Cimicifuga. Fig. 2.—Diagram of a longitudinal tangential section

Fig. 2.—Diagram of a longitudinal tangential section of same rhizome, also magnified 6 diameters, showing anastomosing bundles.
a, cork;
b, middle bark;
c, xylem of a bundle;
d, small portion of bundle passing out to supply rootlet.

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