Homostylium albescens var. niveum (Hand. - Mazz.) Z. X. Fu, 2025

Chen, Xinyu & Fu, Zhixi, 2025, Resurrection of the genus Homostylium Nees for the former Aster ser. Albescentes Y. Ling (Astereae, Asteraceae), with an updated generic synopsis, PhytoKeys 259, pp. 27-66 : 27-66

publication ID	https://doi.org/10.3897/phytokeys.259.155606
DOI	https://doi.org/10.5281/zenodo.15683979
persistent identifier	https://treatment.plazi.org/id/B209DEA8-CBA3-5A04-B82C-DC84DCB99299
treatment provided by	PhytoKeys by Pensoft
scientific name	Homostylium albescens var. niveum (Hand. - Mazz.) Z. X. Fu
status	comb. nov.

Treatment

1.11. Homostylium albescens var. niveum (Hand. - Mazz.) Z. X. Fu comb. nov.

≡ Aster albescens var. niveus Hand. - Mazz. View in CoL , Acta Hort. Gothob. 12: 208. 1938. Type: India, Sikkim, Jakpho, Napa Hill, alt. 3017 m, 25 Oct. 1885, C. B. Clarke 41356 (holotype, E 00531283!; isotype, K 00089039!) (Suppl. material 1: figs S 23, A 24).

Type.

India • Sikkim, Jakpho, Napa Hill , alt. 3017 m, 25 Oct. 1885, C. B. Clarke 41356 (holotype, E 00531283 !; isotype, K 00089039 !) (Suppl. material 1: figs S 23, A 24) .

Diagnosis.

Leaves abaxially densely cottony tomentum.

Distribution.

China, Chongqing, W Sichuan (Emei Mount., Xiaojin), SE Shaanxi (Pingli); N India (Sikkim).

Habitat.

Subalpine or subarctic biome.

Etymology.

The varietal name “ niveum ” is derived from the Latin “ nix ”, meaning “ snow ”, combined with the neuter suffix “ - eum ”. The name likely refers to its habitat in the snow-covered subalpine and subarctic biome, or to the abaxial leaf densely covered in white tomentum.

Specimens examined.

China • Chongqing: Nanchuan, J. H. Xiong & Z. L. Zhou 94046 ; • Shaanxi: Pingli, Field Collection Team of Western Xida’an Kang District 20132 ; • Sichuan: Emei, W. P. Fang 3297, 3182; Xiaojin, T. T. Yu 2429 ; India • Sikkim: Jakpho, C. B. Clarke 41356 (E 00531283, K 00089039) .

Notes.

The new combination Sinosidus albescens (DC.) G. L. Nesom proposed by Nesom (2020 g) did not include this variety, although it comprised ten varieties (including the type variety).