90 TWELFTH ANNUAL REPORT. 



H. Canadeuse, Michx. Canada Hawkweed. 



Common, or frequent, throughout the state; abundant north of lake Superior, 

 Roberts. 



H. scabriim, Michx. Rough Hawkweed. 



St. Croix river. Parry; Saint ClouA, CampheU; Beaver Bay, Roberts; Pembina, 

 Chicliering. (A hawkweed agreeing with Gray's description of this species in bearing 

 40- to 50-flowered heads, but in other characters like H. paniculatum, grows in the Red 

 river valley on moist prairie, TJpliam.) 



H. lougipiliim, Torr. Longr-bearded Hawkweed. 



St. Croix river, Parry; Blue Earth county, Leiberg. Rare. South. 



H. venosiim, L. Rattlesnake-weed. 



Red river prairie, Dawson, Scott. Infrequent. 



PRENANTHES, Vaill. (Including Nabalus, Cass.) Rattle- 



SNAKE-EOOT. 



P. alba, L. White Lettuce. Rattlesnake-root. 

 Common throughout the state. 



P. serpeiitaria, Pursh.* (N. albus, Hook., var. serpentaria, Gray.) Rat- 

 tlesnake-root. 



Hennepin county, Herrick; Stearns county, Campbell. [Devil's lake, Dakota, 

 Geyer.] 



P. altissinia, L. Tall White Lettuce. 



Between lake Superior and the lake of the Woods, Macoun, 



P.raceniosa, Michx. Rattlesnake-root. 

 Frequent, or common, throughout the state. 



P. aspera, Michx, Rattlesnake-root. 



Frequent through the south half of the state ; extending north to Stearns county, 

 Campbell, and Douglas county, Mrs. Terry. 



P. crepidinea, Michx. Rattlesnake-root. 



Lake Benton, Lincoln county, Upham. Infrequent. South. 



LYGODESMIA, Don. Ltgodesmia. 



li. jiincea, Don. Lygodesmia. 



Common southwest ward, on sandy land; extending north and east to Muskoda, 

 Clay county, and Sand Hill river, Upham, Pembina, Havard, Meeker county, Campbell, 

 Minrfeapolis, Roberts, St. Croix river, Sivezey, and Blue Earth county, Leiberg. 



[Crepis runcinata, Torr. & Gray, whose eastern limit extends from the Saskatchewan 

 region to Nebraska and Iowa {Arthur), and the nearly related C. glauca, Torr. & Gray, 

 of similar range, seem likely to be found in western Minnesota.] 



*Pbenakthk8 SERPENTARIA, Pursh. Commonly2 feet high, glabrous or a 111 tie 

 hirsute-pubescent : stem sometimes purple-spotted, rather stout : leaves diversely 

 variable, assuming all the forms of the preceding species : inflorescence corymbosely 

 thyrsoid-paniculate ; the heads mostly glomerate at summit of ascending or spreading 

 flowering-branches or peduncles: involucre green, rarely purplish-tinged, 8- to 12- 

 flowered ; flowers purplish, greenish white or ochroleucous : pappus sordid straw- 

 color or whitish. . .. Open grounds, commonly in sandy or sterile soil. Oray's Synop. 

 tical Flora of N. A. 



