144 Guayule. 



DESCRIPTION OF PLATE 30. 



1. Hypocotyl, field seedling for station 2, April 1909, less than 8 months old. 



2. First internode, epicotyl; the primary stereome bundles. 



3. Periderm opposite bundle i in fig. 2. 



4. Periderm opposite bundle 2 in fig. 2. 

 5-11. Trichomes. 



