48 ~ VARIOUS FOOD-PLANTS 
Fic. 
37.—Pea (Pisum _ sativum, 
Pulse Family, Leguminose). 
Plant in flower and fruit, much 
reduced. (Nicholson.)—The 
plant is an annual, climbing by 
means of tendrils which termi- 
nate the leaves;stem and leaves 
pale green, smooth and covered 
with a delicate ‘‘ bloom”’ which 
easily rubs off; flowers, white, 
-bluish, purplish, or variegated. 
. 38.—Pea. A, flower. B, the 
same halved. JB’, corolla, with 
petals separated, showing 
standard (e), wings (a, a), and 
keel (c). C, the stamen-tube 
and pistil, enlarged. D, pistil. 
E, pod shedding seeds. F, a 
seed, showing stalk (f), place 
of minute opening, the mi- 
cropyle, through which mois- 
ture penetrates (mm), raphe or 
ridge (r) and chalaza or end 
of ridge (c); G, embryo, laid 
open, showing cotyledons or 
seed-leaves (c), radicle or seed- 
root (r), caulicle or seed-stem 
(4), and plumule or _ seed- 
bud (g). (Warming.) 
