Legume additions to the flora of China Author Jiang, Kai-Wen 0000-0002-5917-1846 Key Laboratory of Biodiversity Conservation in Southwest China, National Forestry and Grassland Administration, Southwest Forestry University, Kunming, Yunnan 650224, China & Ningbo Botanical Garden, Ningbo, Zhejiang 315201, China & kevinchiangensis @ gmail. com; https: // orcid. org / 0000 - 0002 - 5917 - 1846 kevinchiangensis@gmail.com Author Tian, Bin 0000-0003-2325-724X Key Laboratory of Biodiversity Conservation in Southwest China, National Forestry and Grassland Administration, Southwest Forestry University, Kunming, Yunnan 650224, China & tianbin @ swfu. edu. cn; https: // orcid. org / 0000 - 0003 - 2325 - 724 X tianbin@swfu.edu.cn Author Pan, Bo 0000-0002-0038-9664 Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan 666303, China & Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Mengla, Yunnan 666303, China & University of Chinese Academy of Sciences, Beijing, 100049, China & pb @ xtbg. org. cn; https: // orcid. org / 0000 - 0002 - 0038 - 9664 pb@xtbg.org.cn text Phytotaxa 2022 2022-01-25 532 1 1 21 journal article 2438 10.11646/phytotaxa.532.1.1 29eea189-3044-4057-89dc-827632b79068 1179-3163 5900839 . Desmodium uncinatum (Jacq.) De Candolle (1825: 331) . Hedysarum uncinatum Jacquin (1798: 27) . Meibomia uncinata (Jacq.) Kuntze (1891: 197) . Type:— VENEZUELA . “crescit Caracas” ( lectotype W, isolectotypes W). Fig. 1. Description: —Subshrubs, prostrate to ± scandent, branched. Stem slender, striate, densely covered with hooked hairs ca. 1 mm . Stipules brown, ca. 5 mm , longitudinally striate, ciliate at margin, caducous; leaves trifoliolate; petioles 2–5.5 cm , cylindrical, grooved above, densely hairy as stem; rachis 0.5–1.5 cm ; leaflets lanceolate, apex acute, mucronate, base broadly cuneate to rounded, adaxial surface deep green, with a silvery plaque along the midvein, sparsely covered with appressed hairs, abaxial surface light green, hairy as the adaxial surface but much denser, terminal leaflet 3.5–9 × 1.3–4 cm , lateral ones slightly shorter, oblique; stipels 2–4 mm , linear-lanceolate, ciliate at margin; petiolules 1–3 mm , more densely hairy than stem. Inflorescence a pseudoraceme, axillary or terminal, with terminal ones ( 20–26 cm ) much longer than axillary ones ( 7–12 cm ), with a long peduncle, both peduncle and rachis hairy as stem; with two flowers per node; bracts ovate, ca. 5 mm , acute at apex, sparsely pubescent outside, marked with stripes as stipules, caducous. Pedicels 3–9 mm , hairy as peduncle. Calyx bilabiate, ca. 3 mm , with tube campanulate, sparsely covered with spreading hairs. Corolla pink, all petals short clawed; standard ca. 10 mm , obovate, retuse at apex, with two light green nectar guides at base; wing petals ca. 8 mm , narrowly obovate to oblong, obtuse at apex; keel petals ca. 5 mm , falcate to narrowly obovate, obtuse at apex. Stamens monadelphous, ca. 10 mm , vexillary stamen partially fused with the staminal tube. Loments ca. 4 cm , densely covered with white hairs, mature fruits and seeds not seen. Distribution and habitat: — Desmodium uncinatum is native to North, Central and South America, but it has been widely introduced to Australia and Southeast Asia ( Ohashi 1973 , Lima et al. 2014 ). It was introduced and cultivated as a tropical pasture in Guangdong, Guangxi, Hainan, Taiwan , and Yunnan in China multiple times ( Huang et al. 1991 ) but was never formally recorded as a naturalized species in Chinese floras ( Huang & Ohashi 1993 , 2010, Yang & Huang 1995 ). This species has successfully naturalized in Yunnan Province . It grows on roadside slopes at an elevation of 1376 m . Phenology: —Flowering from October to December; fruiting in December. Chinese name: —The Chinese name of Desmodium uncinatum is ffi叶山ặḑ , in which “ ffi叶 ” means “silver leaves”, which refers to the silvery plaque along the midvein on the adaxial surface of leaflets; “ 山ặḑ ” is the Chinese common name for Desmodium Desvaux (1813: 122) s. str. (see http://duocet.ibiodiversity.net/). Specimens examined:— CHINA . Guangdong : Guangzhou, Genetic Laboratory test field of South China Botanical Garden, “introduced from Australia”, 15 th Dec. 1980 , S . Q. Chen 18686 (IBSC). Guangzhou, South China Botanical Garden, 23 rd Dec. 1981 , F. W. Xing, B. H. Chen & C. X. Huang 111 (IBSC). Taiwan : Nantou Hsien , Jenai Hsiang, Meifeng-Tsuefeng, on roadside, alt. 2200 m , C. M. Wang, H. M. Lin & C. P. Lu 3265 (IBSC). Yunnan: Lincang, Yongde, Yongkang, Kui-Ge Mountains E, along the S 313, on slopes of the roadside, alt. 1376 m , 18 th Oct. 2020 , P. Li, Z. H. Liu, S . Y. Wang & H. L. Zheng 008662 (HZU, NPH). Discussion: — Yang & Huang (1995) recognized 27 species and 5 varieties of the genus Desmodium distributed in China , including D. caudatum De Candolle (1825a: 337) , which was transferred to the new genus Ohwia H. Ohashi (1999: 243) . This treatment was recognized by Huang & Ohashi (2010a , 2010b ), and thus Huang & Ohashi (2010b) recognized 32 species of Desmodium distributed in China . However, the genus Desmodium s. lat. is not monophyletic and needs to be divided ( Jabbour et al. 2018 ). In recent years, a series of work focusing on the division of Desmodium s. lat. had been done ( Ohashi & Ohashi 2012 , 2018a, 2018b, 2020, Ohashi et al. 2018a, 2018b, 2019a, 2019b, 2020a, 2020b). As for Chinese taxa, all native taxa recognized by Yang & Huang (1995) and Huang & Ohashi (2010b) should be transferred to Grona Loureiro (1790: 459) , Huangtcia H. Ohashi & K. Ohashi (in Ohashi et al. 2018a: 182), Leptodesmia ( Bentham 1852: 221 ) Bentham & Hooker f. (1865: 522), Pleurolobus J. Saint-Hilaire (1812: 192) , Polhillides H. Ohashi & K. Ohashi (2019a: 71) , Puhuaea H. Ohashi & K. Ohashi (2019b: 280) , Sohmaea H. Ohashi & K. Ohashi (2018b: 159) , Sunhangia H. Ohashi & K. Ohashi (2019b: 285) , or Uraria Desvaux (1813: 122) , while D. dichotomum De Candolle (1825a: 336) should be transferred to Bouffordia H. Ohashi & K. Ohashi (in Ohashi et al. 2018a: 179). Only three exotic species, i.e. D. intortum ( Miller 1768: 11 ) Urban (1920: 292) , D. scorpiurus ( Swartz 1788: 107 ) Desvaux (1813: 122) , and D. tortuosum ( Swartz 1788: 107 ) De Candolle (1825a: 332) , together with D. uncinatum , remain in the genus Desmodium s. str . An updated key for naturalized Desmodium s. str. in China is given below.