Part 2, 1921] RUBIACEAE 121 



9. Exostema angustifolium (Sw.) R. & S. Syst. Veg. 5: 19. IS 19. 



Cinchona angustifolia Sw. Sv. Vet.-Akad. Nya Handl. 8: 119. 1787. 



Branchlets grayish, puberulcnt when young, the internodes elongate; stipules deltoid, 

 acute; petioles short, stout, puberulent; leaf-blades usually large, linear-lanceolate, obtuse 

 or acute at the base, long-attenuate to the apex, puberulent beneath, the lateral veins con- 

 spicuous, ascending; inflorescence terminal, corymbose, broad, many-flowered, the pedicels 

 equaling or longer than the calyx, puberulent; hypanthium villosulous, 2 mm. long, turbinate; 

 calyx-lobes 5, subulate, as long as the hypanthium or longer; corolla large, glabrous, the tube 

 slender, elongate, the 5 lobes linear, spreading or recurved, about half as long as the tube; 

 anthers linear, elongate; capsule oblong, angulate. 



Type locality: Santo Domingo. 



Distribution: Hispaniola. 



Illustrations: Sv. Vet.-Akad. Nya Handl. 8: pi. 3; Lamb. Descr. Cinchona pi. 9. 



10. Exostema lineatum (Vahl) R. & S. Syst. Veg. 5: 18. 1819. 



Cinchona lineata Vahl, Skr. Nat.-Selsk. Kj0b. I 1 : 22. 1790. 

 Exostema Picardae Krug & Urban; Urban, Symb. Ant. 1: 422. 1899. 



Branches grayish or purplish, puberulent when young, the internodes elongate; stipules 



ovate-triangular; petioles 1-2 mm. long; leaf-blades ovate or ovate-oblong, 4-6 cm. long, 



1.5-2.5 cm. wide, obtuse or rounded at the base, subabruptly acuminate or attenuate to the 



obtuse apex, subcoriaceous, bright-green above, dull, glabrous, the venation impressed, 



minutely pilosulous along the veins; inflorescence terminal and axillary, corymbose, broad, 



many-flowered, the pedicels 5-9 mm. long; hypanthium 3.5-4 mm. long, glabrous, oblong; 



calyx-lobes 5, linear, obtuse, equaling the hypanthium; corolla 3-3.5 cm. long, glabrous, the 



tube 1.5 mm. thick, the lobes linear, obtuse, about equaling the tube; stamens exserted, the 



anthers 8-10 mm. long; capsule oblong-cylindric, 1.2-1.5 cm. long, 3.5-4 mm. thick; seeds 



narrowly winged. 



Type locality: Santo Domingo. 



Distribution: Hispaniola. 



Illustrations: Skr. Nat.-Selsk. Kj0b. I 1 : pi. 4; Lamb. Descr. Cinchona pi. 6. 



1 1 . Exostema subcordatum Krug & Urban ; Urban (Ber. Deuts. 



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

 Symb. Ant. 1: 422. 1899. 



Shrub, 2-3 meters high, the branches stout, grayish, minutely puberulent or glabrous, the 

 internodes usually elongate; petioles stout, 1-3 mm. long; leaf-blades ovate or ovate-oblong, 

 4.5-7 cm. long, 2-4 cm. wide, subcordate or broadly rounded at the base, subabruptly long- or 

 short-acuminate at the apex, subcoriaceous, bright-green above, sublustrous, glabrous, the 

 venation subimpressed, slightly paler beneath, sparsely pilosulous along the veins or glabrous, 

 the lateral veins prominent, distant, arcuate, the margin plane or subrevolute; inflorescence 

 terminal, corymbose, 10-12 cm. broad, many-flowered, the pedicels slender, 5-10 mm. long; 

 hypanthium 3-5 mm. long, glabrous, obovoid-oblong ; calyx-lobes 5, linear, obtuse, about as 

 long as the hypanthium; corolla glabrous, 4.2-5 cm. long, the tube 1.5 mm. thick, the lobes 

 linear, obtuse, recurved, equaling or slightly longer than the tube; stamens exserted, the 

 anthers 10-12 mm. long; capsule obovoid or obovoid-oblong, 5-8 mm. long, 3.5-4 mm. thick; 

 seeds about 1 mm. long, suborbicular, narrowly winged. 



Type locality: Rocky thickets of the mountains above La Riviere Froide, Haiti. 



Distribution: Haiti. 



12. Exostema triflorum (Wright) G. Don, Gen. Hist. 3: 481. 



1834. 



Cinchona tri flora Wright, London Med. Jour. 8: 240. 1787. 



Exostema ellipticum triflorum Maza, Anal. Soc. Esp. Hist. Nat. 23: 286. 1894. 



Glabrous throughout; petioles S mm. long; leaf-blades lance-oblong, 5-7.5 cm. long, obtuse 



or acutish at the base, acuminate or long-acuminate at the apex, membranaceous, lustrous 



above, the costa subimpressed, sublustrous beneath, sometimes short-pilose in the axils of the 



