Cimicifuga. Fig. 6.—Section showing central part

Fig. 6.—Section showing central part

Fig. 6.—Section showing central part of an older root in which the secondary changes have made further progress. Magnification, 110 diameters.
a, parenchyma cell of cortex;
b, cell of endodermis;
c, phloem;
d, meristem now traceable as a cambium zone;
e, outer extremity of xylem ray;
f, starch-bearing cells formed beneath pericambium;
g, cambium opposite outer end of xylem ray;
h, new ducts in process of formation, the beginning of the secondary xylem.

This image is from Structure of Cimicifuga in the American Journal of Pharmacy, 1895.