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Thalictrum Pseudoichangense (Ranunculaceae), a New Species from Guizhou, China

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Thalictrum Pseudoichangense (Ranunculaceae), a New Species from Guizhou, China Thalictrum pseudoichangense (Ranunculaceae), a New Species from Guizhou, China Qiner Yang Laboratory of Systematic & Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, Xiangshan, Beijing 100093, People's Republic of China. [email protected] Guanghua Zhu Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A. [email protected] ABSTRACT. Thalictrum pseudoichangense Q. E. for the classi®cation of the genus Thalictrum (Wang Yang & G. Zhu, a new species of Ranunculaceae & Wang, 1979; Wang, 1980), it seems reasonable from Guizhou Province, China, is described and il- to describe the plant as a new species. lustrated. The new species is related to T. ichan- The gathering H. J. Esquirol s.n. has no record gense Lecoyer ex Oliver and T. coreanum H. LeÂv- of precise collection locality, date, or habitat. The eille by having peltate lea¯ets and stipitate record includes only ``Kweichow, collected by H. J. achenes, but differs in the styles being much lon- Esquirol.'' The sheet at Kew was presented to K in ger, ca. 3 mm long. January 1950 by the Hong Kong Herbarium of the Agriculture, Fisheries and Conservation Depart- Key words: China, Ranunculaceae, Thalictrum. ment of Hong Kong, with the accession number to the Hong Kong Herbarium being 252. We expect In the course of examining specimens of Ran- to ®nd more sheets of this gathering from the Hong unculaceae in the herbarium of the Royal Botanic Kong Herbarium. Gardens, Kew (K), a gathering of Thalictrum L. H. J. Esquirol was a French missionary collect- made in Guizhou, southwestern China, i.e., H. J. ing plants mainly in Guizhou Province from 1896 Esquirol s.n., caught the ®rst author's attention. to 1933, particularly in its southwestern part, such This gathering had been previously identi®ed as T. as Xingyi, Zhenfeng, Ceheng, and Wangmo Coun- fortunei S. Moore at Kew, a species occurring only ties (W. T. Wang, unpublished data). We suspect the in eastern China's Ahhui, Jiangsu, Jiangxi, and gathering H. J. Esquirol s.n. mentioned above might Zhejiang Provinces. At ®rst glance the specimen is be made from southwestern Guizhou, although we somewhat similar to T. fortunei in habit and leaf shape, but upon careful examination it is clearly a could not ®nd any other gatherings of the new spe- quite different species. The plant under question cies from this region after a comprehensive survey has slightly peltate leaves and conspicuously stip- of Thalictrum collections deposited in the major itate achenes, whereas T. fortunei has non-peltate Chinese herbaria. This is somewhat understandable leaves and sessile achenes. Having peltate leaves since Guizhou is a province of China not yet very and stipitate achenes, the plant is undoubtedly carefully botanized. close to T. ichangense, a species widely distributed Thalictrum includes 150 to 200 species in the in China and northern Vietnam, and also to T. co- world, mainly distributed in temperate regions (Fu reanum (sometimes treated as a variety of T. ichan- & Zhu, 2001; Tamura, 1995). In China 76 species gense, i.e., var. coreanum (H. LeÂveilleÂ) H. LeÂveille have been recorded, of which 49 are endemic ex Tamura), a species occurring in Korea, but dif- (Wang & Wang, 1979; Fu & Zhu, 2001). Most of fers by having styles much longer, ca. 3 mm long, the Chinese Thalictrum species are distributed in subulate in shape, and ventrally indistinctly stig- southwestern China, particularly in Yunnan and matic. In both T. ichangense and T. coreanum, the Sichuan. The genus is not richly represented in achenes have very short and inconspicuous styles Guizhou, where only nine species (including the ca. 0.3 mm long and ventrally distinctly stigmatic. new species described herein) have been known. As the length of styles and the degree of develop- Detailed ®eldwork is needed to gain a better knowl- ment of stigmatic tissue are important characters edge of the genus Thalictrum in this province. NOVON 14: 510±512. 