40 
VARIOUS FOOD-PLANTS 
Fia. 
Fic. 
28.—Butternut (Juglans cinerea, Walnut Family, Juglandacee). A twig 
in autumn bearing a single leaf and a ripe fruit. Twig, in spring bear- 
ing two staminate flower-clusters. A single staminate flower viewed 
from above. A pistillate flower showing the two protruding stigmas. 
A nut removed from its husk, showing the deeply sculptured shell. 
The flowers, enlarged; the other parts reduced. (Britton and Brown.)— 
The plant is a forest tree becoming sometimes 30 m. tall; old bark 
roughish, gray; young twigs and leaves sticky-hairy; flowers brownish 
green; stigmas red; fruit green turning to brown, covered thickly with 
very sticky hairs, nut blackish. 
29.—Pecan (Carya oliveformis, Walnut Family, Juglandacee). Twig 
in spring after removal of all the leaves but one and all the staminate 
flower-clusters below it except the lower part of their stalks. At the 
tip of the twig is the small cluster of pistillate flowers. Three-branched 
staminate flower-cluster. Staminate flower, top view. Stamen. 
Fruit. Nut, after removal of the husk. Flower and stamen, enlarged. 
(Britton and Brown.)—The plant is a large slender tree, becoming 
50 m. tall; bark somewhat rough; young twigs and leaves hairy; mature 
foliage nearly smooth; flowers greenish; fruit brownish green; nut 
light brown. 
The native home of the various nuts and of other food- 
plants, the length of time they have been cultivated, and 
certain other matters of related interest, will be discussed 
at the end of this chapter. 
34. Pulse, under which name are included peas (Figs. 37, 
38), and beans (Figs. 39, 40),' agree with grains and nuts 
1TIn the reference to the illustrations the reader will observe that the 
same Arabic numeral sometimes applies to more than one cut, Roman 
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