362 TWENTY-FIRST REPORT. 



Carex sterilis Willd. (C. scirpoidcs Schk.) There are two forms of this 

 species found here in Michigan. One is found in open bogs and swamps and 

 along the borders of woods and the other in dense boggy woods such as tama- 

 rack swamp, cedar swamps, etc., where spliagnum is liable to be found. The 

 former has the stiff, wiry habit of C. echinafa, but the leaves are narrower^ 1 

 to 114 lines wide and the perigyiiia are broader, the width being more than 

 % the length, and gradually tapering into the inconspicuously bifid beak, the 

 edges being strongly roughened, about lYi lines long by about % line wide, 

 finally becoming yellowish or brownish. Often dioecious. This form prob- 

 aby is typical of Willdenow's C. sterilin. The latter is slender, lax, with 

 leaves only % as wide, the green perigynia abruptly contracted into the beak, 

 the edges being minutely roughened ; it is essentially the plant described by 

 Bailey as C. interior. It seems to the present writer that the difference out- 

 lined is mainly that which might be sought in a shade form of an ordinarily 

 sunlight plant and therefore this form should be proi>erly treated as a varia- 

 tion rather than as a distinct species. It may be known as C. sterilis Willd. f. 

 FLEXI15ILIS, n. f. Lakeville, June 2, 1918, No. 4S87. 



Carex vulpinoidea Mx. var. onihif/ua Barratt. A rare form of the species 

 in Michigan. Spikes yellowish brown and forming a strong contrast to the 

 usually green or brownish spikes of the species. Detroit, June 16, 1900, No. 

 1670; Junior, July 13, 1918, Farwell & Billington, No. 5074. 



Carex stricta Lam. var. strictior (Dew.) A. Gr. {C. stricta var. curtissimn 

 Peck). Does not form dense tussocks as does the species. Keweenaw Point, 

 Aug. 26, 1887, No. 565, and Aug. 1904, No. 18311/2 ; Ypsilanti, July 29, 1906, No. 

 565b ; Orion, June 9, 1918, No. 4,933. 



Carex stricta Lam. var. xerocarpa (S. H. Wright) Brittf)n. In moist 

 woods near Rochester, May 28. 1918, No. 487") and No. 4882c. 



Carex axirea Nutt f. colorata u. f. The scales pale brown. In tamarack 

 swamps at Lakeville, June 2, 1918, No. 4882g. 



Carex Harperi Fernald (V). These plants api)ear to be intermediate 

 between this species and C. leptalea Wahlen]>. The persistent scales are 

 brownish and mucx'onate instead of while and acuminate, but the perigynia 

 are slender, and gradually tapering at the base and the acheues are punc- 

 ticulate and sharply trigonous as in C. Harperi.. Orion, Jime 9, 1918. No. 

 4929; Parkedale, July 4, 1918, No. 5034. 



Carex umbcUata Schkuhr. var. hrcxnrostris Boot. Banks of the Huron 

 River at Ypsilanti. May 19, 1918, No. 4831, Billington & Farwell. 



Carex Petmsylvamca Lam. var. luoorum (Willd.) Fernald. Port Huron, 

 June 23, 1918, No. 4985 ; Detroit, June 11^ 1903, No. 1800. 



