Sunday, April 12, 2020

[Botany • 2020] Hanceola suffruticosa (Lamiaceae, Nepetoideae) • A New Species from the Sino-Vietnamese Border

Hanceola suffruticosa Y.P. Chen, A.J. Paton & C.L. Xiang

in Chen, Paton & Xiang, 2020
木茎四轮香 || DOI: 10.3897/phytokeys.145.49995 
Photographs by Ya-Ping Chen

Hanceola is a genus of eight herbaceous species previously thought to be endemic to southern China. However, Hanceola suffruticosa, a new species described here from China and Vietnam, differs from all other species of Hanceola by its subshrubby habit. It is also distinct in its shallowly bicrenate laminae and densely purplish glandular puberulent inflorescences. The morphological description, illustrations, and distribution of the new species are presented. A key to all species of Hanceola is also provided.

Keywords: Hanceola, Hanceolinae, new species, Ocimeae, Sino-Vietnamese border

Figure 1. Hanceola suffruticosa.
A Habitat B, C plants D stem E leaves F inflorescences G post-flowering calyces H, I flowers in frontal view J flowers in lateral view (Photographs by Ya-Ping Chen).

Figure 2. Hanceola suffruticosa.
 A Flowers B dissected corolla C pistil D dissected calyx and ovary (Photographs by Ya-Ping Chen).

Hanceola suffruticosa Y.P. Chen, A.J. Paton & C.L. Xiang, sp. nov.

Diagnosis: Hanceola suffruticosa differs from other species of Hanceola by being a subshrub with woody rather than herbaceous stems, shallowly bicrenate margin of laminae rather than coarsely dentate, and densely purplish glandular puberulent inflorescences rather than subglabrous or with white glandular or eglandular hairs.

Etymology: The epithet of the new species refers to its suffrutescent habit, which is distinct in the genus.

Common name (assigned here): Mu Jing Si Lun Xiang (木茎四轮香; Chinese name).

Distribution and habitat: Hanceola suffruticosa is now only known at the Sino-Vietnamese border of Malipo County in Yunnan Province, China and Quan Ba District of Ha Giang Province, Vietnam (Fig. 3). It grows in the evergreen mixed forests at an elevation of 1100–1150 m.

 Ya-Ping Chen, Alan J. Paton and Chun-Lei Xiang. 2020. Hanceola suffruticosa (Lamiaceae, Nepetoideae), A New Species from the Sino-Vietnamese Border.  PhytoKeys. 145: 131-138. DOI: 10.3897/phytokeys.145.49995