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Short Communication
Dichodon parvipetalum, a new combination for the Chinese Caryophyllaceae
expand article infoGang Yao
‡ Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
Open Access

Abstract

The generic name Dichodon (Bartl. ex Rchb.) Rchb. was previously reinstated based on results from recent molecular phylogenetic studies. Accordingly, Dichodon parvipetalum (Hosok.) G. Yao, a new combination for the species Cerastium parvipetalum Hosok. is proposed.

Keywords

Caryophyllaceae , Cerastium , Dichodon , Dichodon parvipetalum , China

Introduction

The genus Cerastium L. in the broad sense consists of nearly 100 species mainly distributed in temperate and cold regions, with 23 species occurring in China (Lu and Morton 2001). Traditionally, the genus was subdivided into two subgenera: Cerastium (characterized by five carpels, five styles and ten capsule teeth) and Dichodon (Bartl. ex Rchb.) Boiss. (characterized by three carpels, three styles and six capsule teeth) (Schischkin 1970). In a recent molecular phylogenetic study (Greenberg and Donoghue 2011), the subgenus Cerastium was supported as the sister-group of Moenchia Ehrhart., a clade with four styles and eight capsule teeth, while the other subgenus Dichodon was sister to Holosteum L., which has three styles and six capsule teeth. Based on these results, Hernández-Ledesma et al. (2015) accepted the subgenus Dichodon at the generic level and reinstated it as Dichodon (Bartl. ex Rchb.) Rchb. in their comprehensive taxonomic study of Caryophyllales. In the Flora of China, two species (viz. Cerastium cerastoides (L.) Britton and C. parvipetalum Hosok.) belonging to the subgenus Dichodon were accepted (Lu and Morton 2001). The former species has already been transferred to Dichodon (Dichodon cerastoides (L.) Rchb.) by Reichenbach (1841), while the other species, endemic in Taiwan, has not been formally transferred to Dichodon. Accordingly, the new combination Dichodon parvipetalum is proposed below.

New combination

Dichodon parvipetalum (Hosok.) G. Yao, comb. nov.

Basionym

Cerastium parvipetalum Hosok., Trans. Nat. Hist. Soc. Taiwan 22: 227. 1932. TYPE: CHINA. Taiwan, Kaohsiung, 3 Jan. 1931, T. Hosokawa 93 (Holotype: TAI!, no.116065)

Acknowledgements

The author is indebted to the curator of the herbaria of National Taiwan University (TAI) for providing the image of the specimen. This work was supported by the National Natural Science Foundation of China (grant no. 31500180) and the Orientation Training Programme for Postdoctor from Yunnan Province to the author.

References

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