140 Mr. Don on the Modifications of ZEstivation observable in 
style. All these families agree in having for the most part opposite and per- 
fectly entire leaves. 
As has already been remarked, the estivation of corolla does not afford 
any permanent distinction between those families and Rubiacee ; for in Gar- 
denia we have the convolute estivation of Apocynew, and the valvate and 
imbricate forms of Caprifoliacee and Valerianee occur in many genera of 
Rubiacew, and examples of each variety are to be found even in the species 
formerly included under Cinchona; thus, for example, in the Cinchona gran- 
diflora and rosea of the Flora Peruviana it is imbricate, in C. lanceolata and 
the rest of the true Cinchone it is valvate, while in the West Indian species it 
is induplicate, and plaited in the C. excelsa of Roxburgh. 
These variations of zstivation being found connected with other differences 
in structure, appear fully sufficient to entitle the abovementioned species to be 
regarded as constituting the types of so many distinct genera, the characters 
of which I shall now proceed to give. 
CINCHONA. 
CiNcHONX sP. Auctt. 
Calyx 5-dentatus. Corolla tubulosa, limbo 5-loba, zstivatione valvatà. An- 
there lineares, semiexsertze. Stigma bilobum. Capsula bilocularis, sep- 
ticido-dehiscens, polysperma. Semina peltata, samaroidea, margine mem- 
branaceo lacero. . : 
Arbores (Amer. Merid.) inflorescentid paniculata. 
* Dehiscentiá basilari. Sp. normales. 
1. C. lanceolata. Ruiz et Pavon. (Condaminea Humb. et Bonpl.) 2. cordi- 
folia. Mutis. 3. rotundifolia. Lamb. Ill. Cinch. 4. ovalifolia. Humb. et 
Bonpl. 5. purpurea. Ruiz et Pavon. 6. pubescens. Vahl. 7. micrantha. 
Ruiz et Pavon. 8. Humboldtiana. Lamb. Lc. 9. glandulifera. Ruiz et 
Pavon. 10. hirsuta. Ruiz et Pavon. 11. stenocarpa. Lamb. l.c. 12. ca- 
duciflora. Humb. et Bonpl. 
** Dehiscentiá terminali. Sp. aberrantes. 
13. macrocarpa. Vahl. 14. oblongifolia. Mutis. 15. magnifolia. Ruiz et Pa- 
von. 16. Pavonii. Lamb. l.c. 17. acutifolia. Ruiz et Pavon. 