2004. Volume 14, Number 4 Yang & Zhu 511 2004 Thalictrum pseudoichangense (Ranunculaceae) Figure 1. Thalictrum pseudoichangense Q. E. Yang & G. Zhu. ÐA. Basal leaf. ÐB. Flowering branch. ÐC. Achene. ÐD. Stamen. Drawn from the type, H. J. Esquirol s.n. (K). Considering our new species is very similar to tall, with a few distal branches. Basal leaves 2; pet- Thalictrum ichangense in general appearance, we iole 4±5 cm long; leaf blade 2- or 3-ternate, 6±12 name it T. pseudoichangense. 3 ca. 5 cm; lea¯ets slightly peltate, thinly herba- ceous, obovate, widely ovate or suborbicular, 0.8± Thalictrum pseudoichangense Q. E. Yang & G. 2 3 0.7±1.5 cm, apex slightly obtuse or rounded, Zhu, sp. nov. TYPE: China. Guizhou: precise base subrounded, trilobed; lobe margins toothed; locality (southwestern Guizhou?) and date un- nerves ¯at on both surfaces; petiolule 1.7±3 cm known, H. J. Esquirol s.n. (holotype, K). Figure long; cauline leaves ca. 3, similar to the basal ones 1. but smaller, ca. 4 3 1.5 cm. In¯orescence mono- chasial; pedicel slender, ca. 5 mm long. Flowers Haec species Thalictro ichangensi et T. coreano af®nis with sepals caducous; stamens ca. 6 mm long; an- foliolis peltatis et acheniis stipitatis, sed stylis multo lon- thers elliptic, ca. 0.5 mm long; ®laments clavate, gioribus, circiter 3 mm longis differt. gradually dilated upward, apex oblanceolate; car- Herbs perennial, glabrous; stems 2, 15±25 cm pels 5 to 6, long-stipitate; styles subequaling ova- 512 Novon ries, ca. 3 mm long, ventrally indistinctly stigmatic trum the long styles which are ventrally indistinctly in upper part. Achene body fusiform, ca. 3 mm stigmatic, such as those of T. javanicum Blume, T. long; veins ca. 8; stipe slender, ca. 2 mm long. faberi Ulbrich, T. robustum Maximowicz, and T. me- galostigma (Boivin) W. T. Wang, may represent a Thalictrum pseudoichangense, which is known primitive state, whereas the short styles ventrally thus far only from the type collection, is closely distinctly stigmatic, such as those of T. baicalense related to T. ichangense and T. coreanum in having Turczaninow, T. ichangense, and T. delavayi Fran- peltate lea¯ets and stipitate achenes, but differs by chet, may represent a relatively derived state. having styles much longer, ca. 3 mm long, subulate in shape, ventrally indistinctly stigmatic. In the lat- Acknowledgments. We are most grateful to Sue ter two species, the styles are very short and in- Zmarzty and Gillian Challen for their help during conspicuous, ca. 0.3 mm long, and ventrally dis- the ®rst author's visit to K in 2001, to Wang Wen- tinctly stigmatic. Based on their stipitate achenes, tsai and Xie Lei (PE) for valuable comments on the these three species are undoubtedly members in manuscript, and to Sun Ying-bao for the illustra- Thalictrum subg. Thalictrum sect. Tripterium DC. tion. This work was supported by the National Nat- ser. Clavata W. T. Wang & S. H. Wang (5 sect. ural Science Foundation of China (Grant No. Physocarpum DC.). This series is characterized 30070057) and a Key Project of the Chinese Acad- mainly by having leaves herbaceous, styles usually emy of Sciences (KSCXZ-SW-101A). very short, ventrally distinctly stigmatic, achenes stipitate, compressed, and unwinged (Wang & Literature Cited Wang, 1979). The series comprises ca. 27 species, Fu, D. Z. & G. Zhu. 2001. Thalictrum. Pp. 282±302 in mostly occurring in eastern Asia, 12 (including the Z. Y. Wu & P. H. Raven (editors), Flora of China, Vol. present new species) in China, of which 9 are en- 6. Science Press, Beijing, and Missouri Botanical Gar- den Press, St. Louis. demic to the country (Wang & Wang, 1979). It is Tamura, M. 1995. Thalictrum. Pp. 474±494 in P. Hiepko noteworthy that in the series Clavata, T. pseudo- (editor), Die natuÈrlichen P¯anzenfamilien (zweite Au¯a- ichangense is the only species whose carpels have ge), Band 17 a IV. Duncker & Humblot, Berlin. long styles which are ventrally indistinctly stigmat- Wang, W. T. 1980. Notulae de Ranunculaceis sinensibus (IV). Bull. Bot. Lab. N. E. Forest. Inst. 8: 15±37. ic, and thus might represent a primitive form (W. & S. H. Wang. 1979. Thalictrum. Pp. 502±592 in T. Wang, pers. comm.). Wang and Wang (1979) and Flora Reipublicae Popularis Sinicae, Vol. 27. Science Wang (1980) considered that in the genus Thalic- Press, Beijing..
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