228 Annals of the Carnegie Museum. 



575. Marsdenia clausa Robert Brown. 



Marsdenia clausa Robert Brown, Memoirs of the Wernerian Society of Natural 



History, Edinburgh, I, 1809, p. 30. 

 Marsdenia agglo?nerata Decaisne, in DeCandolle, Prodromus Systematis Naturalis 



Regni Vegetabilis, VIII, 1844, p. 615. 

 Marsdenia picla Decaisne, /. c, excluding synonyms. 

 Marsdenia clausa Grisebach, in part, Flora of the British West Indian Islands, 



1861, p. 422. 



Between Bogarona and Caleta Grande, "South Coast," May 22, 

 1910, 0. E. Jennings, No. 487. General Distribution: Cuba, the 

 Isle of Pines, and Hispaniola. 



A vine in the hardwood jungle. Flowers pink inside. 



576. Marsdenia umbellata Grisebach. 



Marsdenia umbellata Grisebach, Catalogus Plantarum Cubensium, 1866, p. 178. 

 Northern part of the island, Blain, No. 118 (Millspaugh). General 

 Distribution: Cuba and the Isle of Pines. 



Family CUSCUTACE^. 

 577. Cuscuta americana Linnaeus. 



Cuscuta americana Linn^us, Species Plantarum, 1753, p. 124; Grisebach, Flora 

 of the British West Indian Islands, 1861, p. 476. 



"Over weeds on the margin of an old clearing at Pedernales Point' 



Isle of Pines (1439)," February 16, 1899 (Millspaugh). General 



Distribution: The Bahamas, West Indies, and tropical continental 



America. 



Family CONVOLVULACE^. 



Key to the Species Enumerated. 



Styles distinct, each two-parted; corolla white or blue, more or less rotate. 



Shaggy-pubescent with long silky hairs 579. Evolvulus Wrightii. 



Closely appressed-pubescent. 



Leaves acute, linear to narrowly oblong 578. Evolvulus sericeus. 



Leaves mostly obtuse or rounded, ovate to elliptic. .580. Evolvulus arenicola. 

 Styles united up to th.- stigma. 

 Stigma not distinctly flattened. 



Stamens protruding during the expansion of the limb of the corolla (Exo- 

 gonium). 



Inflorescence with conspicuous bracts 582. Exogonium Wrightii. 



Inflorescence without bracts. 



Leaf-blades silvery-canescent beneath. 



583. Exogonium argentifolium. 

 Leaf-blades neither silvery nor sericeous beneath. 



581. Exogonium microdactylum. 



