Rbodora 
JOURNAL OF 
THE NEW ENGLAND BOTANICAL CLUB 
Vol. 20. October, 1918. No. 238 
ERAGROSTIS PEREGRINA A FREQUENT PLANT ABOUT 
PHILADELPHIA. 
BAYARD Lona. 
Proressor K. M. Wiraanp, in his recent study of Eragrostis 
peregrina,’ found (exclusive of his own Ithaca material) a totality 
of seven specimens at the Gray Herbarium and the New York Botani- 
can Garden, representing the occurrence in Europe, Asia, and North 
America of this little known weed. That two of these specimens 
came from the vicinity of Philadelphia — Lancaster, Pennsylvania 
and Mickleton, New Jersey — was a fact at once suggestive to a 
Philadelphian. 
Only a year or two previously an occasion had arisen for me to 
dip into the Purshii-pilosa problem of Eragrostis. It had been con- 
cluded that our most common representative of this troublesome 
alliance could be separated out, with a very fair degree of satisfaction, 
as E. Purshiit, but what remained as the supposed E. pilosa was 
certainly no homogeneous series. Old World material of what appar- 
ently was considered this latter species by European botanists was 
readily matched by quite a number of collections from the local area. 
But, very different superficially from E. pilosa, there had remained 
still other forms — which, perforce, for want of a better solution, 
had been left, as found, under this species. 
The diagnostic characters of E. peregrina were so clearly brought _ 
out by Professor Wiegand, that, as his paper was read, there came a 
` recollection of one of the forms which had failed of being matched 
1 Wiegand, Ruopona, xix. 93 (1917). 
