Wheeler : FLORA OF SOUTHEASTERN MINNESOTA. 415 



Senecio aureus L. Sp. PI. 870. 1753. 



Coll. : Lyon 54, Winnebago. June. 

 Arctium minus SCHK. Bot. Handb. 3: 49. 1803. 



Coll. : Wheeler 432, Jefferson. July. 

 Carduus lanceolatus L. Sp. PI. 821. 1753. 



Coll.: Lyon 242, Crooked Creek. July. 

 Carduus discolor (MUHL.) NUTT. Gen. 2 : 130. 1818. 



Coll. : Lyon 377, Jefferson. Aug. 



Carduus odoratus (MuHL.) PORTER. Mem. Torr. Club, 5: 

 345. 1894. 



Coll. : Herb. Wheeler 25, Winnebago. July. 



DESCRIPTION OF PLATE XXI. 



A. Juniper point, Crooked creek valley. Southwest side of bluff 

 dotted with junipers and white birch. 



B. Base of bluff, upper Winnebago valley. White pine, juniper 

 and white birch along the upper edge of cliff. 



PLATE XXII. 



A. Western slope of bluff. The woods follow the areas of greatest 

 moisture i. ?., the ravines and foot of bluff and the water course in the 

 valley. The shrubs in the valley mark the course of a small creek 

 and are principally willows and dogwoods. 



>. Southern slope of bluff showing the steep bare slopes and the 

 thickly wooded ravine. The extreme base of the bluff to the left has 

 been cleared of timber for cultivation. 



PLATE XXIII. 



A. Grove of white birch. 



B. Swamp vegetation. Spathyema growing in the shade of black 

 ash and yellow birch. 



PLATE XXIV. 



A. Group of coffee trees (Gymnocladus). 



B. White birch and juniper on side of bluff. 



PLATE XXV. 



A. Slough and island vegetation. Sagittarias and Nelumbo are 

 the most prominent water plants, and willows and cottonwood on the 

 island in the background. 



B. General view of river valley from bluffs on Minnesota side of 

 river. The river channel is on the farther side at the base of the Wis- 

 consin bluffs. 



