62 



BOTANICAL GAZETTE 



[JULY 



become extinct after the close of the Cretaceous, it is very prob- 

 able that the ancestors of the modern tree still flourished, and 

 we can only blame the imperfect geological record for the lack 



Cotyledon or Magnolia-like, simple, elongated form 



Liriodendropsis angustifolia 



L. alafum 



L. simplex 

 L. pnmaevum 



Liriophyllum popuioides 



eekii 



L, Beckwithii 



L. semialatum 



L.^uccedens 



L. LaramTense 



L. oblongifolium 



L. giga'nteum 



L. quercifolium 



var cruciforme 



L. pinnatifidum 



L. intermedium 



L. Snowii 



L. Procaccinii 



L. acuminatum 



var 



atum 



L. Tufipifera 



of evidence of their existence. It would seem that the numerous 

 Tertiary lakes would have furnished abundant facilities for fos- 

 silizing leaves from the trees that skirted their shores, or were 

 brought down from the adjacent uplands by the many streams. 



