VARIOUS FOOD-PLANTS 



63 



Fig. 60. — Onion. (Allium Cepa, Lily Family, Liliacew). A, bulb at the 

 beginning of the second year's growth (S) cut to show the short stem 

 from which roots spring below, and, above, last year's leaves of wliich 

 there remain only the thickened bases forming the "coats of the onion " 

 and filled with food now being used up by the new leaves developing 

 from a bud at the center. B, upper part of a leaf cut to show its tubular 

 form. C, plant toward the end of its second year (i) ; the upper (once 

 green) part of the leaves having withered, are replaced by a green 

 hollow stena (shown cut across at D) w^hich bears a cluster of white 

 flowers, and finally the fruit. (A, original; B, C. D redrawn from 

 Reichenbach.) 



