Abstract
Lysimachia fanii, a new species of Lysimachia (Subgen. Idiophyton, Primulaceae), is described and illustrated from Guangxi, China based on morphological and molecular data. Lysimachia fanii differs from L. verbascifolia, L. rupestris and L. alpestris mainly by the habit being nearly rosulate, leaves congested at the apex of the rhizome, leaf blades spatulate to narrowly oblanceolate and flowers solitary. Phylogenetic analyses supported L. verbascifolia as sister to L. fanii. This new species is endemic to limestone areas in Liucheng county of Guangxi, China.
Highlights
The genus Lysimachia L. (1753: 146) includes about 190 species and was originally placed in Primulaceae (Cronquist 1981, Takhtajan 1997), but later transferred into Myrsinaceae, based on morphological and molecular evidence (Anderberg and Ståhl 1995, Anderberg et al 1998, 2002, Källersjö et al 2000, Hao et al 2004)
During fieldwork in May 2018, we discovered an unknown species in Lysimachia
The combined matrix has a length of 3649 aligned characters (ITS: 653bp, atpF-atpH: 512bp, rpl32-trnL: 728bp, trnL-trnF: 946bp, trnS-G: 810bp), of which 363 are parsimony informative
Summary
The genus Lysimachia L. (1753: 146) includes about 190 species and was originally placed in Primulaceae (Cronquist 1981, Takhtajan 1997), but later transferred into Myrsinaceae, based on morphological and molecular evidence (Anderberg and Ståhl 1995, Anderberg et al 1998, 2002, Källersjö et al 2000, Hao et al 2004). After morphological observation and consulting relevant literature (Chen and Hu 1979, Chen et al 1989, Hu and Kelso 1996, Tong et al 2017), we confirm that the rare plant is a new species and has been placed into subgen. The two samples of the new species (L. fanii) are clustered into subgenus Idiophyton with strong support values in both MP and BI analyses (BS= 100%, PP = 0.99).
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