Microsoft Word - 05. Hemiboea roseoalba OK 4.doc Bangladesh J. Plant Taxon. 20(2): 171-177, 2013 (December) © 2013 Bangladesh Association of Plant Taxonomists HEMIBOEA ROSEOALBA S.B. ZHOU, X. HONG & F. WEN (GESNERIACEAE), A NEW SPECIES FROM GUANGDONG, CHINA SHOU-BIAO ZHOU1, XIN HONG2, FANG WEN3,4 AND HONG-MEI XIAO College of Life Sciences, Anhui Normal University, CN-241000, Wuhu, China Keywords: Hemiboea roseoalba; New species; Gesneriaceae; Limestone cave flora; China. Abstract A new species of Hemiboea, H. roseoalba, from Guangdong, China, is described and illustrated. It is similar to H. gracilis and H. angustifolia in leaf and flower shape, but can be distinguished by leaf blade with serrulate from the middle to the apex, lateral veins 7-9 on each side of midrib; peduncle 2.5-3.0 cm long, glabrous; cymes 4-6-flowered; triangular calyx base connate for c. 0.3 cm; pink corolla 4.0-4.3 cm long and margin of lobes curled or retroflexed; staminodes 3; pistil 3.7-4.0 cm long; disc 2 mm high and truncate stigma slightly swollen. Introduction The genus Hemiboea Clarke in Hooker (1888) of the Gesneriaceae was first described by Clarke, with two sections: Sect. Subcapitatae Clarke and Sect. Sympodiales Clarke. Before 2011, a Chinese endemic genus, Metabriggsia W.T. Wang, was considered morphologically similar to Briggsia Craib especially in those species with stems, but differs by having only two fertile stamens and one sterile carpel so that it can be treaed as a single genus, when it was published by Wang (1983). Thus this prefix, “Meta-”, means “with”, “between” and “amid”, was used to describe the similarity in both genera. Actually, whether morphologies or molecular evidences show it is much closer to Hemiboea. Thus, Metabriggsia is reduced to synonymy with Hemiboea and its two species are transferred to that genus (Weber et al., 2011). So, now it has been revised 29 species and six varieties in China, northern Vietnam, Iriomote-Shima of Ryukyu, Japan (Li, 1996, 2004; Wen et al., 2011; Xu et al., 2012; Pan et al., 2012). China, the center of species diversity of the genus, has all species distributed from South China eastward to Taiwan and northward to Henan and Ganshu (Li, 1983, 1987), with 4 species recorded in Guangdong province before 2012 (Wei et al., 2010). During the course of a floristic investigation in 2012, we collected a rare unknown species of Hemiboea Sect. Subcapitatae from a limestone area in Liannan Yaozu Autonomous County, Guangdong. After consulting national floras and relevant literature (Li, 1987, 2004; Wang, 1990; Wei and Wen, 1995; Weitzman et al., 1997; Wang et al., 1998; Wei et al., 2010; Xu et al., 2010; Huang et al., 2011; Wen et al., 2011; Pan et al., 2012), as well as specimens of different herbaria (PE, IBK, IBSC, CDBI, HN, KUN, ANU, BJFU, VNM), we concluded that our specimens represent a new species, Hemiboea roseoalba sp. nov. which is described and illustrated here. 1The Key Laboratory of Conservation and Employment of Biological Resources of Anhui, CN-241000, Wuhu, China. 2The Gesneriad Conservation Center of China. 3Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and the Chinese Academy of Sciences, CN-541006 Guilin, China 4Corresponding author. Email: wenfang760608@139.com 172 ZHOU et al. Hemiboea roseoalba S.B. Zhou, Xin Hong, & F. Wen, sp. nov. (Figs 1, 2). Diagnosis: Haec species nova similis H. gracilis Franchet et H. angustifoliae F. Wen & Y.G. Wei, sed foliis margine serratus ab medius ad apex, lateralis nervis 7-9, pedunculis 2.5-3.0 cm longis, glabris, cymis 4-6-floris, calyx triangulatus, supra basin connatus ca. 0.3 cm, corolla persicinus, 4.0-4.3 cm longis, labellis margine crispus vel reflexis, staminodiis 3, pistillo 3.7-4.0 cm longo, stigmate truncates et leviter tumidus. Fig. 1. Hemiboea roseoalba sp. nov. (A) flowering branch; (B) dissection of a flower showing stamens and staminodes; (C) stamens; (D) calyx opened showing pistil and disc; (E) stigma (drawn from the holotype, F. Wen 201209031). HEMIBOEA ROSEOALBA, A NEW SPECIES FROM CHINA 173 Type: China, Guangdong Province: Liannan Yao Autonomous county, Gutian village, growing in the entrance of a limestone cave, ± 200 m, 20 Sep. 2012, F. Wen 201209031 (Holotype: IBK!; Isotype: ANU!). Perennial herbs. Stems ascending, 40-80 cm high, 5-7 mm in diameter, with scattered brown spots, glabrous to sparsely pilose toward apex, simple or branched, with 10-12 nodes or more. Leaves opposite, 8-10 crowded at the apex of stems, the lower ones commonly caducous; petiole Fig. 2. A-G: Hemiboea roseoalba sp. nov. (A) habitat; (B) plants growing in natural habitat; (C) flowering plants; (D) frontal view of flower; (E) involucre; (F) pistil and calyx; (G) corolla opened showing stamens and staminodes. 