Fig. 204. Spigelia - Cross-section of rhizome.

Fig. 204. Spigelia - Cross-section of rhizome.

(21 diam.) A, Parenchyma of cortex. B, Medulla. C, Xylem. (Photomicrograph.)

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