Fig. 239. Valerian - Cross-section of rhizome.

A, Cork cells. B, Collenchyma. C, Cortical parenchyma. D, Endodermis. E, Small irregular liver-cells. F, Medullary rays. G, Punctuated vessels of wood-rays. H, Pith-cells.

This image is from Valerian in Sayre's Manual of Organic Materia Medica and Pharmacognosy, 1917.