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SCIENTIFIC AND APPLIED PHARMACOGNOSY 



FIG. 138. Rosa Gallica: A, surface view of the ventral or upper surface of petal, 

 showing polygonal cells, the radiating line indicating the folds formed by 

 the papillae. B, surface view of cells on the dorsal or lower surface of the 

 petal with inner projections being sometimes of a T-shape. C, cross-section 

 from the middle of the petal, showing the upper epidermal cells with papillae 

 (t;), loose mesophyll cells (TO), some of which contain small crystals of calcium 

 oxalate (A;) and starch grains (st) ; and cells of lower epidermis in which the 



