210 THE MICHIGAN ACADEMY OF SCIENCE. 



E. fliiviatile Lin. var. limosum (Lin.), (E. limosum Lin. Sp. PI. 1062, 

 1753), differs from the species in having the fertile stem nnbranched. It 

 usually prefers dryer situations. In sandy grounds covered with a 

 sparse growth of grasses, etc. 



E. hyemale Lin. is frequent in swales near Palmer Park. 



Typliacew. 



Tyha angustifolia Lin., the small cat-tail, is not common within the 

 city limits but is very plentiful along the borders of Lake St. Clair. 



Potamogetonacew. 



Potamogeton lonchites Tuckerm. occurs in the -Detroit River. 



Potamogeton rutilus Wolf was found at the foot of McDougall Ave. 

 two or three years ago but since that time the slip where it grew has" 

 been filled in. Doubtless it occurs in other localities. 



Graminea'. 



Zea Mays Lin. Wild corn may occasionally be found in waste places 

 and in unimproved lots. I have collected it on Belle Isle. 



Paspalum Muhleubergii Nash. This is one of the new species that has 

 been carved out of P. ciliatfolium 2Ia-. It is frequent along fence rows 

 and clusters of shrubs. 



Panicum Crus-galli Lin. var. muricatum (Mx.) (P. muricatum Mx. 

 Fl. Bor. Am. I. 47, 1803). This is a small and rare form of the species 

 not over a foot in height (usually not over six inches) with simple, erect 

 culms and few-flowered spikes that bear a striking resemblance to those 

 of a Cenchrus, for which it is apt to be passed by. 



P. Crus-galli var. grandiflorum Doell. (EcJiinochloa longearistata 

 Nash'). This form is frequent along the shores of Belle Isle and is undoubt- 

 edly indigenous. It has very long flexous awns which, when mature, are 

 usually of a purplish tinge. 



P. flexile (Gatt.) Scridn., one of the many forms of P. capillare that 

 have been raised to specific rank, is frequent on Belle Isle. 



Agrostis stolonifera Lin. var. Gaudini Muel. (A. gigantca Gaud. A. 

 si/h-atica Host.) is frequent on Belle Isle; also the var. diffusa (Host.) 

 (Agrostis diffusa Host. Gram. Austr. 4. t. 55, 1809). 



Brachyelytrum erectum {Schrel).) Bcauv. is frequent in the woods at 

 Palmer Park. 



Panicularia fluitans (Lin.) 0. K. is sparingly found along the water 

 courses. 



Festuca ovina Lin., the Sheep's-Fescue, is frequent in fields. 



Hordeum nodosum Lin., the Wild Barley, is occasionally met with in 

 low, moist, grassy situations. 



Cypc7~ace(e. 



The different forms of swamp grass or sedges that have been found in 

 or around • Detroit during the past two years are as follows. They 

 abound in moist or swampy grounds : 



Cyperus esculentus Lin. 



