578 MINNESOTA BOTANICAL STUDIES. 



Salix lucida MUHL. Neue Schrift. Ges. Nat. Fr. Berlin 4 : 239. 



pL 6.f. j, 1803. 

 Coll. : MacMillan & Skinner 366, Holmes. 



BETULACE^E. 



Corylus americana WALT. Fl. Car. 236. 1788. 

 Coll. : MacMillan & Skinner 415, Crookston. 



Betula papyrifera MARSH. Arb. Am. 19. 1785. 

 Coll. : MacMillan & Skinner 178, Maple lake. 



Betula glandulosa MICHX. Fl. Bor. Am. 2: 180. 1803. 

 Coll. : Ballard 2803, Warren. 



Alnus alnobetula (EHRH.) K. KOCH, Dendr. 2: Part i, 625. 



1872. 

 Coll. : MacMillan & Skinner 151, Maple lake. 



FAGACE^E. 



Quercus alba L. Sp. PI. 996. 1753. 

 Coll. : Ballard 2753, Hallock. 



Quercus macrocarpa MICHX. Hist. Chen. Am. 2. pL 23. 1801. 

 Coll. : MacMillan & Skinner 280, Thief River Falls. 



HORACES. 



Humulus lupulus L. Sp. PI. 1028. 1753. 



Coll. : MacMillan & Skinner 26, Crookston. 



URTICACE^E. 



Urtica gracilis AIT. Hort. Kew. 3: 341. 1789. 

 Coll. : MacMillan & Skinner 199, Crookston. 



Urticastrum divaricatum (L.) KUNTZE, Rev. Gen. PI. 635. 



1891. 

 Coll. : MacMillan & Skinner 193, Crookston. 



POLYGONACE.E. 



Rumex verticillatus L. Sp. PI. 334. 1753. 



Coll. : MacMillan & Skinner 158, Maple lake. 



Rumex occidentalis S. WATS. Proc. Am. Acad. 12 : 253. 



1876. 



Coll. : MacMillan & Skinner 270, Thief River Falls. 

 Not previously reported from Minnesota. 



