Abstract
The growing public concern about endangered plants is well founded. It is estimated that there are between 235,000 (Raven et al., 1986) and 380,000 (IUCN, 2010) species of vascular plants (including ferns and fern allies, gymnosperms, and flowering plants) in the world today; two-thirds of these species are found in the tropics (Raven et al., 1986). The World Conservation Union (IUCN, 2004, 2010) currently lists 42,490 species (13.8% of the world's flora) as threatened, and 8903 species of plants (2.9% of the world's flora) as endangered. Threatened plants are found among 363 plant families in 294 countries. The U.S. Fish and Wildlife Service reports 645 endangered species and 151 threatened species of flowering plants in the United States (U.S.) as of 7 October 2010.
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