38 Rhodora [FEBRUARY 
County and numerous forms of it were collected from typical material 
to one collection which very closely approached P. heterophyllum Bose 
(P. columbianum Scribn.). 
PANICUM UMBROSUM Le Conte (P. Ashei Pearson). This species 
was collected once more and was fairly plentiful in the locality. No. 
480, among boulders back of rocky coast, near Dana's Beach, Man- 
chester, Oct. 1, 1912. 
Additions to previous list of species collected in Essex County; 
noting specimens in the Gray Herbarium or the Herbarium of the 
New England Botanical Club or where there are published records of 
the species from Essex County. 
P. Lindheimeri Nash. 
P. meridionale Ashe. 
P. heterophyllum Bose var. thinium (Hitehe. & Chase) Hubbard. 
P. latifolium L. N. E. Bot. Club; Robinson, Fl. Essex Co. 130 
(1880) 
CAMBRIDGE, MASSACHUSETTS. 
THE VARIATIONS OF LUZULA CAMPESTRIS IN NORTH 
AMERICA. 
M. L. FERNALD and K. M. WIEGAND. 
THE cosmopolitan species, Luzula campestris (L.) DC., has been 
treated by Buchenau ! as consisting of twenty geographical varieties 
and by him has been kept apart specifically from the American L. 
comosa Meyer. In the study of certain collections from northeastern 
America, however, the writers, who have found it necessary to organize 
the material of these two species in the Gray Herbarium and during 
the prosecution of this study have been kindly loaned the local col- 
lection of the Academy of Natural Sciences of Philadelphia, have 
found it impossible to maintain any real specific lines between these 
two plants. In this failure to find specific lines between L. campestris 
and L. comosa they have arrived at the conclusion which has already 
been reached by several other students, for example Otto Kuntze ? 
! Buchenau in Engler, Pflanzenf. iv. Fam. 36, 83-95 (1906). 
? Kuntze, Revis. Gen. Pl. ii. 724 (1891). 
