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1886. | BOTANICAL GAZETTE. 329 
its parents, but it had not occurred to me that the rare Carex 
flexilis is the other parent. In the Synopsis of North American 
Carices I guessed at Carex formosa as being the other parent, 
although that plant had not been found in the vicinity of Lake 
Superior, where Professor Macoun had found the hybrid. Dr. 
Jasey has loaned me the original specimens of Carex Knieskernii, 
together with Carex flexilis from the same source, and adds this 
note: “The original Carex Knieskernii was collected by myself, 
in company with Dr. Knieskern, on the ground of old Fort Bull, 
somewhere west or northwest of Kome, N. Y., near a small stream 
which, if I remember correctly, was called Fish Creek, and 
empties into Oneida Lake. The specimens of Carex flexilis are 
from the same locality.” This first collection was made in 1841. 
In 1869 Professor Macoun collected it at Kakabeka Falls, on the 
Canadian side of Lake Superior. The third finding was that of 
the present summer, a few miles this side of the international 
boundary. I obtained about a hundred specimens from two or 
three contiguous localities. Judging from its comparative fre- 
quency in these localities, I should expect to find the hybrid 
wherever Carex arctata and Carex flexilis grow near each other. 
Some of my specimens are almost indistinguishable from one 
parent, some from the other. They appear to have been the pro- 
ducts of reciprocal crosses. The hybrid may be distinguished in 
general as follows: 
Culm one and a half to two feet high, longer than the flat 
nerved, thin in texture, mostly surpassing the whitish, pointed 
scale (Fig. A). 
It is singular that a genus possessing imperfect flowers and so 
many species should present so few hy h 
remaining hybrid Carices which have been clearly made out in 
this country : 
CAREX DEBILIS X VIRESCENS Bailey, Proc. Amer. Acad. Arts 
and Sei., xxii. 105.—Plant slender and lax, very green, appearing 
