Roystonea maisiana

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Roystonea (roy-ston-EH-ah)
maisiana (MY-see-ahn-ah)
3andrew.jpg
Fairchild Botanical Gardens, Coral Gables FL. Photos by Andrew.
Scientific Classification
Genus: Roystonea (roy-ston-EH-ah)
Species:
maisiana (MY-see-ahn-ah)
Synonyms
None set.
Native Continent
America
America.gif
Morphology
Habit: Solitary
Leaf type: Pinnate
Culture
Survivability index
Common names
Palma negra.

Habitat and Distribution

Roystonea maisiana is endemic to the Maisí region of the province of Guantánamo,
Fairchild Botanical Gardens, Coral Gables FL. Photos by Andrew.
eastern Cuba, at 350-420 meters altitude.

Description

"Roystonea maisiana, is a large palm which reaches heights of 20 metres (66 ft.). Stems are grey-white, and are usually 26–50 centimetres (10–20 in.), sometimes up to 51 centimetres (20 in.), in diameter. The upper portion of the stem is encircled by leaf sheaths, forming a smooth green portion, known as the crownshaft (extended petiole), which is normally 1.5 m. (4.9 ft.) long. The crown holds about 15 leaves with 4.8-metre (16 ft.) rachises. The 0.8–1.1 m. (2.6–3.6 ft.) inflorescences bear white, male and female flowers (monoecious). Fruit are 10–13.7 millimetres (0.39–0.54 in.) long and 7.5–9.5 mm. (0.30–0.37 in.) wide, and black when ripe."

Trunk gray-white, to 20 m. tall , 26-40(-51) cm. in diam. Leaves about 15, lowest leaves hanging below the horizontal; crownshaft about 1.5 m. long; rachis ca. 4.8 m. long; middle segments 106-118 cm. long and 4.2-4.9 cm. wide. Inflorescence 0.8-1.1 m. long and about 1 m. wide; prophyll and peduncular bract not seen; rachillae 20-24 cm. long and 1.2-2.1 mm in diam. Staminate flowers white, sepals triangular, 1-1.4 mm. long and 1.3-1.5 mm. wide; petals elliptical to ovate, 4.2- 5.7 mm. long and 2,5- 2.9 mm. wide; stamens 6, 3.7-6.5 mm long, filaments awl-shaped, 2.4-4.4 mm long, anthers 2.5-4.2 mm long; pistillode minute. Pistillate flowers white, 2-3.5 per cm.; sepals reniform, 1.3- 1.7 mm. long, and 2.5-3.5 mm. wide; petals ovate, 2.7-3.5 mm. long; staminode 6-lobed, 2.1- 2.3 mm. long, free for 0.7-1 mm.; gynoecium 2.3-2.6 mm. long, and 1.7-2.2 mm in diam. Fruits ellipsoid, gibbous, 10-13.7 mm. long, 7.9-9.2 mm. dorsiventral thickness, and 7.5-9.5 mm. wide; epicarp black, stigmatic scar plain; endocarp ellipsoid, 8.8-10.3 mm. long, 5.9-7.4 mm. dorsiventral thickness, and 5.8-7.4 mm. wide; seed ellipsoid, 7.6-10 mm. long, 4.6-5.9 mm. dorsiventral thickness, and 5.2-6.8 mm. wide; raphe circular. Eophyll linear-lanceolate, 12-15 cm. long and 1.2-2.2 cm. wide, stipitate, short costate. (Zona S.)/Palmweb. Editing by edric.

Culture

Same requirements as R. regia.

Curiosities

"While at Fairchild Tropical Gardens (FTG), I noticed in the small grove of about six or so R. Maisianas, two of them had a burnt orange tomentum on the crownshaft(causing it to appear red, from a distance). I wasn't sure what it was, but after inspection of all the trees, there was indeed a red powdery-ness on two of them. I was wondering why only two of the six or so trees had it. Maybe this red tomentum is worn off as the crownshaft ages? Maybe the crownshaft grows this redness as it matures..? I consulted Dr. Scott Zona about this red tomentum and he was unaware of it. From the literature I have read, this palm's distinguishing features are a longer petiole(I noticed this), as well as a trunk that usually never tapers--I noticed this as well. What I also noticed(not in the books)is the huge crownshaft. My readings say 4', but they are more like 6 1/2-8' tall(the crownshaft was way taller than me). A rare and unique royal--these photos show, that the palm goes through varying stages of color... " (Andrew Street)

Uses: This palm is used, as other species are in eastern Cuba, for timber, thatch, and hog feed.



External Links

http://perfildaplanta.blogspot.com/2010/07/roystoneas-confusoes-imperiais-parte-ii.html

References

Phonetic spelling of Latin names by edric.

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

Special thanks to Palmweb.org, 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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