[Botany • 2023] Stachys yingzuijieensis (Lamiaceae) • Molecular and Morphological Evidence for A New Species from Hunan, China

Stachys yingzuijieensis L.Wu & Y.P.Chen,   

 in Xue, Cai, Zhan, Li, Wu et Chen, 2023.

鹰嘴界水苏  ||  DOI: 10.3897/phytokeys.236.112741

Abstract

Stachys yingzuijieensis, a new species from western Hunan, China, is described and illustrated. Molecular phylogenetic analyses based on three nuclear ribosomal DNA loci (ETS, ITS and 5S-NTS) recovered S. yingzuijieensis within the Stachys clade and as a sister group of S. arrecta. The two species can be easily distinguished by the morphology of lamina, corolla and nutlet. A key to all species of Stachydeae from China is also provided.

Key words: Eurystachys clade, Lamioideae, micromorphology, Stachydeae, taxonomy

Morphology of Stachys yingzuijieensis from the type locality
A habitat B habit C–D inflorescence E adaxial view of lamina F abaxial view of lamina G roots and rhizomes H frontal view of corolla I lateral view of calyces J dissected corolla K nutlets

(A–J photographed by Lei Wu K photographed by Ya-Ping Chen).

 Stachys yingzuijieensis L.Wu & Y.P.Chen, sp. nov.

 

Diagnosis: Stachys yingzuijieensis is most closely related to S. arrecta, but differs in its lamina oblong to elliptic-lanceolate (vs. cordate) with margin crenulate (vs. coarsely serrate), corolla white (vs. pink with purple spots) with tube included in calyx (vs. exerted from calyx) and nutlet surface smooth (vs. verrucate).

Etymology: The specific epithet is derived from the type locality of the new species, i.e. the Yingzuijie National Nature Reserve in western Hunan Province, China.

Chinese name (assigned here): yīng zhuǐ jiè shuǐ sū (鹰嘴界水苏).

Ling Xue, Jia-Hua Cai, Min Zhan, Xiao-Ping Li, Lei Wu and Ya-Ping Chen. 2023. Molecular and Morphological Evidence for A New Species of Stachys (Lamiaceae) from Hunan, China. PhytoKeys. 236: 121-134. DOI: 10.3897/phytokeys.236.112741