DESCRIPTION OF PLATES. 



Plate I. Dimorphic leaves from adjacent internodes of five plants (A, B, C, D, E) 

 of Ifibiscus cannabinus, two leaves from each plant, the highest of the simple 

 leaves and the lowest of the divided leaves, showing the very abrupt change of 

 form. (Natural size.) 



Plate II. Dimorphic leaves from adjacent internodes of four plants {A, B, C, D) of 

 Hibiscus cannabinus, four leaves from plant A and three leaves from each of the 

 others, showing the more gradual changes of characters. The plant leaves shown 

 in this and the preceding plate were collected from plants grown on the borders 

 of cotton fields at Gizeh, Egypt, July, 1910. (Natural size.) 



Plate III. End of fruiting branch of Egyptian cotton with normal leaves, stipules, 



and involucral bracts. Photograph from living plant grown at Sacaton, Ariz., in 



1910. (Natural size.) 

 Plate IV. End of fruiting branch of Egyptian cotton with abnormally enlarged 



stipules and reduced leaf blades, without lateral lobes. Photograph from living 



plant, Sacaton, Ariz., 1910. (Natural size.) 



Plate V. Hybridization of broad-leaved and narrow -leaved varieties of cotton: 

 ^, Leaf of Keenan variety; i?, Ratteree's Favorite; C, hybrid. Photograph from 

 dried specimens grown by Mr. H. A. AUard at Thompson's Mills, Ga. (Reduced.) 

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