VARIOUS FOOD-PLANTS 



61 





Flo. 59, I. — ^^Jerusaleiii Articliokc. (HiUanthus iuberosus, Sunflower Family, 

 C<imposit<B). Stem-tuhers at Ijasc of stem, producing slender roots. 

 (Vilmorin.) — The plant is a perennial herb, often 2 m. in height, closely 

 resembling an ordinary garden sunflower. 



Fig. 59, II. — Jerusalem Artichoke. Flower-cluster cut vertically to show^ 

 arrangement of the perfect florets forming a central mass or "disk," 

 the neutral ray-florets surrounding them, and the protecting bracts 

 or "involucre" looking like a calyx outside of all; the whole growing 

 from the so-called "receptacle" or expanded top, of the floral stalk. 

 (Baillon.) — Such a compact cluster of two kinds of flowers looks like one 

 huge flower, and consequently becomes very attractive to many insects 

 which transfer its pollen advantageously. 



