Invasive alien plants in China: An update.

•The latest 403 invasive alien plants in China are updated.•A summary of five volumes of 'Alien Invasive Flora of China' and recent invasive plants reports.•Compared with weeds, invasive plants emphasis on the destruction of biodiversity and native ecosystems.

Flora of Mongolia: annotated checklist of native vascular plants.

In this study, we critically revised and updated the checklist of native vascular plants of Mongolia. The checklist comprises 3,041 native vascular plant taxa (2,835 species and 206 infraspecific species) from 653 genera and 111 families, including 7 lycophytes, 41 ferns, 21 gymnosperms, and 2,972 angiosperms. In the angiosperms, we identified the 14 families with the greatest species richness, ranging from 50 to 456 taxa.

Combustion Characteristics of Low Calorific Value Biogas and Reaction Path of NOx Based on Sensitivity Analysis.

The combustion mechanism of biogas mixture is unclear, which leads to the lack of basis for the control of operating parameters. Combustion characteristics and reaction path of typical low calorific value biogas with variation of preheating temperature and air equivalence ratio () are discussed in this paper. Preheating can not only improve the flame propagation speed and flame temperature, but also increase the proportion of NO in the product at the end of combustion flame.

Twenty years of Chinese vascular plant novelties, 2000 through 2019.

From 2000 to 2019, 11,895 new names or new additions to the Chinese vascular flora were proposed by 4226 individuals (4086 articles and 140 books), as documented in the Chinese Plant Names Index (CPNI). During those 20 years, 4407 new taxa of vascular plants were described from China, including 7 new families, 132 new genera, 3543 new species, 68 new subspecies, 497 new varieties and 160 new forms. Additionally, 3562 new combinations and names at new rank and 306 new replacement names were also proposed.

Taxonomic studies on the genus (Aristolochiaceae) from China: II. (Aristolochiaceae), a new species from Guizhou, China.

A new species of was recently discovered from Guizhou, China and is here named as . It is most similar to and , but differs in the morphology of leaves and flowers. A detailed description for the new species, along with line drawings, photographs, as well as morphological comparisons with similar species, are provided.

Extraction, characterization and antioxidant activity of polysaccharide from Pouteria campechiana seed.

In this study, the seed polysaccharides (PCSP) was ultrasonic-assisted extracted from Pouteria campechiana and optimized by response surface method (RSM). After separation and purification by DEAE-52 cellulose column and Sephadex G-75 glucan gel column, the pure polysaccharide component of PCSPa-1 was obtained, and its structure and antioxidant activity were analyzed. The results showed that the optimal parameters of PCSP with maximum yields (15.

The taxonomic revision of Asian (Aristolochiaceae) V: two new species from Yunnan, China.

X.X.Zhu & J.

Complete Chloroplast Genomes and Comparative Analysis of Sequences Evolution among Seven (Aristolochiaceae) Medicinal Species.

Aristolochiaceae, comprising about 600 species, is a unique plant family containing aristolochic acids (AAs). In this study, we sequenced seven species of , and retrieved eleven chloroplast (cp) genomes published for comparative genomics analysis and phylogenetic constructions. The results show that the cp genomes had a typical quadripartite structure with conserved genome arrangement and moderate divergence.

Morphological study of floral nectaries in and the probable origin of the echinate fruit surface.

A conspicuous nectary disk is common but has a distinguishing morphology in the cosmopolitan genus . Our study focuses on the morphology of floral nectaries in 21 representatives of and . Two main types of nectaries were documented: a mix of inter- and extrastaminal nectaries existed between the corolla and the stigma, while the intrastaminal nectaries were distributed between the stigma and the stamen bases.

High risk of plant invasion in the understory of eucalypt plantations in South China.

Eucalypt plantations expand rapidly out of their natural distribution zones, thus inducing a concern on their effects on biodiversity and ecosystem functions. We compare the understory plant diversity of 46 plots of eucalypt plantations, including early and later stages in rotation, with that of 21 plots of contrast vegetation, including other types of plantations and secondary shrub grassland, in Guangdong and Guangxi Provinces, South China. Although the overall plant diversity did not change significantly in eucalypt plantations relative to the contrast vegetation, the community structures changed dramatically.