1912] 



STARR— ANATOMY OF DUNE PLANTS 



285 



Shrubs 



CORNUS STOLONIFERA 



Leaf 



Stem 



M 



T 129M (120-144) 



UE... 17 =13 percent 



X 



156 m 



iS 



10 per cent 



P 



.... 34 = 26 



Sp 56 =44 



LE. . . 22 =17 

 OW... 1.6 

 Cu . . . thin 



48 =31 

 72 =46 



21 



13 



0.8 



N. 



D. 

 W. 

 F.. 

 L.. 

 R. 

 C. 



• « 



M X 



63 70 



30 m (41) 33 M (45) 



• • 



• • 



• • 



3-2 



4.7 



6.4 



1-3 



34 

 S 



6.2 

 2-8 



None except 112 (in 8-year 



at lenticels 



stem) 



A". — Hairs more abundant than in M, 



Epidermal cells when present papillate 



on upper surface radiating from a center and cuticle heavy; cork not formed be- 



parallel to the surface, tuberculate; on fore 5 years. In both small groups of 



lower surface simple or branched; short sclerenchyma in cortex. All points as 



hairs also found, formed as slight pro- in majority. 



longations of most of the lower epidermal 



cells, their cuticle prominently ridged; 



cells of upper epidermis smaller in all 



dimensions; side walls plane (wavy in 



Af); deposits in the form of crystals and 



oil in the cells, and wax on the outer wall; 



other points 

 forms — 



as in most xerophytic 



Figs. 20 and 21. 



20 



Figs. 20, 21. — Cornus stolonifcra: 

 sections of leaves; fig. 20, mesophytic 

 form; fig. 21, dune form. 



21 



