MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



15 



Dalibarda with Rubeae, through Chamaerhodos and Alchemilla, with Sanguisorbeae, 

 etc. The relation of the tribes of ROSACEAE may be represented in the following 

 diagram : 



SAXIFRAGACEAE. 



POMACEAE. 



DRUPACEAE. 



Spiraeeae. 



Cbrcocarpeae. 



Roseae. 



Djryadeae. 

 (Waldsteinia.) 



Rubeae. 

 (Dalibarda.) 



Sanguisorbeae. 

 {Alchemilla.) 



Potentilleae. 



RANUNCULACEAE. 



LIMITATION OF GENERA. 



As stated before, Comarum, Sibbaldia, Horkelia and Ivesia have been included in 

 Potentilla by Bentham and Hooker, Baillon, Greene and others. The only logical course 

 to be taken would have been to include also Duchesnea and Fragaria. The latter differs 



