1C 



Yearbook^ of Agriculture 1949 



DETAILS OF SEEDS 



Above: A pine seed: A, seed with wing; 

 B, detached wing; C, cross section of a seed 

 showing embryo (a) surrounded by an 

 endosperm (6), which is filled with storage 

 food, and in turn surrounded by the seed 

 coat (c); D, excised embryo with a tuft of 

 seed leaves. 



Opposite: A dewinged Douglas-fir seed 

 in cross section. 



Below: Seeds of several types: A, white 

 fir, dewinged seed, borne in cones; B, silk- 

 tree, seeds borne in pods; C, common 

 spicebush, seeds borne in fleshy drupes; 

 D, common buttonbush, 2 to 4 nutlets 

 borne in dry, podlike fruits. 



