Calyptronoma rivalis NatureServe Explorer Species Reports — NatureServe Explorer is a source for authoritative conservation information on more than 50,000 plants, animals and ecological communtities of the U.S and Canada. NatureServe Explorer provides in-depth information on rare and endangered species, but includes common plants and animals too. NatureServe Explorer is a product of NatureServe in collaboration with the Natural Heritage Network.
ITIS Reports — Calyptronoma rivalis ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.
FWS Digital Media Library — The U.S. Fish and Wildlife Service’s National Digital Library is a searchable collection of selected images, historical artifacts, audio clips, publications, and video.This palm was added to the endangered species list of the United States in 1990, with a threatened status. At that time it was believed to be endemic to Puerto Rico and limited to 3 populations with an estimated 220 total individuals remaining. In 1995, botanists revised the taxonomy of genus Calyptronoma, placing Calyptronoma quisqueyana in synonymy with the rare palm. Then the species included all of the individuals previously named C. quisqueyana, extending its distribution to the island of Hispaniola. There it is not uncommon. Furthermore, its numbers on Puerto Rico increased to over 500, and then it was introduced to a few new areas on the island. The United States Fish and Wildlife Service will not remove the palm from the endangered species list yet, because its Puerto Rican members are on private land, are not protected, and in some cases, are not reproducing successfully. The plants are located on land that is threatened with habitat destruction from development and habitat degradation resulting from poor management. The palm is more plentiful on Hispaniola, but its status there is not well known
