1366 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



Stamens included; corolla lobes short, rounded 1. E. coulteri. 



Stamens exserted; corolla lobes linear or oblong. 



Flowers solitary in the leaf axils; corolla tube 3 to 5 cm. long,. 2. E. caribaeum. 

 Flowers in terminal many-flowered cymes; corolla tube 6 to 10 mm. long. 

 Corlla tube 8 to 10 mm. long; calyx sparsely puberulent. 



3. E. mexicanum. 

 Corolla tube 6 mm. long; calyx densely puberulent 4. E. indutum. 



1. Exostema coulteri Hook, f.; Hemsl. Diag. PI. Mex. 32. 1879. 

 Type from Zimapdn, Hidalgo. 



Glabrous shrub; leaves petiolate, ovate-oblong, 5 to 6 cm. long, acuminate, 

 cuneate at base, coriaceous; flowers in terminal few-flowered corymbose cymes; 

 corolla 12 to 16 mm. long; capsule 4 to 6 mm. long. 



2. Exostema caribaeuta (Jacq.) Roem. & Schult. Syst. Veg. 5: 19. 1819. 

 Cinchona caribaea Jacq. Enum. PI. Carib. 16. 1760. 



San Luis Potosf to Colima, Guerrero, and Yucatdn. Southern Florida; West 

 Indies and Central America. 



Shrub or tree, sometimes 8 meters high; leaves petiolate, ovate to elliptic- 

 oblong, 5 to 11 cm. long, acuminate, obtuse or acute at base, barbate beneath 

 in the axils of the nerves, elsewhere glabrous; flowers pedicellate; corolla white, 

 the lobes linear, recurved, about as long as the tube; capsule 1 to 1.5 em. long; 

 wood hard, strong, close-grained, brown with yellow streaks, its specific gravity 

 about 0.93. "Sabac-ch6" (Yucatdn, Maya); "falsa quina" (Ramirez); "cuero de 

 sapo," "lechesillo" (Porto Rico); "macagua de costa," "cerillo," "'cera amarilla" 

 (Cuba). 



Known in the Bahamas as "princewood." The wood is reported to be useful 

 for cabinet work and turning, and is sometimes employed for torches. In former 

 times the bark was much used as a febrifuge in place of Cinchona bark. It is 

 said also to have emetic properties. 



3. Exostema mexicanum A. Gray, Proc. Amer. Acad. 5: 180. 1861. 



San Luis Potosf and Veracruz; type collected near Tantoyuca, Veracruz. 



Small tree; leaves short-petiolate, ovate or oval, 4.5 to 15 cm. long, abruptly- 

 acuminate, obtuse or rounded at base; barbate beneath along the costa, elsewhere 

 glabrous; coroUa sparsely villosulous, the lobes 1 cm. long. 



4. Exostema indutum Standi. N. Amer. Fl. 32: 126. 1921. 

 Tj^pe from Oaxaca. 



Leaves short-petiolate, ovate or elliptic-oblong, 5.5 to 9 cm. long, abruptly 

 acuminate, obtuse or acute at base, appressed-pilose or glabrate beneath; corolla 

 yellow, puberulent or pilosulous, the lobes 7 to 9 mm. long. 



DOUBTFUL SPECIES. 

 Exostema canescens Bartl.; DC. Prodr. 4: 359. 1830. Type from some- 

 where in Mexico. Probably not of this genus. 



14. COUTAREA Aubl. PI. Guian. 1: 314. 1775. 



Reference: Standley, N. Amer. Fl. 32: 126-128. 1921. 



Trees or shrubs; leaves petiolate; flowers large, terminal or axillary, solitary 

 or cymose; calyx tube obovoid-turbinate, the limb 5 to 8-lobate; corolla funnel- 

 form-campanulate, more or less oblique, the tube often curved and ventricose, 

 the limb 5 to 8-lobate, the lobes short, plicate-imbricate or contorted; capsule 

 more or less obcompressed, 2-celled, loculicidally bivalvate; seeds numerous,, 

 broadly winged. 



Corolla 8-lobate, sj'mmetric; calyx lobes usually 8. Capsule only slightly 

 compressed; pedicels ebracteolate 1. C. octomera. 



