Fig. 295. Powdered Senna (India).
(X 183.) A, Epidermis, surface view. B, Part of transverse section of leaf. C, Trichomes. D, Water tubes. E, Crystal fiber. F, Parenchyma cells containing prisms of calcium oxalate. G, Aggregate crystals of calcium oxalate.
This image is from Drug Powders (also see Senna) in Sayre's Manual of Organic Materia Medica and Pharmacognosy, 1917.