202 THE MICHIGAN ACADEMY OP SCIENCE. 



covers considerable ground on the top of a ridge of ground near Rochester, 

 which is considerably south of its generally accepted range. 



^parganiaccce. 



Sparganiuni simplex Huds. var. Aniericauuui {Nutt.) (*S'. Amcricanum 

 Nutt. Gen. 2, 203, 1818; >S'. s^implcx var. NuttallH Engelm.) seems worthy 

 of recognition; it has the heads truly axillary while the type has them 

 supra-axillary. The number of localities are rare in Keweenaw county, 

 but the plant is rather plentiful in each place where it occurs. 



Potamogetonacew. 



Potamogeton Zizii Roth. Orion Lake. Frequent. 

 Potamogeton diversifolius Raf. Keweenaw county. Rare. 



Gmminew. 



Panicuni Crus-galli L.. the common barnyard grass occurs in three 

 well defined forms which were well outlined by Pursh. The type is a 

 tall smooth grass growing on ballast and in waste places; the flower- 

 ing glumes are all short aicncd. Var. mite Pursh [Var. muticum Ell.), 

 is a lower plant, very often prostrate, green or yellowish throughout 

 and with acute or muticous not awned glumes. Var. purpureum Ph., 

 is an intermediate form with purplish spikes having the flowering glumes 

 mucronate or a scattering few long-awned. Another form var. Walteri 

 (Ph.) 0. A. F., is found near the Water Works Park at Detroit and in 

 various other parts of the State ; it differs from the type in having sheaths 

 papillose-hispid. The last named variety appears to be truly indigenous ; 

 the other two varieties seem to be introductions. 



Panicum boreale JVasli. is frequent in Keweenaw county and probably 

 throughout the State. With the preceding, but much more common is 

 P. implicatum ^Scrihn. The former is found along the borders of woods 

 and in copses; the latter in swamps. 



Chetochloa Italica {Lin.) Scrihn. var Germanica (Mill.) iS'c/-/?>«., a 

 form of the Hungarian grass, is not uncommon in waste places at Detroit. 

 Phleum alpinum Lin., the Mountain Timothy is scarce. The only place 

 I have found it is at Mt. Houghton near the northern end of the Kewee- 

 naw Peninsula. 



Sporobolus cuspidatus (Torr.) Wood, was collected in the crevices of 

 rocks on bluffs near Clifton in 1895. It is rare. 



Agrostis stolonifera Lin. var. minor {Yasey). [Agrostis alha var. 

 minor Vasey, Con., U. S., Nat. Herb., 3, 78, 1892), is not uncommon in 

 Keweenaw county, where it seems to be indigenous. The var. varia 

 {Host) Mud. is frequent in Keweenaw Co. also and probably native. There 

 are three forms of A. hyemalis {Walt.) B. S. P. The type, which grows 

 in meadows, pastures, swamps, etc., is often two or three feet high with 

 the large, open, capillary panicle often over a foot long, the branches pur- 

 plish and scabrous; leaves short, flat, narrow, some of them involute. 

 A dwarf caepitose variety three to six inches high with a short con- 

 tracted oblong or linear panicle an inch or so in length and with in- 

 volute leaves is found on rocky bluffs at Clifton, Keweenaw county. It 

 mav be known as Agrostis hyemalis var. oreophila {Trin.) ; this is the 



