Wheeler: FLORA OF SOUTHEASTERN MINNESOTA. 381 



Salix fluviatilis NUTT. Sylva, i : 73. 1842. 



Coll.: Wheeler 136, Winnebago ; 333, Crooked Creek. 

 June, July. 



Salix bebbiana SARG. Gard. & For. 8 : 463. 1895. 

 Coll. : Wheeler 343, Crooked Creek. July. 



Salix humilis MARSH, Arb. Am. 140. 1785. 

 Coll. : Wheeler 181, Winnebago. June. 



Salix discolor MUHL. Neue Schrift. Ges. Nat. Fr. Berlin, 4 : 



234.^7. 6. f. i. 1803. 



Coll.: Wheeler 138, Winnebago; 334, Crooked Creek. 

 June, July. 



BETULACE^E. 



Carpinus caroliniana WALT. Fl. Car. 236. 1788. 

 Coll. : Lyon 56, Winnebago. June. 



Ostrya virginiana (MILL.) WILLD. Sp. PL 4: 469. 1805. 

 Coll. : Wheeler 200, Winnebago. June. 



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

 Coll. : Wheeler 22, Winnebago. June. 



Corylus rostrata AIT. Hort. Kew. 3: 364. 1789. 



kColl. : Wheeler 223, Winnebago ; 275, Crooked Creek. 

 June. 

 Not previously collected from southern part of state. Local 

 on bluffs. 



Betula papyrifera MARSH. Art. Am. 19. 1785. 



Coll.: Wheeler 215, Jefferson. June. 

 Common, dry ridges. (Plates XXIII., A and XXIV., B.) 



Betula nigra L. Sp. PI. 982. 1753. 



Coll. : Wheeler 553, Jefferson. Aug. 

 Common in the lowlands of the Mississippi River. 



Betula lenta L. Sp. PI. 983. 1753. 



Coll. : Wheeler 165, Winnebago. June. 

 Not previously collected in the southern part of the state. 

 Rare. 



Betula lutea MICHX. f. Arb. Am. 2 : 152. pL 5. 1812. 



Coll.: Wheeler 199, Winnebago; 271, Crooked Creek; 



325, Mayville. June, July. 



Frequent in moist locations along Winnebago and Crooked 

 creeks. 



