154 BOTANICAL GAZETTE [SEPTEMBER 
Plants of the 
Aster CRETACEOUS --- 
EOCENE ----- 
MIDEENE = -~-- 
according to Schimper 
100 sp. 
ll te, 
TOOT 
Peru TTT 
aerecacnnsassesseneaa> sh 
Opn cesscessanseanas-siQeeenl: 
“Tose eeesSSG SSR EGRE «Bf 
Fig. 2. Diagrammatic comparison of the Cretaceous, Eocene, and Miocene dico- 
tyledonous floras. The widths of the triangles indicate the number of species. 
