Thalictrum minshanicum Y. P. Zeng, Q. Yuan &amp; Q. E. Yang 2021, sp. nov.
Creators: name: Zeng, You-Pai
name: Yuan, Qiong
name: Yang, Qin-Er
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Ranunculales
Ranunculaceae
Thalictrum
Thalictrum minshanicum

description: 1. <i>Thalictrum minshanicum</i> Y. P. Zeng, Q. Yuan &amp; Q. E. Yang, <i>sp. nov.</i> Figs. 1, 3, 4. Type:— CHINA. Sichuan: Pingwu county, along Road S205, near Baima town, 32°44′59.83″N, 104°18′44.47″E, in forests, alt. 2090 m, 28 June 2020, <i>Y. P. Zeng &amp; Q. L. Huang 337</i> (holotype IBSC, barcode unavailable; isotypes CDBI, IBSC, PE, barcodes unavailable). <b>Description</b>:—Perennial herbs. Roots fibrous, distally tuberose. Stem to 150 cm tall, striate, puberulent, distally branched. Leaves 2‒4-ternate; blade triangular, 10‒18 cm long, 10‒18 cm broad; leaflets obovate, orbicular or broadly ovate, 1‒3 cm long, 1‒3 cm broad, herbaceous, both sides puberulent, green on adaxial side, pale green on abaxial side, base rounded or subcordate, apex obtuse or acute, 3-lobate; lobes entire or 2‒3-lobate, apex obtuse or acute; veins flat adaxially, slightly prominent abaxially; petiole slender, 3‒10 cm long; stipule membranous, margin torn. Inflorescence compound monochasia, corymbiform; rachis sparsely puberulent. Pedicels 1‒1.5 cm long, sparsely puberulent. Flowers bisexual, erect. Sepals 4‒5, caducous, elliptic, ca. 5 mm long, ca. 2.5 mm broad, white or purplish, glabrous. Stamens 45‒60, ca. 7 mm long; filament clavate, ca. 5.5 mm long, purplish; anther oblong, ca. 1.5 mm long, apex obtuse, white. Carpels 6‒10, sessile, ca. 2 mm long; ovary lunate-fusiform, shallowly ribbed, ca. 1 mm long; style slightly recurved, ca. 1 mm long; stigma conspicuous, linear, ca. 0.6 mm long. Achenes sessile, ca. 4 mm long, glabrous; body fusiform, profoundly ribbed; style persistent, slightly recurved at apex. <b>Distribution and habitat</b>:— <i>Thalictrum minshanicum</i> is currently known from southern Gansu (Wudu, Zhugqu) and northwestern Sichuan (Beichuan, Pingwu) (Fig. 5) in the Min Shan region of China. It grows in thickets or forests on slopes at altitudes of 1400‒2090 m above sea level. <b>Phenology</b>:—Flowering from June to August; fruiting from August to September. <b>Etymology</b>:—The specific epithet is derived from the Min Shan region, where the new species occurs. <b>Additional specimens examined</b>:— CHINA. Gansu: Wudu, <i>P.C. Kuo 5090</i> (WUK, barcode unavailable); Zhugqu, <i>P.C. Kuo 5390</i> (WUK, barcode unavailable). Sichuan: Beichuan, <i>C.L. Tang et al. 269</i> (CDBI0026275, CDBI0026276); Pingwu, <i>Anonymous 121</i> (CDBI0026442, CDBI0026443), <i>Y.P. Zeng &amp; Q.L. Huang 330</i> (IBSC, barcode unavailable), <i>Y.P. Zeng &amp; Q.L. Huang 448</i> (IBSC, barcode unavailable). <b>Conservation status</b>:— <i>Thalictrum minshanicum</i> is currently known from four populations in southern Gansu and northwestern Sichuan, China. The population in Pingwu, northwestern Sichuan, which we rediscovered recently, consists of no more than 100 individuals. The size of the other three populations remains unknown. The conservation status of <i>T. minshanicum</i> should therefore be considered as “Data Deficient (DD)” before adequate information of this species is acquired (IUCN Standards and