40 KANSAS UNIVERSITY SCIENCE BULLETIN. 



7. Resin ducts occur adjacent to the veins of stem, leaves 

 and flowers. 



8. The leaf is entered by three vascular bundles, and near 

 the base the tissue between the veins is composed of water- 

 storage parenchyma. 



9. The chloroplast-bearing cells of the mesophyll are not 

 differentiated into palisade and spongy parenchyma. 



10. In the phloem of the stem there is no differentiation into 

 sieve tubes and companion cells, and irregular patches of thin- 

 walled phloem cells show more or less lignification of the walls. 



11. In the stem the cell walls of the conspicuous endodermis 

 are suberized, excepting from one to three cells that border the 

 thin-walled parenchyma of the pericycle standing between the 

 bundles of bast fibers. These uncutinized passage cells of the 

 endodermis are undoubtedly places where translocation of ma- 

 terials takes place between the outer and inner bark. 



12. The stem is made strong by a large development of 

 wood, bast and collenchyma. 



The material selected for this investigation was obtained 

 from Scott county, Kansas, in midsummer, at the height of the 

 flowering season. The study of the anatomy was carried on in 

 the research laboratory of the botanical department of the 

 University of Kansas, under the direction of Prof. W. C. 

 Stevens, to whom his student gratefully acknowledges her ap- 

 preciation of his help and interest. Thanks are due to Mr. L. 

 M. Peace, preparator and demonstrator in the botanical labora- 

 tory, for his invaluable suggestions and assistance during the 

 progress of the investigation. 



