VARIOUS FOOD-PLANTS 61 
Fic. 59, I1.—Jerusalem Artichoke. (Helianthus tuberosus, Sunflower Family, 
Composite). Stem-tubers at base of stem, producing slender roots. 
(Vilmorin.)—The plant is a perennial herb, often 2 m. in height, closely 
resembling an ordinary garden sunflower. 
Fic. 59, I1.—Jerusalem Artichoke. Flower-cluster cut vertically to show 
a 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. 
