Evaluation on the development and application of Pingtan wild herbaceous flower based on Grey Relational Degree

Wild herbaceous flower, owing to its unique ornamental value and strong resistance, has become an important landscaping plant material. In this study, a line transect method was applied to investigate wild herbaceous flower resources in Pingtan. Grey correlation analysis was used to evaluate its development and application values. The aim was to screen excellent landscaping materials for Pingtan. Results showed that: 1) There was a total of 143 species, belonging to 118 genera and 40 families; 2) Wild herbaceous flowers were widespread in coastal sandy land, bedrock coast and hillside grassland, where they accounted for 51.05%. They accounted for 41.26% in field roadsides and wasteland; 3) The resistance of species was stronger, saline resistance species accounted for 53.15%, drought and barren resistance species accounted for 34.97%, waterlogging resistance species accounted for 11.88%; 4) Species have strong ornamental characteristics. The evaluation scores of flower and leaf color and ornamental value were more than 2; 5) Comprehensive evaluation results showed that the degree of correlation with ideal species, in 31 of the 143 wild herbaceous flowers, was higher than 0.8, including Ipomoea pes-caprae, Limonium sinense, Portulaca pilosa, Viola philippica, Ixeridium chinense and Anagallis arvensis, which could be directly applied in garden configuration.