680 SCIENTIFIC AND APPLIED PHARMACOGNOSY 





End 



ha. 299. Grindelia squarrosa: A, transverse section of a portion of the stem, 

 showing a large resin canal bordering on the endodermis (End). B, trans- 

 verse section of a portion of a leaf showing the epidermal cells (Ep), and a 

 large sessile glandular hair, in the depressed epidermal layer. C, surface 

 view of a glandular hair, situated in a wide cavity of the epidermis. D, 

 surface view of the epidermal cells from the dorsal surface of the leaf, showing 

 a small group of stomata. E, transverse section of the dorsal layers of the 

 leaf, showing the epidermal cells (Ep), having thick outer walls and 2 of the 

 stomata; palisade cells (P); and part of the water-storage tissue (A). F, 

 transverse section of part of a midrib of the leaf; Coll, collenchyma; B, a 

 resin canal; St, the stereomatic pericycle. After Holm, Merck's Report, 

 1910, p. 310. 



