420 



BOTANY OF CROP PLANTS 



Field or Canadian Field Peas. — These have smooth, hard, 

 rather angular seeds. They are gray-green, gray-yellowish, 

 or gray dotted with purple, blue, rust red or brownish spots. 

 Garden peas are sometimes used as a field crop. 



Fig. 175. — Pea pods showing types and range of variation. D, French can- 

 ning type smooth pea, French Canner; B, large podded wrinkled pea, Pride of 

 Market; F, fleshy or edible podded pea, Melting Sugar. {After Corbett.) 



Field peas are successfully grown only in those regions with 

 a cool growing season, in fact, they will withstand quite 

 heavy frosts. High temperatures accompanied by high 

 relative humidity are decidedly injurious. Excellent crops 

 are grown at 7,000 to 8,000 feet in the San Luis Valley of 

 Colorado. They do well on most types of soil. 



