DoRSEY: VARIATION IN FLORAL STRUCTURES OF VITIS 51 
The variations in the flower of Vitis may be grouped into two 
classes: first, meristic, which would include differences in the 
number of the organs per flower; and, second, functional, including 
variations in the extent of development of the poten, stigma, and 
ovules. 
UNIVERSITY OF MINNESOTA EXPERIMENT STATION. 
LITERATURE CITED 
Beach, S. A. Notes on self-pollination of the grape. N. Y. State 
Exp. Sta. Ann. Rep. 11: 597-606... 1892. 
Beach, S. A. Self-fertility of the grape. N. Y. State Exp. Sta. Bull, 
157: 397-441. 1898. 
Beach, S. A. Fertilizing self-sterile grapes. N. Y. State Exp. Sta. 
Bull. 169: 331-371. 1899. 
Booth, N. O. A study of grape pollen. N. Y. State Exp. Sta. Bull. 
224: 291-302. 1902. 
Chamberlain, C. J. Contribution to the life history of Salix. Bot. 
Gaz. 23: 147-179. pl. 12-18. 1897. 
Durand, E. The tendrils of the grape. Proc. Agr. et Vit. (Ed. L’Est) 
22: 283-295. I901. 
Goebel, K. Organography of plants. Parts I and II. (Cf. p. 528, 
Pt. II.) English translation by Balfour. Oxford, 1905 
Engelmann,G. The true grape vines of the United States. Illustrated 
descriptive catalogue of American grape vines. Fourth edition. 
1-198 (cf. pp. 7-18). 1894. 
Munson, T. V. Investigation and improvement of American grapes. 
Texas Exp. Sta. Bull. 56: 217-285 (cf. p. 245). 1899. 
Explanation of plates 1—3 
PLATE I 
Fic. 1. The perfect flower with upright stamens 
Fic. 2 and 6. The perfect flower with reflexed stamens; FIG. 6, wild Vitis vul- 
pina, ‘ 
Fic. 4and 5. The position of the stamens and corolla in different stages in the 
eres of the grape flower 
Fic. 3 and 5. United oetiie forming the ‘‘cap,”’ also differences in the number 
of foe in the corolla. 
Fic. 7, 8, and 9. Different forms of nectariferous glands in staminate flowers 
PLATE 2 
Fic. 10. hoyle, ok of two — hee the same cane of a Marian X Pock- 
lington cross, sh where only par tially devel oped 
stigmas were present. 
