INDEX TO AMERICAN BOTANICAL LITERATURE 333 
Wylie, R. B. Concerning the capacity of foliage leaves to 
withstand wounding. Proc. Iowa Acad. Sci. 28: 293-304. 
f. 49-54. gal. 
Wylie, R. B. Submarginal venation of foliage leaves. Proc. 
Iowa Acad. Sci. 29: 233-237. f. 1. 1922. 
Wylie, R. B. Some wound responses of foliage leaves. Proc. 
Iowa Acad. Sci. 29: 238-244. f. 1-6. 1922. 
Wylie, R. B., & Yocum, A. E. The endosperm of Ufricularia. 
Univ. Iowa Stud. Nat. Hist. 10: 3-18. pl. 1-6. 1 My 1923. 
Yeager, A. F., & Heath, F. M. Perennial flowers for North 
Dakota homes. N. Dak. Agr. Exp. Sta. Bull. 170: 1-56. 
f. 1-26. D 1923. 
Youngken, H. W. Animal-eating plants. Pop. Sci. Talks 1:: 
136-157. f.I-II. 1923. 
Yuncker, T.G. The genus Cuscuta in Michigan. Pap. Michi- 
gan Acad. Sci., Arts & Lett. 1: 185-189. F 1923. 
Yuncker, T. G. Revision of the South American species of 
Cuscuta. Am. Jour. Bot.9: 557-575. 
Includes 6 new species. 
Zimmermann, W. Zytologische Untersuchungen an Sphacelaria 
fusca Ag. Ein Beitrag zur Entwicklungsphysiologie der 
Zelk. Zeits. Bot. 15: 113-175. f. I-7- 1923. 
