22 



BULLETIN 465, U. S. DEPARTMENT OF AGRICULTURE. 



summer, and when ripe are brown and nearly half an inch in diame- 

 ter. They are easily crushed, separating into hundreds of thin tri- 



angular seeds. 



Fig. 20. — Delta potato. (Scale is 18 inches long.) B366M 



The tubers are of irregular globular shape and vary up to an inch 

 in diameter. They are formed at the ends of runners (thicker than 

 the fibrous roots) and bear on the side opposite the attachment to the 

 runner a scale-sheathed bud which may be an inch or more in length. 



