122 



With more persistent pubescence, shorter and reduced num- 

 ber of teeth, shallower sinuses, rounded leaf bases, shorter 

 petioles (about 10 mm.), smaller leaves (about 1.5 x 5 cm.) 

 with margins 1 to 8-toothed, entire or merely crisped, this be- 

 comes var. parvilobata ; (Mueller nos. 566a, 566b, and 566c col- 

 lected August 25, 1933 in the type locality of the species). This 

 is a very variable form, grading into the type in any or all of the 

 characters by which it is differentiated. 



Series of specimens designated as co-types of the above two 

 species and variety are deposited in the following herbaria: 

 Arnold Arboretum at Jamaica Plain, Mass.; University of Illi- 

 nois at Urbana; Field Museum of Natural History at Chicago. 



The author wishes to make grateful acknowledgement of the 

 aid of Dr. Wm. Trelease who examined the material and offered 

 suggestions as to its affinities with other species and groups. 



University of Texas 



