256 NINETEENTH REPORT. 



SALICACE^. 



Salix fragilis Lin. 



River banks at Stoney Creek. An escape from cultivation. Seems to 

 have taken the place of S. alba in this vicinity. No. 41.521/2, May 25, 

 1916. 



Salix pedicellaris Pursh. var. hyperglauca Fernald. 



A very attractive bog willow. Frequent in bogs and wet meadows. 

 Has passed in our manuals for the EuroiDcan S. myrtilloides. Bloomfield, 

 No. 4198, June 15, 1916. 



ARISTOLOCHIACE^. 



Asarum reflexum Bicknell var. ambiguum Bicknell. 



Woods in Macomb Co., near Disco, No. 4156, May 25, 1916. 

 A. Canadense Lin. is credited to Michigan but such plants as I have 

 seen are referable to this species or to A. acuminatum (Ash) Bicknell. 



PERSICARIACEiE. 



Polygonum dumetorum Lin. 



This species probably has been confused with P. scandens Lin. and is 

 more frequent in the state than has been supposed. Rochester, No. 4417, 

 Sept. 3, 1916. 



ALSINACE^. 



ScLERANTHUS ANNUUS Lin. 



Fields at Detroit and Wyandotte. Reported by Dr. McCall of the 

 latter place as overrunning cultivated fields. No. 4314, July 11, 1916. 



CRUCIFERACEiE. 



Berteroa incana (Lin.) DC. 



A hoary pubescent, branching herb that is rapidly spreading and bids 

 fair to rival the Wild Mustard as a pernicious weed. Bloomfield, No. 

 4188, June 15, 1916. 



Arabis lyrata Lin. var, intermedia (DC), N. Comb. 



Arabis amhigiia DC. var. intermedia DC. Syst. II, 231, 1821. 



Arabis lyrata Lin. var. occidentalis Wats, in A. Gray Syn. Fl. N. 

 Amer. I, 159, 1895. 



Stigma together with very short and thick style about one-third of a 

 millimeter or less ; lower one-third of stem with its leaves more or less 

 hirsute. Has been recorded from three places. Bower's Harbor, Grand 



