1. Family: Arecaceae Bercht. & J.Presl
    1. Genus: Roystonea O.F.Cook
      1. Roystonea borinquena O.F.Cook

        This species is accepted, and its native range is Hispaniola to Virgin Islands.

    [PW]
    Distribution
    Puerto Rico, at low to middle elevations on soils derived from limestone. This palm is relatively common at the base of limestone hills (mogotes) along Puerto Rico's northern coast. Also from Vieques Is. and St. Croix, U.S. Virgin Islands. Extremely abundant on Hispaniola in all but the driest regions, up to ca. 800 m.
    General Description
    Trunk gray-brown to cinnamon-brown, to 15 m tall, 26.2-47. cm diam. Leaves ca. 15, lowest leaves hanging well below the horizontal; crownshaft 1.5-1.7 m long; petiole 30-55 cm long, rachis 3.8-4.5 m long; middle segments 67-125 cm long and 2.5-5.2 cm wide. Inflorescence 1-1.4 m long and 0.7-1.2 m wide; prophyll 43-74 cm long and 10.3-18.5 cm wide; peduncular bract 0.9-1.6 m long, widest at the middle, apex acuminate; rachillae 15-33.5 cm long and 1.4-2.5 mm diam. Staminate flowers creamy yellow with bright purple anthers; sepals triangular to reniform, 0.7-1.4 mm long and 1.2-2 mm wide; petals elliptical to ovate, 5.3-6.4 mm long and 3-3.7 mm wide; stamens 6-9, 4-7.4 mm long, filaments awl-shaped, 2.9-6 mm long, anthers 2.5-4.3 mm long; pistillode minute. Pistillate flowers creamy yellow, 2-4 per cm; sepals reniform, 1.2-2.4 mm long and 3-4.1 mm wide; petals ovate, 2.4-4.4 mm long; staminode shallowly 6-lobed, 2.3-3.2 mm long, free for 0.9-1.7 mm; gynoecium 1.7-3.3 mm long and 1.5-3.1 mm diam. Fruits spheroid to ellipsoid, 11.6-15 mm long, 9-12.4 mm dorsiventral thickness, and 9.4-13.3 mm wide; epicarp brown to black, stigmatic scar plain; endocarp ellipsoid, 9.1-11.8 mm long, 6.8-8.6 mm dorsiventral thickness, and 7.1-9.1 mm wide; seed dorsiventrally compressed ellipsoid, 7.4-10.1 mm long, 5.3-7 mm dorsiventral thickness, and 5.9-7.8 mm wide; raphe circular. Eophyll linear-lanceolate, 19-23.3 cm long and 1.6-2.2 cm wide, exstipitate, weakly costate.
    [PW]
    Use
    Leaves and leaf-sheaths are used for thatch and siding; fruits are used as hog feed.

    Images

    Distribution

    Native to:

    Dominican Republic, Haiti, Leeward Is., Puerto Rico

    Roystonea borinquena O.F.Cook appears in other Kew resources:

    First published in Bull. Torrey Bot. Club 28: 552 (1901)

    Accepted by

    • Acevedo-Rodríguez, P. & Strong, M.T. (2005). Monocotyledons and Gymnosperms of Puerto Rico and the Virgin Islands Contributions from the United States National Herbarium 52: 1-415.
    • Govaerts, R. & Dransfield, J. (2005). World Checklist of Palms: 1-223. The Board of Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Palmweb - Palms of the World Online
    • Zona, S. 1996. Roystonea.(Arecaceae: Arecoideae). Flora Neotropica Monograph 71, 1-35.

    Sources

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Neotropikey
    Milliken, W., Klitgard, B. and Baracat, A. (2009 onwards), Neotropikey - Interactive key and information resources for flowering plants of the Neotropics.
    http://creativecommons.org/licenses/by/3.0

    Palmweb - Palms of the World Online
    Palmweb 2011. Palmweb: Palms of the World Online. Published on the internet http://www.palmweb.org. Accessed on 21/04/2013
    Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License http://creativecommons.org/licenses/by-nc-sa/3.0