N'aiadacem and Cyperaceee. 
107 
602. P. perfoliatus , L. 
Common. 
603. P. zoster cefolius, Schum. 
University bay. Lake Mendota. 
604. P. mucronatus , Schrad. 
Lagoon on Picnic Point. 
605. P. pectinatus, L. 
University bay, Lake Mendota. 
606. P. marinus. 
Lagoon on Picnic Point. 
Naias, L. Naiad. . 
607. N. ftexilis, Rostk. & Schmidt. 
With Potamogeton marinus. 
Cyperace^:. (Sedge Family.) 
Cyperus, Tourn. Galingale. 
608. C. diandrus , Torr. 
Common on sandy beaches. 
609. C. Schieeinitzii , Torr. 
Sandy ridge east of Lake Wingra. Rare. 
610. C. Jiliculmis , Yahl. 
Dry, sandy soil about the lakes. Local. 
611. C. strigosus , L. 
Rather common in wet sandy places. 
Dulichium, Pers. 
612. D. spathaceum , Pers. 
Growing in shallow water along margins of lakes. 
Not rare. 
Eleocharis, R.Br. Spike-rush. 
613. E. ovata , R.Br. 
Common about ponds. 
614. E. palustris, R.Br.? 
Shallow places' in the lakes and in very wet land 
Common. 
615. E. compressa , Sullivant. 
Wet places. Not common. 
616. E. acicularis , R.Br. 
Muddy places. Widely distributed. 
