STATE GEOLOGIST. 135 



ACORUS, L. Sweet Flag. Calamus. 



A. Calamus, L. Sweefc-Flag. Calamus. 



Common, or frequent, throughout the state ; excepting perhaps southwestward, in 

 which direction it extends at least to Redwood Falls, Miss Butler, and Emmet county, 

 Iowa (rare), Cratty. 



LEMNACEtE. Duckweed Family. 



L/EMNA, L. Duckweed. Duck's-meat. 



L. trisulca, L. Duckweed. Duck's-meat. 



Throughout the state. Minnesota river. Parry; Blue Earth county (flowering plen- 

 tifully in 1882), ieibej'f/; frequent In Martin county, and in Emmet county, Iowa, Cratty; 

 Minneapolis, ^rfftxtr, Roberts; Taylor's Falls, Mrs. Bay; Pembina, CMekering; Red 

 river prairie and lake of the Woods, Dawson. 



Ij. minor, L. Duckweed. Duck's-meat. 



Throughout the state. Blue Earth county, Leib&rg; Minneapolis, Arthur, Sim- 

 mons; Duluth harbor (plentiful), Roberts; also. Red river prairie and lake of the Woods 

 (common), Dawson. 



SPEIBODELA, Schleid. Duckweed. Duck's-meat. 



S. polyrrhiza, Schleid. (Lemna polyrrhiza, L.) Duckweed. Duck's-meat. 

 Throughout the state. Blue Earth county, Leiherg; frequent in Martin county, and 

 in Emmet county, Iowa, Cratty; Minneapolis (abundant), Arthur, Upham; Saint Paul, 

 Kelley; and northwest to the Saskatchewan river. 



WOLFFIA, Hbrkel, Schleid. Wolppia. 



W. Columbiana, Karsten. Wolffia. 



Found by Mr. Leiberg in a pond at the southwest edge of the village of South Bend, 

 Blue Earth county ; plentiful, covering the surface to a depth of one or two inches in 

 the summer ; often blown upon the shore in small ridges by storms ; slightly spreading 

 to adjacent ponds; determined by Dr. Engelmann, who thinks that it is not a native of 

 these northern latitudes, but has been probably brought by water-fowls. It appears to 

 have become thoroughly acclimated In this locality. 



TYPHACE^. Cat-tail Family. 



TYPHA,Tourn. Cat-tail Flag. 



T. latifolia, L. Common Cat-tail. Reed-mace. 

 Common throughout the state. 



SPARG-ANTUM, Tourn. Bur-reed. 



S. eurycarpum, Engelm. Bur-reed. 



Throughout the state. Lake of the Woods, Dawson; Minneapolis (common), 

 Roberts; West Saint Paul, Miss Butler; Wabasha, GHbson; Blue Earth county, Leiberg; 

 Redwood Falls, Pemberton; Emmet county, Iowa (rare), Cratty. 



S. simplex, Hudson. Bur-reed. 



Red river valley, at Pembina, ChicTtering; Agate bay, lake Superior, Juni; West 

 Saint Paul, Miss Butler; lake Pepin, Miss Manning. 



