Veratrum. Fig. 3. Portion of cross-section of root

Fig. 3.—Portion of cross-section of root, showing central radial bundle and a little of the surrounding cortex.
a, cell of cortical parenchyma;
b, endodermal cell opposite phloem mass;
c, small duct at outer end of xylem ray;
d, large duct at inner end of xylem ray;
e, phloem mass.
Magnification, 230 diameters.

This image is from Structure of Veratrum viride in the April issue of the American Journal of Pharmacy, 1895.