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Clematis liuzhouensis (Ranunculaceae)

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Clematis liuzhouensis (Ranunculaceae), a New Species from ChinaChun-rui Lin and Yi-Gang WeiBotanical Institute of Guangxi, Chinese Academy of Sciences, Guilin 541006,People’s Republic of China. [email protected]; author for correspondence:[email protected] . A new species of Clematis L. (Ranuncu-laceae), C. liuzhouensis Y. G. Wei & C. R. Lin, isdescribed and illustrated. The new species is relatedto C. wissmanniana Handel-Mazzetti, but differs in itsleaflets that always have entire margins and areabaxially silvery-pannose and in its smaller sepalsthat are up to 1.53 0.6 cm.Key words: China, Clematis, IUCN Red List,Ranunculaceae.There are more than 300 species of Clematis L.(Ranunculaceae) in the world, and more than 100species are found in China (Chang et al., 1980).During a field trip to Liuzhou shi, Guangxi Province,China, in 1989, we collected an unusual Clematisspecimen with fruits only; however, we could notidentify it without flowers. In 2006, we returned toLiuzhou shi to collect the flowers, and now establish itas a new species.Clematis liuzhouensis Y. G. Wei & C. R. Lin, sp.nov. TYPE: China. Guangxi: Longtan Park,Liuzhou shi, 17 June 2006 (fl.), Y. G. Wei06220 (holotype, IBK; isotype, PE). Figure 1.Species nova affinis Clematidi wissmannianae Handel-Mazzetti, a qua foliolis margine integris subtus argenteo-pannosis atque sepalis minoribus 1.1–1.5 cm longis et 0.4–0.6 cm latis differt.Woody vines, 2–4 m long, branches angular,appressed puberulous. Leaves 2-pinnate or 2- to 3-ternate; leaflets papery, ovate-lanceolate, long-ovate,or ovate, 2.5–63 1.3–2.5 cm, apex acuminate, baserounded, margin always entire, adaxially appressedpuberulous, abaxially densely silvery pannose. Cymesaxillary, 4- to 7-flowered; peduncles 4–6.5 cm,puberulous; bracts lanceolate, ca. 63 2 mm. Flowers2.8–3.2 cm diam., pedicels 1.5–3.5 cm, puberulous;sepals 4, spreading, white, oblong, 1.1–1.53 0.4–0.6 cm, densely puberulous externally, glabrousinternally; stamens 50 to 87, glabrous, ca. 1.5 cm,filaments linear, anthers oblong, ca. 2 mm, apexobtuse. Achenes bilaterally compressed, ovate, ca. 53 2.5 mm, puberulous, persistent styles ca. 3 cm,plumose.Distribution. Clematis liuzhouensis is known onlyfrom the type locality in Liuzhou shi, in GuangxiProvince, China. It grows in association withBauhinia championii (Bentham) Bentham, Diospyrossaxatilis S. K. Lee, Mallotus microcarpus Pax & K.Hoffmann, and M. philippinensis (Lamarck) Mu¨llerArgoviensis.IUCN Red List category. Clematis liuzhouensisshould be considered Critically Endangered (CRA2c) according to IUCN Red List criteria (IUCN,2001). Only 10 individuals were found on thelimestone hills in an area of ca. 103 10 m2,atanelevation of 150 m. Although no path exists to thesite, the area is accessible to tourists, and tourismpresents the principal threat of disturbance to thenew species.Phenology. The new species was collected inflower in June and in fruit in August.Discussion. Based on floral structure, Clematisliuzhouensis belongs to section Clematis subsect.Clematis, characterized by its habit of woody vinesor herbs; leaves that are 2-pinnate, 2-pinnate deepsplit, or 2- to 3-ternate; inflorescences in cymes orpanicles; glabrous stamens; and lack of staminodes.The new species is characterized by its leaflets, whichare covered abaxially with a beautiful and unusualsilvery pannose indumentum, and this feature distin-guishes C. liuzhouensis from its close ally, C.wissmanniana Handel-Mazzetti, as well as otherspecies of that subsection. Clematis wissmanniana isfound only in the adjacent Yunnan Province to thewest of Guangxi, and is not sympatric with C.liuzhouensis.Paratype. CHINA. Guangxi: Longtan Park, Liuzhoushi, 28 Aug. 1989 (fr.), Longtan-Dule Expedition 00744(IBK).KEY TO CLEMATIS LIUZHOUENSIS AND C. WISSMANNIANA IN SOUTHCENTRAL CHINA1a. Leaflets always with entire margins, abaxiallysilvery pannose; sepals to 1.53 0.6cm....................................C.liuzhouensisNOVON 19: 194–196. PUBLISHED ON 18 JUNE 2009. doi: 10.3417/2007089Figure 1. Clematis liuzhouensis Y. G. Wei & C. R. Lin. —A. Fertile habit showing the flowering cymes. —B. Older stem. —C.Sepal, abaxial surface. —D. Stamen. —E. Infructescence. —F. Achene. A–D drawn by S. Q. He from the holotype, Y. G. Wei06220 (IBK); E, F, from the paratype, Longtan-Dule Exp. 00744 (IBK).Volume 19, Number 2 Lin & Wei 1952009 Clematis liuzhouensis (Ranunculaceae)1b. Leaflets sometimes with entire margins or serrate,appressed pubescent on both surfaces; sepals to 23 1cm.....................C. wissmannianaAcknowledgments. We are grateful to Wang Wen-tsai (CAS) for correcting the description and to He Sun-qing for the illustration of the new species. This study wassupported by the Knowledge Innovation Program of CAS.Literature CitedChang, M. C., C. T. Ting & P. L. Ling. 1980. Clematis L. Pp.75–235 in W. T. Wang (editor), Flora ReipublicaePopularis Sinicae, Vol. 28. Science Press, Beijing.IUCN. 2001. IUCN Red List Categories and Criteria, Version3.1. Prepared by the IUCN Species Survival Commission.IUCN, Gland, Switzerland, and Cambridge, UnitedKingdom.196

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