BEAL ON MICHIGAN FLORA. 41 



131. P. heterophyllus graminifolius (Fries) Morong. P. gramineus graminifolius 

 Flint, Macomb Co.; St. Glair Co., C. K. Dodge, and northward. 



132. P. heterophyllus longipedunculatus Morong. Woodward Lake, Ionia Co., 

 Fries. Detroit, O. A. Farwell; Bear Lake, Van Buren Co., E. J. Hill; Black Lake, 

 Cheboygan Co., B. & K. 



133. P. Hillii Morong. Hill's Pondweed. Marquette Co., E. J. Hill; St. Clair 

 Co., C. K. Dodge; Sturgis, F. P. Daniels. 



134. P. Illinoensis Morong. Manistee, F. P. Daniels. 



135. P. intermptus Kitaibel. Interrupted Pondweed. Manistee, E. J. Hill; Port 

 Huron, C. K. Dodge. 



136. P. lateralis Morong. Opposite-leafed Pondweed. Bear Lake, Van Buren 

 Co., E. J. Hill; St. Clair Lake & River, C. K. Dodge. Rare. 



*137. P. lonchites Tuckerman. Long-leafed Pondweed. P. fluitans Roth. Hub- 

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

 Co.; Manistee, F. P. Daniels. Infrequent. L. P. 



*13S. P. lucens L. Shining. Pond weed. Muskegon River, near Houghton Lake; 

 Flint; S. Mich., Wright Cat.; Detroit River, D. H. Campbell; Lake Superior, Agas- 

 siz. Th. 



139. P. marinus L. Crystal Lake near Frankfort, Benzie Co., E. J. Hill; St. 

 Clair Co., C. K. Dodge. 



*140. P. natans L. Common Floating Pondweed. Ponds. Frequent. Th. 



141. P. Nuttallii Cham. & Sch. P. Pennsylvanicus Cham. Ionia Co.; Macomb 

 Co., Dr. D. Cooley; Fruitport, E. J. Hill; Keweenaw Co., O. A. Farwell. Th. 



142. P. obtusifolius Mertens & Koch. Blunt-leafed Pondweed. "Floating in 

 Gratiot Lake, N. Mich." Gray's Manual. St. Clair Co., J. W. Stacey. 



*143. P. pectinatus L. Fennel-leafed Pondweed. Frequent. Th. 



*144. P. perfoliatus L. Clasping-leafed Pondweed. Detroit, O. A. Farwell; 

 Ingham Co., C. F. Wheeler, and northward. Common. 



146. P. perfoliatus Richardsonii A. Bennett. P. perfolatus lanceolatus Robbins. 

 Detroit, O. A. Farwell; Bay Co., G. M. Bradford. 



*147. P. praelongus Wulfen. White-stemmed Pondweed. Maple River; Pine 

 Lake, Ingham Co.; Black Lake, Cheboygan Co. Common. Th. 



148. P. pusillus L. Small Pondweed. Manistee Lake, E. J. Hill; Detroit River, 

 D. H. Campbell; Manistee, F. P. Daniels; St. Clair Lake and River, C. K. Dodge. 



*149. P. Robbinsii Oakes. Robbins' Pondweed. North shore of Lake Superior; 

 Pine Lake, seven miles N. E. of the Agricultural College, the only station known 

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



151. P. rutilis Wolfg. Slender Pondweed. Detroit River, between Pech Q Isle 

 and Belle Isle, C. F. Wheeler; Round Lake, near Jackson; St. Clair Lake & River, 

 C. K. Dodge. 



152. P. spathulaeformis (Robbins) Morong. Spatulate-leafed Pondweed. New 

 Baltimore, Lake St. Clair, A. J. Pieters, J. W. Stacey. 



153. P. Spirillus Tuckerman. Spiral Pondweed. "Lake Superior," A. Gray's 

 Manual; Keweenaw Co., 0. A. Farwell; St. Clair Lake and River, C. K. Dodge. 



154. P. Vaseyi Robbins. St. Clair Lake and River, C. K. Dodge; Algonac, W. S. 

 Cooper. 



*155. P. Zizii Roth. Ziz's Pondweed. P. angustifolius Berch & Presl. Crystal 

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

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



*156. P. zosteraefolius Schum. Eel-grass. Pondweed. Common. Th. 



ZANNICHELLIA t. 



157. Z. palustris L. Zannichellia. Dr. A. B. Lyons, Detroit; Bay City, G. M. 

 Bradford. Rare. 



NAIAS L. 



*158. N. fiexilis (Willd.) Rost. & Schmidt. Slender Naias. Ponds. Frequent. 

 Th. 



*159. N. fiexilis robusta Morong. South Haven, Park Lake, Clinton Co., Bailey; 

 St. Clair Co., C. K. Dodge. 



160. ft. marina L. Large Naias. Flint, Dr. D. Clark. 



6 