174 ZHOU et al. 2-4 cm long, glabrous; leaf blade sub-carnose or thinly leathery, thickly herbaceous when dry, narrowly lanceolate to elliptic-lanceolate, 10-12 × 4-5 cm, adaxially pubescent, abaxially glabrous, base narrowly cuneate, sometimes slightly oblique, upper surface deep green, lower surface pallid, margin serrulate from the middle to the apex, apex acute or acuminate, lateral veins 7-9 on each side of midrib. Cymes pseudoterminal, 4-6-flowered, peduncle 2.5-3.0 cm long, glabrous, densely covered in brown spots; involucre nearly spheroidal or cordate, apex long-mucronate, c. 2 cm long, 2.0-2.3 cm in diameter, vivid green, membranous, glabrous, bowl-shaped when opened. Pedicel 0.3-0.4 mm long, glabrous. Calyx 5, white or pale green, base connate for c. 0.3 cm, lobes equal, triangular, 1.0-1.2 × 0.5-0.7 cm, glabrous. Corolla pink outside, brownish yellow inside, with mauve lines and spots, 4.0-4.3 cm long, outside densely short glandular-hairy and puberulent, inside glabrous; tube 3.5-3.8 cm long, 1.7-2.0 cm in diameter at the orifice, 0.6-0.7 mm in diameter at the base, inside with a ring of hairs adnate to c. 0.4 cm above the corolla base; limb distinctly 2-lipped, adaxial lip 2-lobed to the base, lobes oblate, margin curled, 5.5-7.0 × 5.2-7.3 mm, retroflexed; abaxial lip 3-lobed towards the middle, lobe oblate or oblate-oval, margin repand, 6.7-8.0 × 6.4-7.5 mm, reflexed. Stamens 2, adnate to 10.5-11.2 mm above the corolla base; filaments linear, c. 15 mm long, geniculate near the base, linear, glabrous; anthers fused at extremities, slightly elliptic, glabrous, 3.2-3.5 × 2.0-2.5 mm. Staminodes 3, glabrous, adnate to 10.2-11.3 mm above the corolla base, middle one c. 5 mm long, linear, apex inflated, lateral ones linear, c. 7 mm long with adherent capitate apex. Disc ring-like, c. 2.2 mm high, margin repand, glabrous. Pistil 3.7-4.0 cm long; ovary linear, c. 1.1 cm long, 1.7-2.1 cm in diameter, glabrous; style 2.6-2.9 cm long; stigma slightly swollen, truncate, c. 1 mm in diameter. Capsule linear, 3.2- 3.5 cm long, glabrous, slightly curved. Phenology: Flowering from end of September to the middle of October. Fruits maturing during October to November. Etymology: The species is named after the pink colour of the corolla of this new taxon, which is brightly pink in this genus. Distribution: China, only known from the type locality, Gutian village, Liannan Yao Autonomous county, in northern Guangdong Province of southeastern China (Fig. 3). Fig. 3. Distribution map of Hemiboea roseoalba sp. nov. and its related taxa. (A) Known distribution of H. angustifolia; (B) Known distribution of H. roseoalba; (C) Oval area, distribution of H. gracilis. HEMIBOEA ROSEOALBA, A NEW SPECIES FROM CHINA 175 Habitat: Hemiboea roseoalba grows in rocky crevices on moist shady cliffs at the entrance of a limestone cave, at an elevation of about 200 m above sea level. It occurs in subtropical evergreen broad-leaved forest. Fig. 4 A-E. Hemiboea gracilis (A) Habitat; (B) Front view of flower; (C) Lateral view of flower; (D) Top view of flower and leaf blade; (E) Involucre. F-I. Hemiboea angustifolia (F) Habitat; (G) Front and lateral view of flowers; (H) Top view of flowers; (I) Involucre. Additional collections (paratypes): China, Guangdong province: Liannan Yao Autonomous county, Gutian village, c. 200 m, 20 September 2008, Xin Hong 20110903 (ANU!). 