, a new species of (Rosaceae) from southwest China.

Through detailed morphological comparison and robust molecular evidence, we confirm M.T.An & Xu Wu as a new species of Rosaceae from Guizhou province, southwest China.

 (Asteraceae, ), a new species from Guizhou Province, China.

Z.Li (Asteraceae, Astereae), a new species from Guizhou, China, is described and illustrated here. Morphological and molecular analyses based on nuclear ribosomal DNA internal transcribed spacer (nrDNA ITS) confirm its distinct status.

 (Euphorbiaceae), a new species from Southwest China based on morphological characters and phylogenetic evidence.

M.T.An & J.

 (Lamiaceae), a new species from Guizhou, China.

, a new species from Guizhou Province of southwestern China, is described and illustrated. Morphologically, is similar to , but can be easily distinguished from the latter by ovate-lanceolate bracts, purple corolla, and foot-shaped fused lower arms of connective. In addition, is morphologically similar to , but differs by having 3-4-pinnate leave, ovate-lanceolate bracts, puberulent calyx, and longer upper arms of connective.

(Oxalidaceae), a new species from Danxia landforms in Guizhou, China.

, a new species of Oxalidaceae from Danxia landforms of Xishui County, Guizhou, China, is described and illustrated. It is morphologically similar to by the two lateral leaflets arranged at about 180° angle and oblong pink petals with lilac veins, but clearly differs from the latter by leaflets almost as long as wide, obliquely obcordate lateral leaflets, shorter peduncles, longer capsule (1.2-1.

 (Hypericaceae), a new species from Guizhou, China.

M.T.An & T.

Competition and synergistic mechanisms of species in association based on niche theory.

We examined the niche characteristics and interspecific covariant relationship of main species in association in Chishui National Nature Reserve under disturbance condition, and analyzed the mechanism of competition and coexistence across different species. The results showed that there were 67 species from 53 genera and 40 families in the association. The importance values, Shannon niche breadth index (), and Levins niche breadth index () of were the largest, indicating its absolute dominant status in association.

 (Balsaminaceae), a new species from Yunnan, China.

S.X. Yu, Chang Y.

Rediscovery of (Lamiaceae, Lamioideae), a rare endemic species from southwestern China, after one century.

(Lamiaceae) was described in 1913 based on a single gathering from northwestern Yunnan of China collected in 1905, and thereafter no further collections were observed until 2019. We rediscovered the rare endemic species in Lushui County, Yunnan. Molecular phylogenetic analyses based on four cpDNA markers (, , , and ) and the nuclear ribosomal internal transcribed spacer (ITS) region confirmed its infrageneric placement within subg.

The Complete Chloroplast Genome of the Vulnerable (Gesneriaceae): Structural Features, Comparative and Phylogenetic Analysis.

, a member of Gesneriaceae, is known as , which has been regarded a synonym of the former. The species is endemic to Guizhou, southwestern China, and is evaluated as vulnerable (VU) under the International Union for Conservation of Nature (IUCN) criteria. Until now, the sequence and genome information of remains unknown.

The complete chloroplast genome of the threatened (Dipentodontaceae).

is a monotypic genus of Dipentodontaceae and the only species, , is scattered in southwest China as well as adjacent Myanmar, northeast India and northern Vietnam. This species was evaluated as vulnerable in 'China Species Red List'. Here, we assembled and characterized the complete chloroplast (cp) genome of using Illumina sequencing data for the first time.