Part 2, 1921] RUBIACEAE 119 



minute; hypanthium oblong, 3-4 mm. long, glabrous; calyx-lobes 4, minute, 0.5 mm. long or 



shorter, deltoid, acute; corolla 1.5-2 cm. long, glabrous outside, the 4 lobes linear, 6-9 mm. 



long; stamens 4, exserted, the anthers about 4 mm. long; capsule oval-oblong, 8-12 mm. long, 



dark-brown, smooth, lustrous. 



Type locality: Santo Domingo. 



Distribution: Eastern Cuba and Hispaniola. 



Illustrations: Obs. Phys. 3 7: pi. 2; Lamb. Descr. Cinchona pi. 13. 



3. Exostema stenophyllum Britton, Bull. Torrey Club 42: 

 517. 1915. 



Shrub, 2 meters high or less, glabrous throughout, the branches stout, brownish, densely 

 leafy; stipules 1-2 mm. long, the lobes deltoid, obtuse; leaves sessile, linear-oblanceolate, 

 2-6 cm. long, 3-6 mm. wide, attenuate at the base, slightly narrowed to the obtuse apex, thick- 

 coriaceous, bright-green, the costa slender, impressed above, prominulous beneath, the lateral 

 veins obsolete, the margin subrevolute; flowers terminal, solitary, the pedicels very stout, 

 1-1.5 cm. long; hypanthium 6-7 mm. long, oblong-cylindric; calyx-lobes 5, triangular-subulate, 

 2.5-3.5 mm. long; corolla white, the tube about 14 cm. long, 1.5 mm. thick, the 5 lobes linear, 

 2-3 cm. long"; anthers linear, about 1.8 cm. long, the filaments of about the same length; 

 capsule oblong-obovoid, 1.5-2.2 cm. long, 8 mm. thick, nearly smooth, shallowly bisulcate. 



Type locality: Among rocks at the water's edge, Rio Guayabo, above the falls, Oriente, Cuba, 

 at an altitude of 450 to 550 meters. 



Distribution: Known only from the type locality. 



4. Exostema longiflorum (Lamb.) R. & S. Syst. Veg. 5: 18. 



1819. 



Cinchona longiflora Lamb. Descr. Cinchona 38. 1797. 



Shrub, 1-2 meters high, the branches stout or slender, gray or brownish, puberulent or 



villosulous when young, usually densely leafy; stipules oblong or lanceolate, 2.5-6 mm. long, 



acuminate or attenuate, thin, green, puberulent; petioles slender or stout, 3-12 mm. long, 



rarely wanting; leaf-blades linear-lanceolate, very narrowly lance-elliptic, or oblanceolate, 



5-11 cm. long, 0.8-2.5 cm. wide, long-attenuate at the base, usually long-attenuate to the 



acutish apex, membranaceous, bright-green, sparsely white-pilose beneath in the axils of the 



chief veins, elsewhere glabrous, the costa impressed above, prominent beneath, the lateral 



veins evident, few, distant, ascending, the margin usually plane; flowers axillary and solitary 



or 1-3 at the ends of the branches, the pedicels stout, shorter than the calyx; hypanthium 



cylindric, 6-8 mm. long, glabrous; calyx-lobes 5, linear-subulate, 3-6 mm. long; corolla white 



or pink, glabrous, the tube 12-14 cm. long, 2-2.5 mm. thick, curved, the 5 lobes linear, 4-5 cm. 



long, recurved; stamens exserted, the anthers linear, about 2 cm. long; capsule oval-ellipsoid, 



about 1.5 cm. long, coarsely costate, the valves about 8 mm. wide after dehiscence. 



Type locality: Given as Guiana [an error for Santo Domingo]. 

 Distribution: Along streams, Cuba and Hispaniola. 

 Illustration: Lamb. Descr. Cinchona pi. 12. 



5. Exostema salicifolium Griseb. Cat. PI. Cub. 125. 1866. 



Shrub, 3 meters high, glabrous throughout, the branches very slender, grayish, the in- 

 ternodes about 1 cm. long; stipules about 1 mm. long, deltoid, acute, thick; petioles 1.5 mm. 

 long or shorter; leaf-blades oblong-oblanceolate or narrowly elliptic-oblong, 3-4 cm. long, 

 0.7-1.1 cm. wide, acute or attenuate at the base, slightly narrowed to the obtuse apex, sub- 

 coriaceous, lustrous above, slightly paler beneath, the costa prominent on both surfaces, the 

 lateral veins mostly obsolete; flowers axillary, solitary, the pedicels very slender, 1-1.8 cm. 

 long; hypanthium 3-4 mm. long, oval-elliptic; calyx-lobes minute, nearly obsolete; corolla 

 purplish outside, white within, the tube 2 cm. long, the 5 lobes linear, about as long as the 

 tube; stamens exserted, the anthers 1.4 cm. long; capsule ellipsoid, 1.2-1.8 cm. long, obscurely 

 costate, the valves after dehiscence flat, 6-9 mm. wide. 



Type locality: [Toscano] western Cuba. 

 Distribution: Known only from the type locality. 



