Thalictrum hengduanshanense, T. longistipitatum and their morphologically similar species, 1753

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), pp. 1-20 : 16

Key to morphologically similar species:—To facilitate the identification of Thalictrum hengduanshanense, T. longistipitatum and their morphologically similar species , a diagnostic key is given below.

1a. Carpels glabrous; styles of carpels apically uncinate or circinate .................................................................................. T. rostellatum

1b. Carpels glandular-pubescent; styles of carpels straight or apically slightly recurved........................................................................2

2a. Styles of carpels and achenes straight; achenes subsessile ................................................................................................... T. wangii

2b. Styles of carpels and achenes apically slightly recurved; achenes distinctly stipitate .......................................................................3

3a. Pedicels apically abruptly recurved; styles of carpels and achenes ca. 1 mm long.................................................. T. longistipitatum

3b. Pedicels straight; styles of carpels and achenes ca. 2 mm long..........................................................................................................4

4a. Inflorescence laxly branched, corymb-like; achenes ca. 9 mm long; achene bodies narrowly lunate, body width/body length = ca. 1/3 ...................................................................................................................................................................... T. hengduanshanense

4b. Inflorescence narrowly paniculiform; achenes 4.5‒7 mm long; achene bodies broadly lunate, body width/body length = ca. 1/2.... .................................................................................................................................................................................. T. tsawarungense