578 IOWA ACADEMY OF SCIENCE 



TAXUS BREVIFOLIA Nutt. Yew. 



Loaves broad and flat, Vo to % inch long. 



No resin ducts. 



Vascular bundles not large, surrounded by a group of round, 

 loosely joined cells; a group of lignified cells present in pith 

 at each side of xylem band. 



No hypodermal cells. 



Epidermal cells very large and spherical, covered by a thick cut- 

 in, cutin deeply mammillated on lower side of leaf; guard cells 

 lignified. 



Palisade parenchyma not deep nor cells so narrow as in case of 

 Taxus floridana. 



Material from University of Washington. 



Plate LXVII. 



Figure 1. — Sections of leaves of Taxus brevifolia. 



Figure 2. — Section through lower epidermis and stoma of 

 loaf of T. brevifolia. 



Figure 4. — Section through vascular cylinder of leaf of T. 

 brevifolia. 



