A new species of Sedum (Crassulaceae) from Mount Danxia in Guangdong, China

Abstract

Sedum jinglanii, a new species of Crassulaceae from Mount Danxia in Guangdong, China, is described and illustrated. Phylogenetic analysis based on the internal transcribed spacer (ITS) region of nrDNA suggests that the new species belongs to S. sect. Sedum sensu Fu and Ohba (2001) in the “Flora of China”, and is sister to a clade comprising S. alfredi and S. emarginatum with high support values (SH-aLRT = 84, UFBS = 95) but is distantly related to S. baileyi. The new species is morphologically similar to S. alfredi but it can be distinguished from the latter in its opposite leaves (vs. alternate leaves), its usually wider leaves (0.4–1.2 cm vs. 0.2–0.6 cm), its usually shorter petals (3.4–4.5 mm vs. 4–6 mm), its shorter nectar scales (0.4–0.5 mm vs. 0.5–1 mm), its shorter carpels (1.5–2.6 mm vs. 4–5 mm), and its shorter styles (0.6–0.9 mm vs. 1–2 mm). The new species can be easily distinguished from S. emarginatum which both have opposite leaves by its short, erect or ascending rhizome (vs. long and prostrate rhizome in the latter), shorter petals (3.4–4.5 mm vs. 6–8 mm) and shorter carpels (1.5–2.6 mm vs. 4–5 mm). It can also be easily distinguished from S. baileyi by its short, erect or ascending rhizome (vs. long and prostrate rhizome) and its shorter style (0.6–0.9 mm vs. 1–1.5 mm).

The origin and dispersal of Firmiana danxiaensis among isolated specific landscapes

“…Owing to their unique terrains, island‐like Karst and Danxia landscapes are home to large numbers of species with an extraordinary degree of endemism (Clements et al, 2006; Liu et al, 2021). Currently, progress have been made in characterizing the geographic patterns of species richness and endemism in Karst and Danxia landscapes (Chung et al, 2014; Xu et al, 2021; Yang et al, 2021b; Li et al, 2022; Huang et al, 2023), though only several studies focused on the population genetics of the Karst and Danxia endemics (Wang et al, 2017; Jiang et al, 2021; Chen et al, 2022).…”