44 



tributions from the National Herbarium (issued July 

 31, 1901), and later (October, 1901), was reissued as a 

 report from the Alabama Geological Survey. After 

 midsummer of 1897 Dr. Mohr became so occupied in the 

 preparation of the manuscript for this great work that 

 at his request the sending of plants was discontinued, 

 except as he occasionally asked for material in some spe- 

 cial group. The later collections have been determined by 

 Dr. J. K. Small, Mr. G. V. Nash, Dr. Edward L. Greene 

 and other specialists, and by the writer^ who has recently 

 had an opportunity to compare some of the more doubt- 

 ful material with the rich collections in the herbarium 

 of the New York Botanical Garden. Some fifty species 

 are reported by Dr. Mohr of our collecting that are not 

 represented in the harbarium of the Polytechnic Insti- 

 tute ; or at least are not represented under the name by 

 which Dr. . Mohr reports them. These si^ecies are in- 

 cluded in this list, Dr. Mohr being cited in each case as 

 the authority. These specimens will be found either in 

 the herbarium of Alabama plants deposited by Dr. 

 Mohr at the State University at Tuscaloosa, or in his 

 private herbarium, which is now incorporated with the 

 National Herbarium at Washington. In part, at least, 

 these species represent uniques that did not chance to 

 be again collected by us. There are, however, too many 

 to be wholly accounted for in this way, and it seems 

 probable that some of them represent cases where Dr. 

 Mohr found occasion to change his original determina- 

 tion of the specimens. It has not been possible to trace 

 these cases, for since the publication of Dr. Mohr's 

 Avork I have not had access to the collections. It has 

 seemed best to include these names, but with this word 

 of Avarning as to the possibility of error through includ- 

 ing two determinations for the same plant. 