Petitions Committee 2019). <b>Notes</b>:— <i>Thalictrum minshanicum</i> is most closely similar to <i>T. brevisericeum</i> Wang &amp; Wang (1974: 603) (Figs. 6, 7) in habit and in having puberulent stem and leaves, but differs by having conspicuously 3-lobate (vs. slightly 3-lobate) leaflets, glabrous (vs. abaxially puberulent) sepals, longer (ca. 7 mm vs. ca. 4 mm) and clavate (vs. oblanceolate-linear) filaments, conspicuous (vs. inconspicuous) stigmas, and persistent styles slightly recurved (vs. circinate) at apex (Figs. 3, 4). <i>Thalictrum brevisericeum</i> is widely distributed in China’s eastern and southern Gansu, western Henan, central and western Shaanxi, southwestern Shanxi, northwestern Sichuan, and northwestern Yunnan (Wang &amp; Wang 1979, Fu &amp; Zhu 2001, Wang 2018a; Fig. 5). Populations of northwestern Yunnan have been treated as a variety, i.e. var. <i>angustiantherum</i> Wang (2018a: 88). Another variety from Heishui in northwestern Sichuan, var. <i>pentagynum</i> Wang (2018a: 88), actually should belong to <i>T. uncinulatum</i> Franchet ex Lecoyer (1885: 169), a species distributed in Chongqing, Gansu, Guizhou, Hubei, Hunan, Shaanxi, Sichuan, and Yunnan, China (Zeng <i>et al</i>. 2021a). As mentioned before, specimens of <i>Thalictrum minshanicum</i> have been previously misidentified as <i>T. javanicum</i> or <i>T. ramosum</i>. <i>Thalictrum minshanicum</i> differs from <i>T. javanicum</i> (Fig. 8) by having puberulent stem and leaves and apically slightly recurved (vs. circinate) styles. From <i>T. ramosum</i> (Figs. 9, 10) it differs by having puberulent (vs. glabrous) leaves, longer stamens (ca. 7 mm vs. ca. 3 mm), and elliptic-fusiform (vs. lanceolate) achenes. It is to be noted that the true <i>Thalictrum javanicum</i> probably does not occur in China. The Chinese specimens previously identified as <i>T. javanicum</i> should belong to two recently described species. Those with a corymbiform inflorescence and widely distributed in China’s southern Chongqing, northern Guangdong, northern Guangxi, eastern Guizhou, southwestern Hubei, Hunan, Jiangxi and southern Zhejiang belong to <i>T. xinningense</i> Wang (2017: 408) (Wang 2018a, Zeng <i>et al.</i> 2021b), and those with a paniculiform inflorescence and widely distributed in China’s northeastern Chongqing, western Guizhou, northwestern Hubei, southern Shaanxi, Sichuan, Xizang, and Yunnan, and in Nepal, belong to <i>T. nepalense</i> Wang (2018b: 641). The independent specific status of <i>T. sessile</i> Hayata (1913: 6) from China’s Taiwan, a species previously treated as a synonym of <i>T. javanicum</i> (Wang &amp; Wang 1979, Li 1986, Liu 2000, Fu &amp; Zhu 2001), has been reinstated by Wang (2018a). In fact, Liu &amp; Hsieh (1976) and Yang &amp; Huang (1989, 1996, 2008) recognized <i>T. sessile</i> as an independent species. Indeed, further studies are needed to clarify the delimitation and geographical distribution of <i>T. javanicum</i>.
description: Published as part of <i>Zeng, You-Pai, Yuan, Qiong &amp; Yang, Qin-Er, 2021, Thalictrum minshanicum and T. pseudoramosum (Ranunculaceae), two new species from China, pp. 133-148 in Phytotaxa 502 (2)</i> on pages 133-134, DOI: 10.11646/phytotaxa.502.2.2, http://zenodo.org/record/5424987
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