Smithsonian Report, 1954. — Blaydes 



PLATE 4 



IS, Double coconut, the largest seed known. 16, A photomicrograph of rattlesnake plan- 

 tain seed, among the smallest known. The oval body is an embryo within the seed 

 coat. 17, Cotton seeds. 18, Longitudinal section of a corn grain with the membranous 

 pericarp (P), large endosperm (E), and the embryo {Em). 19, Wheat grains. 20, Rice 

 grains. 



