America’s flora is at risk, but it can be saved. Today nearly 30% of the native flora in the United States is considered to be of conservation concern. Without human intervention, many of these plants may be gone within our lifetime. 80% of at-risk species are closely related to plants with economic value and more than 50% are related to crop species. Plants in Peril. CPC’s National Collection of Endangered Plants is composed of the most imperiled plants in the country. An important conservation resource, the Collection is a backup in case a species becomes extinct or no longer reproduces in the wild. Live plant material is collected from nature under controlled conditions and then carefully maintained as seed, rooted cuttings or mature plants.