taxonID	type	description	language	source
3516957EFFB1FFF485B9B9FDFBCDF8B5.taxon	materials_examined	Type: — CHINA. Yunnan: Dêqên, Yunling town, on the way from Xidang spring to Yubeng village, in dry forests on slopes, alt. 2920 m, 11 July 2021, Y. P. Zeng & Y. F. Luo 530 (holotype IBSC, barcode unavailable; isotypes KUN, PE, barcodes unavailable). Fig. 6.	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFF485B9B9FDFBCDF8B5.taxon	diagnosis	Diagnosis: — Thalictrum hengduanshanense is most closely related to T. tsawarungense, but differs by having laxly branched, corymb-like (vs. narrowly paniculiform) inflorescences and larger (ca. 9 mm vs. 4.5 ‒ 7 mm long), narrowly lunate (vs. broadly lunate) achenes (body width / body length = ca. 1 / 3 vs. ca. 1 / 2).	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFF485B9B9FDFBCDF8B5.taxon	description	Description: — Perennial herbs. Roots fibrous. Stem 30 ‒ 60 cm tall, distally branched, glandular-pubescent. Leaves 2 ‒ 3 - ternate; blade triangular, 5 ‒ 10 cm long, 4 ‒ 10 cm broad; leaflets broadly obovate, obliquely broadly obovate, suborbicular or broadly ovate, 0.5 ‒ 1.5 cm long, 0.5 ‒ 1.5 cm broad, herbaceous, both sides densely glandularpubescent, adaxially green and abaxially pale green, base rounded or subcordate, apex obtuse or acute, 3 - lobate; lobes entire or 1 ‒ 2 - crenate, apex obtuse or acute; veins submerged adaxially, raised abaxially; petioles glandular-pubescent, 1 ‒ 3 cm long; stipules sheath-like or free, obliquely broadly ovate, membranous, margin wavy. Inflorescence a panicle, laxly branched, corymb-like, glandular-pubescent. Pedicels 1 ‒ 1.5 cm long, glandular-pubescent. Flowers bisexual. Sepals 4 or 5, broadly elliptic or ovate, 2.5 ‒ 3 mm long, 2 ‒ 2.5 mm broad, abaxially sparsely glandular-pubescent, whitish or tinged with pinkish; basal nerves 3 ‒ 5, simple or branched. Stamens ca. 16, 3 ‒ 5 mm long; filaments narrowly oblanceolate-linear, 2.5 ‒ 4 mm long, white; anthers narrowly oblong, 0.6 ‒ 0.8 mm long, ca. 0.4 mm broad, apex obtuse, white. Carpels 2 ‒ 6, ca. 3 mm long, glandular-pubescent, stipitate, whitish tinged with purplish; stipe ca. 0.4 mm long; ovary obliquely narrowly obovate, ca. 1 mm long; style ca. 2 mm long, straight or apically slightly recurved; stigma inconspicuous. Achenes ca. 9 mm long, glandular-pubescent, long stipitate, pink when fresh; stipe ca. 2 mm long; body narrowly lunate, body width / body length ca. 1 / 3, shallowly ribbed, compressed; style persistent, apically slightly recurved. 2 n = 14.	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFF485B9B9FDFBCDF8B5.taxon	biology_ecology	Phenology: — Flowering from June to August; fruiting from July to September.	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFF485B9B9FDFBCDF8B5.taxon	distribution	Distribution and habitat: — Thalictrum hengduanshanense is currently known only from the southern Hengduan Mountains region in southeastern Xizang (Zayu) and northwestern Yunnan (Dêqên, Weixi), China (Fig. 13). It grows in mixed conifer-broadleaved forests on slopes, hot dry valleys or along open streamside at elevations of 1900 ‒ 3100 m above sea level. The Hengduan Mountains region, which is at the end of the eastern Himalayan range in southwestern China, includes mainly southern Gansu, southeastern Qinghai, western Sichuan, southeastern Xizang, and northwestern Yunnan. Steep gorges and high peaks dominate this region, which is recognized as a biodiversity “ hotspot ” (Boufford & van Dyck 1999, Myers et al. 2000), and harbors the richest temperate flora of seed plants in the world (Wu 1988, Li & Li 1993, Luo et al. 2016, Liu et al. 2021).	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFF485B9B9FDFBCDF8B5.taxon	etymology	Etymology: — The specific epithet of this new species, “ hengduanshanense ”, is derived from the southern Hengduan Mountains region (“ shan ” means “ mountain ” in Chinese), where the new species occurs.	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFF485B9B9FDFBCDF8B5.taxon	materials_examined	Additional specimens examined (paratypes): — CHINA. Xizang: Zayu, Anonymous 75 (HITBC, herb. no. 083724), SE Xizang Exped. 147 (PE 02283031, PE 02283032, PE 02283033). Yunnan: Dêqên, K. M. Feng 5214 (KUN 0690082, KUN 0690093, KUN 0690504, PE 00450029,), Qinghai-Xizang Exped. 1846 (CDBI 0026439, CDBI 0026440, HITBC, herb. no. 003380, KUN 0690106, PE 01108989, PE 01108990), Qinghai-Xizang Exped. 2589 (CDBI 0026441, PE 01108991), L. Xie & J. F. Mao 133 (PE 01569465), L. Xie & J. F. Mao 134 (PE 01569409), L. Xie & J. F. Mao 135 (PE 01569410), J. S. Yang s. n. (KUN 0690094), T. T. Yu 8264 (KUN 0690101, KUN 0690500, PE 00450025); Weixi, K. M. Feng 4833 (KUN 0690084, KUN 0690085, KUN 0690086).	