Rhodora 
JOURNAL OF 
THE NEW ENGLAND BOTANICAL CLUB 
Vol. 3 May, 1go1 No. 29 
THE NEW ENGLAND SPECIES OF THE GENUS 
PANICUM. 
F. LAMsoN-SCRIBNER and ELMER D. MERRILL. 
THE paper here presented on the * New England Species of the 
Genus Panicum " is based almost entirely upon material loaned by 
the New England Botanical Club, the Gray Herbarium and a num- 
ber of individuals whose names are given whenever their specimens 
are cited. Much of the value of the paper rests upon the fact 
that the great number of localities given, indicates very fully the dis- 
tribution of the species enumerated. 
In spite of the length of time which the authors have had for the 
preparation of this synopsis and the ample material with which they 
have been so kindly supplied by many New England botanists, the 
work is far from perfect and probably no one will realize this more 
fully than do the authors themselves. We can never come to a satis- 
factory conclusion in regard to the limitations of certain of the spe- 
cies now recognized in the group which contains Panicum dichotomum 
and in fact, the authors in preparing this paper have not always 
agreed on the limitations of certain species and varieties. It is pos- 
sible that the examination of the herbaria of some of the older authors 
may clear up some of the doubtfully identified species, but we are not 
sure that this would be the result as these authors very frequently 
had an imperfect conception of specific limits in this group and their 
type or so-called type material is apt to consist of heterogeneous col- 
lections which later botanists regard as distinct species. In no case 
is this more likely to occur than in the species which we have here 
taken up under the name of Panicum unciphyllum Trin., the limita- 
tions of which are very doubtful indeed, and this species of Trinius 
