316 ; PHARMACEUTICAL BOTANY 
5S ~ 69) fo ) 
— 
Fic. 237.—Indian Corn grain and seedling. 1, Median longitudinal section 
through lesser diameter of grain of corn showing fruit wall (pericarp) and adher- 
ent seed coat (spermoderm) p + 5; horny endosperm (end!); starchy endosperm 
(end”); palisade layer (pal) scutellum (s) with vascular tracts (v); cotyledonary 
sheath (cot); radicle (r) and plumule (pl). 2. Transverse section of a representa- 
tive portion of outer region of corn grain showing pericarp (#) and spermoderm 
(s) with tube cells (¢.c.); endosperm (end) with an outer layer of aleurone cells 
containing aleurone grains (a/) and an inner starch parenchyma zone (st). 3. 
Young seedling showing first leaves (/); primary root (r) bearing secondary roots 
(sr) with root hairs (A); cotyledonary sheath (cs) and seed coat (s). 
