4i8 



THE STRUCTURE OF ECONOMIC PLANTS 



deeply notched with about ten teeth which correspond to the 

 principal veins. On their outer surfaces, characteristic stellate 

 hairs are developed along the ridges formed by the vascular bundles. 

 Bracteoles may occur inside of the involucre alternating with the 



Fig. xiz. Habit of mature bolls. (Photograph by J. Horace McFarland Co.) 



bracts. Frequently, only two are present; and, in this case, they 

 are located on either side of the small bract. 



ANATOMY 



The Seed. — The seeds are irregularly pear-shaped, ranging 

 in length from K to 3^ inch, and they are usually covered with 

 fibers of two kinds, the commercial fiber or "lint" and the "fuzz" 



