76 
PHARMACEUTICAL BOTANY 
origin from meristematic cells of the embryo. Elongating with the 
growth of the plant, they branch in various directions and traverse 
Fig. 26. — Laticiferous vessels from the cortex of root of Scorozonora hispanica. 
A . As seen under low power, and B, a smaller portion under high power. (Stevens, 
after Sachs.) 
at maturity all of its organs. Such cells are abundant in the 
following families: Apocynacece, Asclepiadacece, Urticacece and 
Euphorbiacea. 
