186 STUDIES IN GEOLOGY, No. 4 



UNDETERMINED 



PLATE VIII Fig. 2 



The fragment figured lacks diagnostic characters but it 

 seems desirable to include it from among the many fragments 

 that have been ignored in the present account of this flora, 

 since it apparently represents a leaflet of a pinnate form that 

 suggests either Sapindus or Cedrela. The leaflet is entire 

 margined, coriaceous in texture, markedly inequilateral and 

 conspicuously falcate-lanceolate in outline, with a sessile 

 base, stout midrib, and immersed venation. 



Species of Sapindaceae are very common in the monsoon 

 region of Bolivia, but I do not have any exact details regard- 

 ing the range of Sapindus in this region. There are num- 

 erous existing species of Sapindus, and the wide ranging Sap- 

 indus saponaria occurs alo'ng streams in the Lomas region of 

 coastal Peru and in the interandine valleys of that country. 

 In Bolivia it is recorded by Herzog from altitudes up to 

 2,275 feet in the Santa Cruz Sierras east of Cochabamba, and 

 it is also present northeast of Pisllypampa in the Rio Chi- 

 more country at low altitudes. 



The genus Cedrela (Meliaceae) comprises about ten exist- 

 ing species of large trees of the American tropics, ranging 

 from Mexico southward to eastern Peru and Brazil. It is 

 doubtless present in the existing flora of the Bolivian Yun- 

 gas, although I know of no such records, and may be repre- 

 sented by the present fossil leaflet. 



