100 Rhodora [JUNE 
Ganoga Lake [Sullivan County|, June, 1898, S. Brown; Corry 
[Erie County], June 1, 1893, J. R. Churchill. 
Specimens of these collections, except the last cited, are in the 
Herbarium of the Academy of Natural Sciences and have received 
critical examination by Mr. Mackenzie. 
ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA. 
ANDROPOGON SCOPARIUS IN THE UNITED STATES AND 
CANADA. 
F. Tracy HUBBARD. 
Tue marked variability of Andropogon scoparius is known to most 
collectors and different authors have described varieties and forms 
of the species, some of which have been raised to specific rank. With 
a view to classifying these variants a careful study of the species was 
undertaken at the suggestion of Prof. M. L. Fernald who has kindly 
given me his advice on numerous points. I am also indebted to Mr. 
Bayard Long for the loan of the material in the herbarium of the 
Academy of Natural Sciences of Philadelphia and to Miss K. D. 
Kimball of the New York Botanical Garden for notes on the type of 
Andropogon littoralis. 
Many of the characters which have been used for separation of 
varieties or species do not prove constant enough, to have value in 
classification. This is the case with such features as the color of plant, 
length of sessile spikelet, villousness of sheaths and leaves, compres- 
sion of sheaths and length of hairs at the apex of the internodes of the 
rhachis. Hackel in DC. Monogr. Phan. 6: 384 (1889) describes six 
forms or subvarieties (along some of these lines) which are scarcely 
determinable except in their extreme development. The species, 
however, seems to divide into three reasonably marked varieties: the 
common widespread form with glabrous sheaths and open, elongated 
inflorescence which intergrades with the other two forms; the second 
or typical form also with an open, elongated inflorescence, described 
by Michaux FI. Bor. Am. 1: 57 (1803) “A vaginis villosis,” and thus 
at once recognizable as the villous-sheathed form; the third form 
