FLORA OF MICHIGAN. 147 



461. ZANNICHELLIA, Micheli. HORNED PONDWEED. 



1310. Z. palustris, L. 



Dr. A. B. Lyons ; W. Bay City. Rare. 



462. NAIAS, L. 



1311. N. marina, L. Naiad. 

 Flint, Dr. D. Clark. 



*1312. X. flexilis, Rostk. & Schmidt, Th. 



Ponds. Frequent. 



*1313. v var. robusta, Morong. 



South Haven; Park lake, Clinton Co., Bailey. 



CVI. EKIOCAULE^. PIPEWORT FAMILY. 



463. ERIOCAULON, L. 



13H. E. septangulare, With. Th. 



Margin of Long lake, Cheboygan Co., B. & K.; S. W., Wright Cat.; Macomb Co., Cooley; 

 Escanaba, E. J. Hill. Infrequent. 



CYII. CYPEKACE^E. SEDGE FAMILY. 



464. CYPERUS, Tourn. GALINGALE. 



1315. C. iiavescens, L. S. 



Grand Rapids, Coleman Cat.; S. Mich., Wright Cat. Rare. 



*1316. C. diandrus, Torr. C. & S. 



Low grounds. Common. 



*1317. var. castaiieus, Torr. 



Frequent. 



*1318. C. aristatus, Rottb. 

 Grand Rapids, Coleman ; Ionia; banks of Cedar river, Agricultural College grounds. Not common 



1319. C. Schweiiiitzii, Torr. S. W. 

 Lake Michigan shore at S. Haven, Bailey; Kalamazoo, Tuthill. 



1320. C. Houghtoiiii, Torr. 



Hilltops near Indian River, Wheeler; Long Lake, Cheboygan Co., B. & K. 



*1321. C. ffliculmis, Vahl. C. & S. 



Sterile soil. Common. 



*1322. C. erythrorhizos, Muhl. S. 



Macomb Co., Dr. D. Cooley; near Agricultural College. Infrequent. 



*1323. C. esculentus, L. L. P. 



A troublesome weed on low grounds, spreading rapidly by means of its nut-like tubers. Hard to 

 eradicate. Muir ; Flint ; Grand Rapids ; north to Oscoda, Frequent. 



*1324. C. strigosus, L. C. & S. 



Low grounds. Common. 



1325. C. speciosus, Vahl. 



Low grounds. Hubbardston; Flint, etc. 



*1326. C. Engelmaimi, Steud. 

 Frnitport, E. J. Hill; shore of Park Lake, Clinton Co., C. F. Wheeler. Rare. 



' 19 



).,-C. F.Wl 



