Jennings: Contribution to Botany of Isle of Pines. 83 



173. Selena gracilis Elliott. 

 Scleria gracilis Elliott, Sketch of the Botany of South Carolina and Georgia, 11. 



1824, p. 571. 



Reported in Britton, Studies of West Indian Plants, VIII, Bulle- 

 tin of the Torrey Botanical Club, XLIII, 1916, p. 443, as follows: 

 "Southeastern United States, Pinar del Rio, and Isle of Pines, Cuba." 



174. Lagenocarpus guianensis Nees. 



Lagenocarpus guianensis Nees, Linnaea, IX, 1834, p. 304. 



Scleria guianensis Steudel, Synopsis plantarum Glumacearum, 1855, p. 177. 



On the white sand of the pine-barrens at Los Indios, May 17, 

 1 910, 0. E. Jennings, No. 32/. General Distribution: Bahamas, 

 Isle of Pines, Trinidad, Guiana, and Brazil. (Clarke.) 



A slender stiffly erect light green sedge reaching the height of five 



feet or more, with slender brownish inflorescences of a foot or more 



in length. The plants arise from tuberous-thickened portions of a 



scaly rhizome which creeps along, just beneath the surface of the 



sand, the tuberous thickenings being two or three inches apart along 



the rhizome. 



Family PALM^. 



Key to the Species Enumerated. 

 Leaves fan-shaped. 

 Petioles smooth. 



Leaves large, usually five or six feet across, the petiole extending about 



half-way up the blade 180. Sabal parviflora. 



Leaves smaller or else the petiole not extending far up the blade. 



Leaves small, about one to two feet across, stifif ; trunk very slender and 



pole-like; habitat inland 178. Coccothrinax Miraguano. 



Leaves medium-sized, rather thin, the cross-veinlets prominent; trunk 



moderately thick; habitat coastal 176 Thrinax Wendlandiana. 



Leaves fairly large, up to five or six feet across; stifif; cross-veinlets not 



prominent I75- Colpothrinax Wrightii. 



Petioles armed. 



Leaves large; petioles 2 cm. in width (or more); cross-veinlets distinct; 



flowers white-tomentose i79- Copernicia Curtissii. 



Leaves of moderate size; petioles about i cm. in width; cross-veinlets in- 

 distinct; flowers glabrous 177- Accelorraphe Wrightii. 



Leaves pinnate. 



Tall stately trees with whitish massive stems, usually enlarged near the middle 

 and terminating in long green cylinders formed by the closely packed leaf 



sheaths; fruit bluish, about 1-1.5 cm. long 182. Roystonea regia. 



Tall stately trees with the base usually enlarged; petioles clasping the stem 

 but not forming a prominent cylinder; fruit large (the ordinary cocoanut). 



183. Cocos nucifera. 



