110 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.54. 



known in the fossil state and all South American in the existing 

 flora include Rwprechtia of the Polygonaceae; Escallonia of the Saxi- 

 fragaceae; Enterolohium of the Mimosaceae; PeltopJiorum of the 

 Caesalpiniaceae ; Amicia, Drepanocarpus , AescJiynomene, Sweeiia, 

 and Platy podium of the Papilionaceae ; Porlieria of the Zygophylla- 

 ceae; Myrteola of the Myrtaceae; and CupTiea of the Lythraceae. 

 The family Combretaceae is represented both at Potosi and Corocoro 

 by the characteristic fruits of species apparently belonging to the 

 Diptera section of Terminalia — an old genus with a large number of 

 modern tropical and subtropical species and still present in eastern 

 Bolivia. In lieu of a more extended botanical analysis the reader is 

 referred to the accompanying table of fossil species with their existing 

 relatives. This, together with the facts introduced in the systematic 

 account of the fossils, will serve to complete the botanical picture and 

 also supply the pertinent facts regarding the geological history of the 

 various fossil types. 



CORRELATION. 



The number of Tertiary plants described from South America is 

 inconsiderable, so that there is no means of direct comparison between 

 the Potosi flora and other fossil floras except with those that are 

 remote geographically, and such comparisons become increasingly 

 hazardous the nearer the approach to the Recent. 



Tertiary plants have been known from southern Chile (Coronel) 

 since 1891,^ and a flora of apparently the same age is present at 

 several localities in the extreme southern part of the continent.' 

 These all appear to fall in the earlier Tertiary, De Lapparent regard- 

 ing them as Eocene (probably Sparnacian) and Dusen, following 

 Wilckens, regarding them as probably Oligocene. At the opposite 

 end of the continent Engelhardt •* has described a considerable flora 

 from Colombia (Santa Ana, Cducathale) and Ecuador (Tablayacu, 

 Loja Basin). These are simply designated as Tertiary by Engel- 

 hardt, Wolf/ and others. From certain resemblances to the flora 

 from Panama recently studied I am disposed to regard the Loja 

 coals as the same age as the plant bearing beds of Panama, which 

 are either Oligocene or early Miocene, and in any event much older 



1 Engelhardt, H., Ueber Tertiarpflanzen von Chile, Abh. Senck. Naturf. Gesell., vol. 16, Hft. 4, 1891, 

 pp. 629-692, pis. 1-14. Engelhardt, H. , Bemerkungen zu chilenischen Tertiarpflanzen. Abh. Sitz. Naturw. 

 Gesell. Isis in Dresden, 1905, pp. 69-82, pi. 1. 



' GilMnet, A., Quelques plantes fossiles des terras Magellaniques. Resultats voyage du S. Y. Bclgica en 

 1897-1899,1909. Dusen, P., Uober die tertiare Flora der Magellanslander. Svenska Exped. till Magel- 

 lanslanderna, vol. 1, 1899, pp. 87-107, pis. 8-13. 



8 Engelhardt, H., Ueber neue Tertiarpflanzen Siid-Amerikas, Abh. Senck. Naturf. Gesell., vol. 19, 1895, 

 pp. 1-47, pis. 1-9. 



* Wolf, Teodoro, Geografla y Geologia del Ecuador, 1892. Wolf, T., and Rath, G. vom, Zeits. Deutsch. 

 Geol. Gesell., vol. 28, 1876, pp. 391-393. 



