140 Mr. Don on the Modifications of Estivation 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 aestivation of corolla does not afford 

 any permanent distinction between those families and Rubiacece ; for in Gar- 

 denia we have the convolute aestivation of Apocynecje, and the valvate and 

 imbricate forms of CaprifoUacea; and l^aleriaiiece occur in many genera of 

 Rubiacece, and examples of each variety are to be found even in the species 

 formerly included under Cinchona; thus, for example, in the Cinchona gran- 

 dijlora and rosea of the Flora Peruviana it is imbricate, in C. lanceolata and 

 the rest of the true Cinchome it is valvate, while in the West Indian species it 

 is induplicate, and plaited in the C. excelsa of Roxburgh. 



These variations of aestivation 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. 



Cinchona sp. Auctt. 



Calyx 5-dentatus. Corolla tubulosa, limbo 5-loba, aestivatione valvata. An- 

 therce lineares, semiexsertae. Stigma bilobum. Capsula bilocularis, sep- 

 ticido-dehiscens, polysperma. Semina peltata, samaroidea, margine mem- 

 branaceo lacero. 



Arbores (Amer. Merid.) inflorescentid paniculatd. 



* Dehiscentid hasilari. Sp. normales. 

 1. C. lanceolata. Ruiz et Pavon. (Condaminea Humb. et Bonpl.) 2. cordi- 

 folia. Mutis. 3. rotundifolia. Lamb. III. Cinch. 4. ovalifolia. Humb. et 

 Bonpl. 5. purpurea. Ruiz et Pavon. 6. pubescens. Fahl. /. micrantha. 

 Ruiz et Pavon. 8. Humboldtiana. Lamb. I. c. 9. glandulifera. Ruiz et 

 Pavon. 10. hirsuta. Ruiz et Pavon. 11. stenocarpa. Lamb. I.e. 12. ca- 

 duciflora. Humb. et Bonpl. 



** Dehiscentid temiinali. Sp. aberrantes. 

 13. macrocarpa. Fahl. 14. oblongifolia. Mutis. 15. magnifolia. Ruiz et Pa- 

 von. 16. Pavonii. Lamb. I. c. I7. acutifolia. Ruiz et Pavon. 