176 ZHOU et al. Hemiboea roseoalba is morphologically close to H. gracilis Franchet and H. angustifolia F. Wen & Y.G. Wei in the shape of leaf and flower, but can be easily distinguished by the leaf blade, lateral veins, peduncle, corolla, staminodes, pistil, disc and stigma characters (Table 1, Fig. 4). Table 1. Morphological comparison of Hemiboea roseoalba, H. gracilis and H. angustifolia. Characters H. roseoalba H. gracilis H. angustifolia Margin of leaf blade Serrulate from the middle to the apex Entire to repand Entire Peduncle 2.5-3.0 cm long, glabrous 0.2-1.2 cm long, glabrous to sparsely white pilose 1.0-1.5 cm long, glabrous Corolla size 4.0-4.3 cm long 3.0-3.8 cm long 4.8-5.4 cm long Staminodes 3 2 2 Pistil 3.7-4.0 cm long 2.0-2.5 cm long 2.5-2.7 cm long Disc c. 2.0 mm long c. 1.0 mm long c. 2.2 mm long Stigma Slightly swollen, truncate Capitate Capitate, slightly depressed in the middle Flowering time September - October August - October November Acknowledgements The authors are grateful to Prof. Xin-Hu Guo for checking the specimens and reviewing the description of this new species. The authors also like to thank Miss Xu Xiao-Ming for drawing the botanical illustration. This study was supported by Key Foundation of Education Department of Anhui Province (KJ2011A129), Provincial Key Laboratory of Biotic Environment and Ecological Safety in Anhui (2004sys003), Science Research Foundation of Guangxi Institute of Botany (Guizhiye11003), the Guangxi Natural Science Foundation (2011GXNSFB018050), Guangxi Key Laboratory of Functional Phytochemicals Research and Utilization (ZRJJ2012-9) and West Light Foundation of the Chinese Academy of Sciences. References Clarke, C.B. 1888. Hooker's Icones Plantarum; or figures, with brief descriptive characters and remarks of new or rare plants, 18, sub t. 1798. Huang, Y.S., Xu, W.B., Peng, R.C. and Liu, Y. 2011. A new variety of Hemiboea (Gesneriaceae) from limestone areas in Guangxi, China. Taiwania 56(3): 240-243. Li, Z.Y. 1983. Taxa Nova Hemiboeae (Gesneriaceae). Acta Phytotax. Sin. 21(2): 194-203. Li, Z.Y. 1987. A study of the genus Hemiboea (Gesneriaceae). Acta Phytotax. Sin. 25(2): 81-92. Li, Z.Y. 1996. The geographical distribution on the subfamily Cyrtandroideae Endl. emend. Burtt (Gesneriaceae). Acta Phytotax. Sin. 34(4): 341-360. Li, Z.Y. 2004. Metabriggsia and Hemiboea. In: Li, Z.Y. and Wang, Y.Z. (Eds), Plants of Gesneriaceae in China. Henan Science and Technology Publishing House, Zhengzhou, pp. 122-153. Pan, B., Wu, W.H. and Xu, W.B. 2012. Hemiboea pseudomagnibracteata (Gesneriaceae), a new species from Guangxi, China. Taiwania 57(2): 188-192. Wang, W.T. 1983. Genus Novum Gesneriacearum E Guangxi. Guihaia 3(1): 1-6. Wang, W.T. 1990. Gesneriaceae. In: Wang, W.T. (Ed.), Flora Reipublicae Popularis Sinicae 69. Science Press, Beijing, pp. 125-581. HEMIBOEA ROSEOALBA, A NEW SPECIES FROM CHINA 177 Wang, W.T., Pan, K.Y., Li, Z.Y., Weitzman, A.L. and Skog, L.E. 1998. Gesneriaceae. In: Wu, Z.H. and Raven, P.H. (Eds), Flora of China, Vol. 18. Science Press, Beijing; Missouri Botanical Garden Press, Saint Louis. Weber, A., Wei, Y.G., Sontag, S. and Möller, M. 2011. Inclusion of Metabriggsia into Hemiboea (Gesneriaceae). Phytotaxa 23: 37-48. Wei, Y.G. and Wen H.Q. 1995. Two new species from Guangxi. Guihaia 15: 216–219. Wei, Y.G., Wen, F., Möller, M., Monro, A. and Cui, C. 2010. Metabriggsia and Hemiboea. In: Wei, Y.G., Wen, F., Möller, M., Monro, A., Zhang, Q., Gao, Q., Mou, H.F., Zhong, S.H. and Cui, C. (Eds), Gesneriaceae of south China. Guangxi Science and Technology Publishing House, Nanning, pp. 174-216. Weitzman, A.L., Skog, L.E., Wang, W.T., Pan, K.Y. and Li, Z.Y. 1997. New taxa, new combination, and notes on Chinese Gesneriaceae. Novon 7: 423-435. Wen, F., Tang, W.X. and Wei, Y.G. 2011. Hemiboea angustifolia (Gesneriaceae), a new species endemic to a tropical limestone area of Guangxi, China. Phytotaxa 30: 53-59. Xu, W.B., Wu, W.H., Nong, D.X. and Liu, Y. 2010. Hemiboea purpurea sp. nov. (Gesneriaceae) from a limestone area in Guangxi, China. Nordic J. Bot. 28(3): 313-315. Xu, W.B., Huang, Y.S., Peng R.C. and Zhuang X.Y. 2012. Hemiboea sinovietnamica sp. nov. (Gesneriaceae) from a limestone area along the boundary of Sino-Vietnam. Nordic J. Bot. 30(6): 691-695. (Manuscript received on 24 February 2013; revised on 29 August 2013)