MICHIGAN ACADEMY OF SCIENCE. 253 



CYPERACE^. 



Trichophyllum rostellatum (Torr.) Farwell. 



Said to be rare in Michigan. The tough, sterile stems recline upon 

 the earth and when well rooted at the proliferous apex are very liable 

 to trip up the unwary traveler. Marl lake, No. 4302, July 9, 1916. 



Eriophorum cyperinum Lin. var. pelium (Fernald), N. Comb. 



Scirpus cyperinus (Lin.) Kunth var. pelius Fernald, Rliodora VIII, 



164, 1906. 

 In swamps throughout the state; infrequent in southern Michigan but 

 common in tlie Upper Peninsula. Marl lake. No. 4358, August 13, 1916. 



Triodon albus (Lin.), n. comb. 



Schoenus albus Lin. Sp. PI. 44, 1753. 



Triodon albus (Lin.) var. macer (Clarke), N. comb. 



Rhynchospora alba (Lin.) Vahl. var. macra Clarke in Britt. Trans. 

 N. Y. Acad. Sci. XI, 88, 1892. 



The variety macer has not heretofore been reported from Michigan, 

 in so far as I am aware. It is a tall, coarse plant with a corymb 2-4 

 cm. broad. Marl lake. No. 4375, August 13, 1916. Bloomfield Center, 

 No. 4399, August 22, 1916. 



Mariscus mariscoides (Torrey) O. K. Said to be infrequent. Marl 

 lake. No. 4303, July 9, 1916, and No. 4364, August 13, 1916. 



Scleria verticillata Muhl. 



A rare species in Michigan. I have seen it only on marl beds. Marl 

 lake. No. 4367, August 13, 1916. 



Carex diandra Schrank var. ramosa (Boot) Fernald. 



Apparently this form is more common in Michigan than the species, at 

 least in the southeastern section. Marl lake. No. 4312, July 9, 1916. 



Carex chordorhiza Lin. f. 



This species, recorded as rare in Michigan, is quite common in an ex- 

 tensive peat bog in the vicinity of Pontiac, No. 4223, June 18, 1916. 



Carex polygama Schk. var. heterostachya (Anderss.), N. Comb. 



Carex Buxbaiimii Wahl. var. heterostachya Anderss. Cyper. Scand. 39, 

 1849. 



In this form the terminal spike is entirely staminate. Quite common 

 in places. Algonac, No. 4230, June 22, 1916; Detroit, No. 2034, July 

 14, 1907. 



