26 
BULLETIN 365, U. S. DEPARTMENT OP AGRICULTURE. 
circle. The pericycle is similar to that of Delphinium, but is dis- 
tinguished by the fact that there are several layers of thick-walled 
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Pig. 4. — A. Diagram of cross-section of stem of group 6. B. Diagram 
of fibro-vascular bundle of group 6 
cells continuous with the interfascicular sclerenchyma, separating 
the bast from the cortex. The cross section of the fibrovascular 
