 cm long; ovary cylindrical, 5–8 mm long; style 2–4 mm long; stigma 2, flabellate. Capsule linear, 2.4–3.6 cm long.

288 • Phytotaxa 393 (3) © 2019 Magnolia Press WEN ET AL. FIGURE 2. Oreocharis panzhouensis Lei Cai, Y.Guo & F.Wen.—A & B. Habitat.—C. Flowers and leaves.—D. Inflorescence.—E. Flowers front view of.—F. Flowers side view and young fruits.—G. Dry flower with calyx.—H. Opened corolla showing stamens.—I. Pistil. Scale bars: A, B= 5 cm; C, D, E, F = 2 cm; G, H, I = 1 cm.

FIGURE 3. Oreocharis forrestii (Diels) Skan—A. Habitat.—B. Plants with flowers and fruits.—C. Adaxial leaf surface.—D. Abaxial leaf surface.—E. Inflorescence.—F. Flowers side view.—G. Opened corolla showing stamens and staminode.—H. Pistil with disc and calyx.—I. Opened corolla with pistil and calyx. Scale bars: A, B= 5 cm; C, D, E = 2 cm; F, G, I = 1 cm; H = 5 mm.

A NEW SPECIES OF OREOCHARIS PANZHOUENSIS Phytotaxa 393 (3) © 2019 Magnolia Press • 289 Distribution and Ecology:—Oreocharis panzhouensis is currently known only from the type locality in karst region by one population with ca. 150 individuals. This species was observed growing on moist rocks with other plants under evergreen broad-leaved forests, in an elevation of ca. 1920 m, in Hongguo community, Panzhou County, Guizhou, China. Phenology:—Flowering from August to September; fruiting from September to November. Etymology:—The specific epithet ‘panzhouensis’ refers to the type locality where the new species was found, Panzhou City, Guizhou Province. The Chinese name is “Pán Zhōu Mǎ Líng Jǜ Tái” (盘州马铃苣苔). Taxonomic affinities:—Oreocharis panzhouensis morphologically resembles O. cavaleriei and O. forrestii in having corolla yellow and not constricted throat, campanulate tube, broadly oblong and 2-loculed anthers, longitudinally dehiscent, and 2 stigmas. However, O. panzhouensis can be easily differentiated from them by the indumentum characters and leaf blade shape, the filament and pistil indumentum and length, calyx shape, and peduncle length. The detailed characters of the related species are provided in Table 1.

TABLE 1. Comparison of morphological characters of Oreocharis panzhouensis, O. cavaleriei and O. forrestii.

Characters O. panzhouensis O. cavaleriei O. forrestii

Leaf blade shape ovate to suborbicular broadly ovate to suborbicular oblanceolate to narrowly ovate

pale brown pubescent, adaxially sparsely rust-brown adaxially densely appressed pubescent, abaxially more densely so, villous and white pubescent, Leaf indumentum abaxially pubescent, densely rusty- sometimes with darker hairs abaxially densely rust-brown brown villous along veins and margin along veins villous and white pubescent Peduncle length (cm) 4.5–8 10–15(–22) 4–14 Bract shape linear to subulate lanceolate linear to linear-lanceolate 5-lobed to near base, linear- 5-lobed to base, lanceolate to Calyx lobes 5-lobed to the middle, broadly triangular lanceolate narrowly lanceolate pubescent outside and glandular- glandular puberulent outside, Corolla indumentum pubescent, glandular-pubescent inside, glabrous glabrous inside pubescent in the throat and adaxial lobes Filament indumentum glabrous sparsely pubescent glabrous Disc shape margin undulate margin entire margin entire Pistil indumentum glabrous brown pubescent glabrous

Acknowledgements

We thank Qiang Deng for his help. This study was financially supported by the Science & Technology Basic Resources Investigation Program of China (grant no. 2017FY100100), Guangxi Natural Science Foundation Program (2015GXNSFBB139004), the Fund of Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain (No.17-259-23), the Key Research and Development Project of Guangxi (Guike AB16380053) and Science Research Foundation of Guangxi Academy of Sciences (no. 2017YJJ23022).

References

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