Roystonea dunlapiana

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Roystonea (roy-ston-EH-ah)
dunlapiana (duhn-lahp'-ee-AHN-ah)
Estuary of Rio Garcia, Honduras. Sep 1992. from slide. Photo by Dr. Scott Zona.
Scientific Classification
Genus: Roystonea (roy-ston-EH-ah)
dunlapiana (duhn-lahp'-ee-AHN-ah)
None set.
Native Continent
Habit: Solitary
Leaf type: Pinnate
Survivability index
Common names
Yagua, cabiche (Honduras).

Habitat and Distribution

Roystonea dunlapiana is found in; Honduras, Mexico Southeast, and Nicaragua.
Estuary of Rio Garcia, Honduras. Photo by Dr. Scott Zona.
A palm of humid forest in the Atlantic lowlands, scattered in estuaries and coastal swamps from Mexico to Honduras and Nicaragua. It likely occurs in Belize, but no collections from that country have been seen.


Trunk gray-white, to 20 m tall, about 38 cm in diam. Leaves about 15, lowest leaves hanging below the horizontal; crownshaft about 2 m long; rachis about 4 m long, middle segments 78-88 cm long and 2.5-6.5 cm wide. Inflorescence about 1 m long and 1 m wide; pro-phyll not seen; peduncular bract about 2 m long, narrowly acuminate, as long as the crownshaft, widest in the middle; rachillae about 37 cm long and 1-1.3 mm in diam., stiff. Staminate flowers white; sepals triangular, about 1 mm long and 0.8-1.8 mm wide; petals elliptical to ovate, 2.9-5.6 mm long and 2.1-2.4 mm wide; stamens 6, about 3.5 mm long; filaments awl-shaped, 2.4-4.8 mm long; anthers 1.8-2.7 mm long, purplish; pistillode minute. Pistillate flowers 1.5-3.5 per cm, not seen. Fruits obovoid and gibbous, 12-14.7 mm long, 7.5-9.8 mm dorsiventral thickness, and 7.1-9.5 mm wide; epicarp purplish black stigmatic scar plain; endocarp ellipsoid, 11-13.6 mm long, 6.5-8.2 mm dorsiventral thickness, and 6.5-7.4 mm wide; seed ellipsoid, 7.3-10.3 mm long, 4.5-5.8 mm dorsiventral thickness, and 5.1-6 mm wide; raphe circular. Eophyll linear-lanceolate, exstipitate, weakly costate. (Zona S.)/Palmweb. Editing by edric.


Much the same as for other Royals. Cold Hardiness Zone: 10a

Comments and Curiosities

Uses: Leaves and leaf sheaths are used for thatching, and The wood is used for construction.

Conservation: IUCN Red List of Threatened Species 1998: Endangered B1+2c ver 2.3 - Occurs in Honduras where it is considered to be Endangered, also recorded in south-east Mexico.

External Links


Phonetic spelling of Latin names by edric.

Special thanks to Geoff Stein, (Palmbob) for his hundreds of photos.

Special thanks to, Dr. John Dransfield, Dr. Bill Baker & team, for their volumes of information and photos.

Glossary of Palm Terms; Based on the glossary in Dransfield, J., N.W. Uhl, C.B. Asmussen-Lange, W.J. Baker, M.M. Harley & C.E. Lewis. 2008. Genera Palmarum - Evolution and Classification of the Palms. Royal Botanic Gardens, Kew. All images copyright of the artists and photographers (see images for credits).

Zona S.Roystonea.(Arecaceae: Arecoideae).

Many Special Thanks to Ed Vaile for his long hours of tireless editing and numerous contributions.

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