Calyptronoma rivalis

Calyptronoma rivalis is a pinnately compound leaved palm species that is found in Haiti, the Dominican Republic and Puerto Rico.[2] Its common names include palma de manaca and Puerto Rican manac.

Calyptronoma rivalis

Threatened (ESA)
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Arecales
Family: Arecaceae
Genus: Calyptronoma
Species:
C. rivalis
Binomial name
Calyptronoma rivalis
Synonyms[1]
  • Cocops rivalis O.F.Cook
  • Calyptrogyne rivalis (O.F.Cook) León
  • Calyptronoma quisqueyana L.H.Bailey
  • Calyptrogyne quisqueyana (L.H.Bailey) León

Description

C. rivalis stems grow singly and reach heights of 4–15 m, with stems 15–30 cm in diameter.[2] It grows in waterlogged areas near the banks of streams; in Hispaniola it occurs less than 450 m above sea level, and Calyptronoma plumeriana replaces it above that elevation.[2]

Conservation

This palm was added to the endangered species list of the United States in 1990, with a threatened status.[3] At that time it was believed to be endemic to Puerto Rico and limited to 3 populations with an estimated 220 total individuals remaining.[3] In 1995, botanists revised the taxonomy of genus Calyptronoma, placing Calyptronoma quisqueyana in synonymy with the rare palm.[4][5] Then the species included all of the individuals previously named C. quisqueyana, extending its distribution to the island of Hispaniola.[4] There it is not uncommon.[4] Furthermore, its numbers on Puerto Rico increased to over 500, and then it was introduced to a few new areas on the island.[4] 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.[4] The plants are located on land that is threatened with habitat destruction from development and habitat degradation resulting from poor management.[4] The palm is more plentiful on Hispaniola, but its status there is not well known.[4]

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References
  1. "Calyptronoma rivalis". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew. Retrieved 9 August 2020.
  2. Henderson, Andrew; Gloria Galeano; Rodrigo Bernal (1995). Field Guide to the Palms of the Americas. Princeton, New Jersey: Princeton University Press. ISBN 0-691-08537-4.
  3. USFWS. Determination of threatened status for the plant Calyptronoma rivalis. Federal Register February 6, 1990.
  4. USFWS. Palma de Manaca: Five-year Review. 2007.
  5. Zona, S. (1995). A Revision of Calyptronoma (Arecaceae). Principles 39(3): 140-151.


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