EXPLANATION OF THE ILLUSTRATION 
Piate IV. Diagrammatic cross-sectional representa- 
tions of various axes to show structure, vasculariza- 
tion, pubescence, and distribution of an extremely 
small type of cell. The last is indicated by cross- 
hatching, while the phloem-region of the vascular 
bundles is indicated by solid black. 1, pulvinus and 
associated axis from a tassel branch of P39 sweet corn. 
2, rachis with cupule from the distichous branch of 
a teosinte derivative of Guarany maize. 3, the shank 
associated with the spike of fig. 2. 4, the rachis of a 
12-rowed ear of tunicate Argentine popcorn showing 
three cupules. 5, pistillate rachis of Nobogame teo- 
sinte. 6, pistillate rachis of Tripsacum dactyloides. 
All about fifteen times natural size. 
Drawn by Wariron C, GALINAT 
[ 18 | 
