CATALOGUE OF PLANTS. 9 



5L S. eurycarpum Engelm. 



In shallow water, streams, and lake borders; frequent. Juae. 



52. S. simplex lluds. 



. In standing water in marshy places; common. Mid-June-July. 



TYPHA Tourn. Cat-tail P'lag. 



53. T. latifolia L. Common Cat-tail. 

 Marshy places; common. Mid-June-July. 



NAIADACEAE. Po.vdwep^d Family. 



NAIAS L. 



54. N. flexilis Rostk. & Schmidt. 

 Common in lakes. Summer. 



POTAMOGETON Tourn. Pond weed. 



[Dates under this genus refer to time of fruiting.] 



55. P. amplifolius Tuckerm. 



Abundant in Reed's Lake and Fisk Lake. July-Aug. 

 No floating leaves on deep water plants. 



56. P. foliosus Raf. (P. pauciflorus Pursh.) 

 In ponds and streams. July-Aug. 



Reed's Lake; Grand River (Prof. C. F. Wheeler). 



b1. P. foliosus Niagarensis (Tuckerm.) Morong. 



(P. pauciflorus Niagarensis Gray.) 

 In running water. July-Aug. 



Mill Creek near Alpine Station; Thornapple River at Cascade 

 Springs and Alaska. 



58. P. Friesii Ruprecht. (P. mucronatus Schrad.) 

 In still water. July-Aug. 



Grand River; abundant in Reed's Lake. 



P. 9nucronatus Schrad. does not occur in America. 



59. P. heterophyllus Schreb. 



Abundant in Pine Island Lake. Aug.-Sept. 



