y 
i 
132 PHARMACEUTICAL BOTANY 
meristematic cells of the embryo. They are arranged in longi- 
tudinal rows and often occur in all of the organs. Each latex 
cell is a single unit and does not anastomose with other latex 
: bem PVH) 
Fic. 72.—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.) 
cells. Such cells are abundant in the following families: 
Apocynaaceea, Papaveracea, Urticacee, Sapotacee and Convolvulacea. 
(2) Latictrerous Vessets are long branching tubes, which 
owe their origin to chains of superimposed cells whose transverse 
walls have early become absorbed, the lumina of the cells then 
becoming filled with latex. They are found in various parts of 
