TRbooora 
JOURNAL OF 
THE NEW ENGLAND BOTANICAL CLUB 
Vol. 21. August, 1919. No. 248. 
THE SPECIFIC CHARACTERS OF ERAGROSTIS PEREGRINA 
AND ITS TWO ALLIES. 
BAYARD Lona. 
HACKEL based his Eragrostis pilosa var. condensata' upon a weed 
occurring in the Grand-Ducal Palace Garden at Karlsruhe. When 
Professor K. M. Wiegand renamed this plant E. peregrina? in 1917 
he had material from eight stations. In a recent article on the occur- 
rence of the species about Philadelphia ? it was noted as frequent in 
this region and more than thirty-five stations for it were mentioned. 
The greater number of these records are supported by copious suites 
of material, mostly collected during 1917. In the past season a 
goodly number of additional collections have been made, especially 
by Mr. Harold W. Pretz in Lehigh County, Pennsylvania. In conse- 
quence there have accumulated at Philadelphia some hundreds of 
specimens from more than fifty stations. Because of this abundant 
material now at hand— much more than previously has been avail- 
able in any study of this plant— a favorable opportunity has arisen 
to amplify or, in some cases, to reconsider the characters advanced 
by Hackel and the additional ones noted by Professor Wiegand, as 
well as to weigh their critical comments. 
The affinities of this plant, it may be well to recall, lie with Æ. 
Purshii as well as E. pilosa. There has been a failure among many 
American botanists in rather recent years to separate the two latter 
species, but a preliminary study several years ago indicated that these 
à i 
1 Hackel, Allgem. Bot. Zeitschr. vii. 13 (1901). 
2 Wiegand, Ruopora, xix. 93 (1917). 
3 Long, Ruopora, xx. 173 (1918). 
