146 FLORA OF MICHIGAN. 



1289. P. liybridus, Michx. 

 Dr. A. B. Lyons. 



1290. P. rufescens, Schrader. N. & U. P. 

 Mud Lake and Bear River; Petoskey, E. J. Hill ; Keweenaw Co.. F. 



*1291. P. fluitans, Roth. L. P. 



Hnbbardston; Macomb Co.; Detroit River, D. H. Campbell; Portage Lake, Crawford Co. 

 Infrequent. 



*1292. P. amplifolius, Tuckerman. Th. 



Maple River; Macomb Co. ; Pere Marquette River at Ludington, E. J. Hill. 



*1293. P. heterophy Hits, Schreb. Th. 



Woodward Lake, Ionia Co.; Flint; Macomb Co. ; and northward. 



1294. var. graminifolius (Fries). 



Bear Lake, Van Buren Co., E. J. Hill ; Black Lake, Cheboygan Co., B. & K'. 



*1295. P. Zizii, Mert. & Koch. 



Crystal Lake, near Frankfort, and Bear Lake, Manistee Co., E. J. Hill; Crystal Lake, Montcalm Co., 

 and Woodward -Lake, Ionia Co.; Detroit River, D. H. Campbell. Infrequent. 



* 1296. P. lucens, K Th. 



Mnskegon River, near H9ughton Lake; Flint; S. Mich., Wright. Cat; Detroit River, D. H. Camp- 

 bell ; Lake Superior, Agassiz. 



'*1297. P. prseloiigus, Wulfen. Th. 



Maple River; Pine Lake, Ingham Co.; Black Lake, Cheboygan Co. Common. 



*1298. P. perfoliatus, L. Th. 



Pine Lake, Ingham Co. and northward. Common. 



1299. var. laiiceolatus, Robbins. Th. 



Little Traverse Bay. etc. ; " Along the Great Lakes," Gray. 



*1300. P. zostersefolius, Schum. Th. 



Common. 



1301. P. Hillii, MoroDg. 

 Marquette Co., E. J. Hill. 



1302. P. obtusifolius, Mertens & Koch. 

 " Floating in Gratiot Lake, N. Mich.," Gray's Manual. 



*1303. P. pauciflorus, Pursh. Th. 



Hubbardston; Grand Rapids; Flint; Macomb Co., and northward. Typical forms occur at Manistee 

 and Frankfort,-E. J. Hill. 



1304. var. Niagareusis, Gray. 



In running water, Hubbardston ; Macomb Co., and along the Great Lakes. 



1305. P. pusillus, L. 



Manistee Lake, E. J. Hill ; Detroit River, D. H. Campbell. 



* 1306. P. mucroiiatus, Schrad. 



Crooked River, Cheboygan Co., and common at Manistee and Frankfort, E. J. Hill; Oscoda; St. 

 Mary's River; Sault de Ste. Marie. 



*1307. P. pectiiiatus, L. Th. 



Frequent. 



1303. P. mariims, L. 



Crystal Lake, near Frankfort, Benzie Co., E. J. Hill. 



*1309. P. Robbiiisii, Oakes. 



N. shore Lake Superior; Pine lake, seven miles N. E. of the Agricultural College. 1891, the only station 

 known in the L. P., C. F. Wheeler. 



