EXPLANATION OF THE ILLUSTRATION 
Piare Il. The vascular systems in the pistillate rachis 
of the American Maydeae in three-dimensional aspect. 
For simplicity, only that vascularization which is in the 
outer glume of the spikelet and in the rachis tissue ad- 
jacent to the observer is shown. Individual lines rep- 
resent individual bundles except in the main bundles 
which are thicker and shaded when overlapped by other 
tissue, such as that of glumes and rind. 
1. Vascularization of the maize-type rachis as repre- 
resented in simplified form by a derivative from a maize- 
teosinte hybrid. A slight degree of twisting has been 
incorporated into the drawing in order to illustrate the 
vascular arrangement from several angles. 
2, 3. Separate front and side views of the fruit case 
of Durango teosinte. 
4, 5. Separate front and side views of the fruit case 
of Tripsacum dactyloides. 
All about five times natural size. 
Drawn by Warton C, GaLinatT 
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