392 MINNESOTA BOTANICAL STUDIES. 



DRUPACEiE. 



Prunus americana Marsh. Arb. Am. iii. 1785. 

 Coll. : Wheeler 353, Crooked Creek. July. 



Prunus nigra Ait. Hort. Kew. 2: 165. 1789. 



Coll.: Wheeler 321, 354, ]Mayville ; 501, Winnebago. 

 July, Aug. 

 Not previously reported from Minnesota. This species has 

 been recognized by horticulturists in several parts of the 

 state but no previous authentic collections are known to 

 have been made. It is common on the lowlands of the 

 North and South forks of Crooked creek. Also col- 

 lected on the banks of Winnebago creek and in East 

 Burns valley, Winona county. 



Prunus virginiana L. Sp. PL 473. 1753. 



Coll. : Wheeler 345, Crooked Creek. July. 



Prunus serotina Ehrh. Beitr. 3: 20. 1788. 

 Coll. : Wheeler 178, Winnebago. June. 



CiESALPINACEiE. 



Cassia chamaecrista L. Sp. PI. 379. 1753. 

 Coll. : Lyon 256, Jefferson. July. 



Gleditsia triacanthos L. Sp. PL 1056. 1753. 



Coll. : Lyon and Wheeler; 413, W. Jefferson. July. 

 Not previously reported from Minnesota. This tree has been 

 frequently cultivated for ornament throughout the southern 

 part of the state but no native trees have previously been 

 reported. It is frequent on the islands of the Mississippi 

 river in northeastern low-a and extends north along the 

 river into Houston county, Minnesota, where it probably 

 reaches its northern limit. The tree from which the col- 

 lection was made is 59 feet high and has a trunk-circum- 

 ference of 6 feet, 3 feet from the ground. 



Gymnocladus dioica Koch, Dendrol. 1:5. 1869. 



Coll.: Lyon 193, 230, Crooked Creek; 271, Jefferson. 

 July. (Plate XXIV., A.) 



PAPILIONACEiE. 

 Baptisia bracteata Ell. Bot. S. C. & Ga. i : 469. 1817. 



Coll. : Wheeler 94, Lyon 34, Winnebago ; Lyon 202, 

 Crooked Creek. June, July. 



