FLOWERS. 



109 



PLATE XLV11. 



FIG. 57. Powdered Santonica (x 240). 



eb, Epidermis of the membranous wings of the bracts 

 e'b', Epidermis of the central portion. 



ec, Epidermis of the corolla tubes. 

 fp, Fibrous cells from pericycle. 

 go, Oil-gland, surface view. 



g'o', The same in profile. 



h, Cells of the hypoderma. 



p, Hairs from central portion of bract. 



pa, p'a', Parenchyma of the bracts. 



po, Pollen grains. 



st, Stomata. 



ti*, v. Elements of fibro-vascu}ar bundle. 



