Columellia oblonga, a flowering plant in the family Columelliaceae, which is endemic to the Americas. Image credit: C. Ulloa
ANN ARBOR-An international research team has assembled the first complete list of all known vascular plant species in the Americas. The searchable database contains nearly 125,000 species representing one-third of all known vascular plants worldwide. Vascular plants are land plants with specialized internal-transport and vertical-support tissues. The vast majority of plant species on Earth are vascular plants, including trees, shrubs, grasses, flowering plants and ferns. In a project led by the Missouri Botanical Garden, 12 regional and national plant lists were merged into a single super-list for the Western Hemisphere. Twenty-four authors, including two from the University of Michigan, contributed to a paper published Dec. 22 .
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