Part 2, 1921] RUBIACEAE 123 



16. Exostema rotundatum Griseb. Mem. Am. Acad. II. 8: 504. 



1862. 



Exostema ellipticum rotundatum Maza, Anal. Soc. Ivsp. Hist. Nat. 23: 286. 1894. 



Slender tree, 6-9 meters high, glabrous throughout; petioles stout, 4-6 mm. long; leaf- 

 blades oval or rounded-oval, 5-7.5 cm. long, 3.5-4.5 cm. wide, obtuse or acutish at the baSe, 

 rounded at the apex, coriaceous, lustrous above, the costa impressed, dull beneath, the costa 

 prominent, the lateral veins inconspicuous, about 4 on each side, the margin plane or sub- 

 revolute; inflorescence terminal, corymbose, few-flowered, the pedicels 1-2 cm. long; hypan- 

 thium cylindric, 4 mm. long; calyx-lobes 5, triangular-subulate, 1.5-2 mm. long, subobtuse; 

 corolla at first greenish, becoming white, finally rose-colored or red, the tube 4-4.5 cm. long, 

 the lobes about half as long; capsule oblong-cylindric, 1.5-2.4 cm. long, 4-5 mm. thick, smooth. 



Type locality: Pine woods near Monte Verde, Oriente, Cuba. 

 Distribution: Known only from the type locality. 



17. Exostema ellipticum Griseb. Mem. Am. Acad. II. 8: 504. 



1862. 



Tree, glabrous throughout, the branches stout, brownish, the internodes short or elongate ; 



stipules sheathing, 2.5-5 mm. long, thick, brown, deciduous; petioles stout, 2-8 mm. long; 



leaf-blades oval to elliptic-oblong, 5.5-8.5 cm. long, 3-4.5 cm. wide, rounded to acutish at the 



base, rounded to acutish at the apex, sometimes broadly and obtusely short-acuminate, 



lustrous above, bright-green, the venation impressed, slightly paler beneath, the lateral veins 



prominulous, few, distant, nearly straight, the margin plane or revolute; inflorescence terminal, 



corymbose, usually few-flowered, the pedicels slender or stout, 4—20 mm. long; hypanthium 



3-3.5 mm. long; calyx-lobes 5, triangular, acute or acuminate, half as long as the hypanthium 



or shorter; corolla white, becoming rose, the tube slender, about 2.5 cm. long, the 5 lobes linear, 



recurved, about as long as the tube; stamens exserted; capsule subcylindric, 1.5-2.8 cm. long, 



4-7 mm. thick, dark-brown, obscurely costate; seeds about 6 mm. long, brown, the body 2 



mm. long, broadly winged at the ends, the wings narrow on the sides. 



Type locality: Forests near Monte Verde, Oriente, Cuba. 

 Distribution: Oriente, Cuba, and the Isle of Pines. 



18. Exostema myrtifolium Griseb. Cat. PI. Cub. 125. 1866. 



Shrub, 1-2 meters high, the internodes short; stipules deltoid, about 1 mm. long; petioles 

 stout, 1-2 mm. long; leaf -blades oval or rounded-oval, 7-12 mm. long, 4—9 mm. wide, obtuse 

 or rounded at the base, rounded at the apex, coriaceous, glabrous, lustrous above, paler be- 

 neath, the lateral veins impressed, 2 or 3 on each side, the margin revolute; inflorescence 

 terminal, cymose-corymbose, few- or many-flowered, the pedicels 2-4 mm. long; hypanthium 

 1 mm. long, puberulent; calyx-lobes 5, triangular-subulate, acute, half as long as the hypan- 

 thium; corolla white, the tube 6 mm. long, the 5 lobes half as long; stamens exserted; capsule 

 subglobose, 3-4 mm. long, brown, smooth, glabrate; seeds 1.5-2 mm. .long, brown, broadly 

 winged. 



Type locality: [Near Baracoa] Cuba. 

 Distribution: Known only from the type locality. 



19. Exostema elegans Krug & Urban; Urban, (Ber. Deuts. 



Bot. Ges. 15: 262; nomen nudum. 1897) 



Symb. Ant. 1: 423. 1899. 



Tree, 4-5 meters high, the branches stout, grayish, minutely puberulent when young, 

 the internodes short; stipules 1-2 mm. long, deltoid or subtruncate, apiculate, thick, deciduous; 

 petioles stout, 3-8 mm. long, minutely puberulent or glabrate; leaf-blades oval or oval-elliptic, 

 2.7-9 cm. long, 1.4-4 cm. wide, rounded or obtuse at the base, rounded or obtuse at the apex 

 or sometimes obtusely short-acuminate, coriaceous, lustrous above, glabrous, the venation 

 plane or impressed, paler beneath, glabrous or sparsely pilose in the axils of the veins, the lateral 

 veins obscure, the margin plane or subrevolute; inflorescence terminal and axillary, cymose- 

 corymbose, 1.5-6 cm. broad, densely many-flowered, the pedicels 1 mm. long or shorter, 



