STATE GEOLOGIST. 139 



HYDROCHARIDACE^. Frog's-bit Family. 



AN ACH ARIS , Richard . Water- weed . 



A. Canadensis, Planchon. "Water-weed. 



Common throughout the state. Duluth harbor (plentiful), and Minneapolis, Rob- 

 erts; lake Minnetonka, Miss Butler; Winona lake, Holzinger; Blue Earth county. Lei- 

 berg; plentiful in Martin county, and in Emmet county, Iowa, Cratty. This aquatic 

 plant, common, but nowhere troublesome, in this its native country, having become 

 naturalized in Europe, grows there more rankly. so as to become in many places a 

 serious obstruction to river-navigation. Since 1836, when it first appeared in England 

 and Ireland, it has spread eastward upon the continent along the rivers of Belgium, 

 Holland and Germany, aud is now complained of at Riga in western Russia. Popular 

 Science Monthly, vol. xix, p. 430 (July, 1881). 



VAI.LISNERIA, Micheli. Tape-grass. Eel-grass. 



V. spiralis, L. Tape-grass. Eel-grass. 



"With the preceding, in Duluth harbor (plentiful), and Minneapolis, Roberts, (lake 

 Calhoun) Miss Butler; Blue Earth county, Ge6(je, (Eagle lake) Leiberg; Redwood Falls, 

 Miss Butler. 



ORCHIDACE^. Orchis Family. 



ORCHIS, L. Orchis. 



O. spectabilis, L. Showy Orchis. 



Duluth (frequent), and Saint Paul (rare). Miss Cathcart; Stearns county, Campbell; 

 Fergus Falls, Leonard; Minneapolis (frequent), Roberts; Northfield, Chaney; Faribault, 

 MissBeane-^ Blue Earth county, Leiberg; frequent atHesper, Iowa. Mrs. Carter. 



O. rotiindifolia, Pursh. (Habenaria rotundifolia, Richardson.) Orchis. 

 Detroit, Becker county, Gedge. Rare. North. 



HABENARIA, Willd. Rein- Orchis. 



H. tridentata, Hook. Rein-Orchis. 



Lapham. Goodhue county, Sandberg. [North of lake Superior, Agassiz.] In- 

 frequent. 



H. virescens, Spreng. Greenish Orchis. 



Lake City, Miss Manning; Goodhue county, Sandberg; Minneapolis, Roberts; 

 Stearns county, Campbell; Detroit, Becker county, Gedge. Infrequent. 



H. viridis, R. Br., var. bracteata, Reich. Bracted Green Orchis. 



Throughout the state. Carlton's Peak, north of lake Superior, and also near Min- 

 neapolis, Roberts; eastern border of Red river prairie, Dawson; Stearns county, Camp- 

 bell; lake Elmo, AVashington county, ieonard; Blue Earth county, l/ei/jerg; Faribault, 

 Miss Beane; Winon-d, connty, Holzinger. [Hesper, Mrs. Carter, a,ad south to Council 

 Bluffs, Iowa, Geyer.] 



style, and crested back and sides. . . . Near S.graminea, Michx., and perhaps only 

 a variety of it, although the only other Sagittaria with such crests to the achenia is S . 

 natans, Michx. Further observations are needed to eventually place it correctly. 

 Letter of Dr. Engelmann, dated March 15th, 1882, in Arthur's Contributions to the Flora 

 of Iowa. No. V. 