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFF485B9B9FDFBCDF8B5.taxon	conservation	Conservation status: — Thalictrum hengduanshanense is currently known only from four populations in southeastern Xizang (Zayu) and northwestern Yunnan (Dêqên, Weixi), China. The Dêqên population we discovered recently consists of more than 300 individuals. The size of the Zayu and Weixi populations remains unknown. The conservation status of T. hengduanshanense should therefore be considered as “ Data Deficient (DD) ” before adequate information of this species is acquired (IUCN Standards and Petitions Committee 2019).	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFFE85B9BE65FD13F9EE.taxon	materials_examined	Type: — CHINA. Yunnan: Dêqên, Yunling town, on the way from Xidang spring to Yubeng village, in forests on mountain slopes, alt. 3450 m, 11 July 2021, Y. P. Zeng & Y. F. Luo 528 (holotype IBSC, barcode unavailable; isotypes KUN, PE, barcodes unavailable). Fig. 11.	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFFE85B9BE65FD13F9EE.taxon	diagnosis	Diagnosis: — Thalictrum longistipitatum is closely related to T. hengduanshanense, but differs by having apically abruptly recurved (vs. straight) pedicels and shorter styles (ca. 1 mm vs. ca. 2 mm long).	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFFE85B9BE65FD13F9EE.taxon	description	Description: — Perennial herbs. Roots fibrous. Stem 35 ‒ 60 cm tall, distally branched, glandular-pubescent. Leaves 2 ‒ 3 - ternate; blade triangular, 5 ‒ 10 cm long, 4 ‒ 10 cm broad; leaflets broadly obovate, obliquely broadly obovate, suborbicular or broadly ovate, 0.5 ‒ 2 cm long, 0.5 ‒ 2 cm broad, herbaceous, both sides densely glandularpubescent, adaxially green and abaxially pale green, base rounded or subcordate, apex obtuse or acute, 3 - lobate; lobes entire or 1 ‒ 2 - crenate, apex obtuse or acute; veins submerged adaxially, raised abaxially; petioles glandular-pubescent, 0.5 ‒ 4 cm long; stipules sheath-like or free, obliquely ovate, membranous, margin entire. Inflorescence a panicle, many-branched, sub-corymbiform, glandular-pubescent. Pedicels 2 ‒ 4 cm long, apically abruptly recurved, glandularpubescent. Flowers bisexual, drooping. Sepals 4 ‒ 5, broadly elliptic, ovate or broadly ovate, 2 ‒ 3 mm long, 1.5 ‒ 2 mm broad, abaxially glandular-pubescent, whitish or tinged with pinkish; basal nerves 3 ‒ 5, simple or branched. Stamens 9 ‒ 12, 2 ‒ 3 mm long; filaments narrowly oblanceolate-linear, 1.4 ‒ 2.0 mm long, white; anthers oblong, 0.6 ‒ 0.9 mm long, ca. 0.5 mm broad, apex obtuse, white. Carpels 3 ‒ 6, ca. 2.5 mm long, glandular-pubescent, subsessile; ovary obliquely narrowly obovate, ca. 1 mm long; style ca. 1.2 mm long, apically slightly recurved; stigma lanceolate. Achenes 7 ‒ 9 mm long, densely glandular-pubescent, long stipitate; stipe 3 ‒ 6 mm long; body narrowly lunate-fusiform, shallowly ribbed, compressed; style persistent, apically recurved, ca. 0.6 mm long. Chromosome number unknown.	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFFE85B9BE65FD13F9EE.taxon	biology_ecology	Phenology: — Flowering from June to August; fruiting from July to September.	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFFE85B9BE65FD13F9EE.taxon	distribution	Distribution and habitat: — Thalictrum longistipitatum is currently known only from northwestern Yunnan (Dêqên) and southeastern Xizang (Bomi, Zayu), China (Fig. 13). It grows in conifer-broadleaved forests on mountain slopes at elevations of 3100 ‒ 3450 m above sea level.	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFFE85B9BE65FD13F9EE.taxon	etymology	Etymology: — The specific epithet of the new species, “ longistipitatum ”, refers to its impressively long stipes of achenes.	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFFE85B9BE65FD13F9EE.taxon	materials_examined	Additional specimens examined (paratypes): — CHINA. Xizang: Bomi, W. Q. Fei 58 (IBSC, barcode unavailable), L. Wang, X. Q. Guo & Y. P. Zeng 3350 (IBSC, barcode unavailable); Zayu, B. S. Li, S. Z. Cheng & Z. C. Ni 7224 (PE 00767246), Qinghai-Xizang Exped. 73 - 230 (KUN 0690505, KUN 0690506, PE 00450030, PE 00450031). Yunnan: Dêqên, Qinghai-Xizang Exped. 130 (HITBC, herb. no. 074526), L. Xie & J. F. Mao 136 (PE 01569411), L. Xie & J. F. Mao 137 (PE 01569412), L. Xie & J. F. Mao 138 (PE 01569413).	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
3516957EFFB1FFFE85B9BE65FD13F9EE.taxon	conservation	Conservation status: — Thalictrum longistipitatum is currently known only from four populations in northwestern Yunnan (Dêqên) and southeastern Xizang (Bomi, Zayu), China. Both Bomi and Dêqên populations consist of more than 100 individuals. The size of the Zayu population remains unknown. The conservation status of T. longistipitatum should therefore be considered as “ Data Deficient (DD) ” before adequate information of this species is acquired (IUCN Standards and Petitions Committee 2019).	en	Zeng, You-Pai, Yuan, Qiong, Yang, Qin-Er (2022): Thalictrum hengduanshanense and T. longistipitatum (Ranunculaceae), two new species from southeastern Xizang and northwestern Yunnan, China. Phytotaxa 571 (1): 1-20, DOI: 10.11646/phytotaxa.571.1.1
