222 Annals of the Carnegie Museum. 



Family APOCYNACE^. 



Key to the Species Enumerated. 



Leaves in whorls of four, unequal in size , . 558. Rauwolfia heterophylla. 



Leaves alternate, linear-oblong with rounded or emarginate apex, and up to 25 cm. 



long; clubby shrubs 556. Plumiera emarginala. 



Leaves opposite. 



Branches rather densely hairy; corolla yellow, about 4 cm. long. 



566. Urechites lutea. 

 Branches glabrous or almost so. 



Flowers numerous in dense corymbiform clusters. 



567. Forsteronia corymbosa. 

 Flowers not in dense corymbiform clusters. 



Corolla-tube not more than one cm. long; leaves narrowly oblong, 1.5-3 



cm. long, retuse. 559. Cameraria retusa. 



Corolla-tube more than one cm. long. 



Upper part of corolla-tube conspicuously enlarged into a campanulate 

 portion. 

 Calyx-lobes ovate or oblong; petioles 5-15 mm. long; leaves 

 distinctly mucronate. 

 Calyx-lobes one-half to one-fourth the length of the narrow 



part of corolla-tube 562. Rhahdadenia paludosa. 



Calyx-lobes less than one-fourth the length of narrow part of 



corolla-tube 563. Rhabdadenia bifiora. 



Cal3Tc-lobes lance-acute or acuminate, 2-3 mm. long. 



J 564. Rhabdadenia Sagrai. 

 |_565. Rhabdadenia cubensis. 

 Corolla-tube not much enlarged below the limb. 



Corolla green or white; leaves ovate to oval, 4-9 cm. long. 



561. Echites umbellata. 

 Corolla reddish or rose-color; leaves rounded to narrowly oblong, 



rarely i cm. in width 560. Echites myrtifolia. 



Corolla reddish; leaves oblong-spatulate, up to 6 cm. long and 

 2 cm. wide 557. Rauwolfia cubana. 



556. Plumiera emarginata Grisebach. 

 Plumiera emarginala Grisebach, Catalogus Plantarum Cubensium, 1866, p. 171. 



Near Nueva Gerona, June 4, 1904, A. H. Curtiss, No. 524; on rocky 

 seaward slope of ridge at Bibijagua, May 7, 1910, 0. E. Jennings, 

 No. III. General Distribution: Western Cuba and the Isle of Pines. 



On the rocky seaward face of the Bibijagua ridge, this plant, together 

 with Thrinax Wendlandiana, forms the main part of the taller vegeta- 

 tion just above the reach of the salt spray. It also is quite common 

 together with Bombax emarginatum and Agave papyrocarpa on some of 



