64 EDITH SCHWARTZ CLEMENTS 



XEROPHYTA 



Bursa bursa-pastoris 



HALF GRAVEL: light i; available water 4.5-7.5%; humidity 30- 

 65%; temperature 5i-76: diphotophyll 175/4; epidermis 20/1; 

 cuticle 2 p.; chlorenchym ( 135/0 3 compact rows globose to prolate 

 palisade cells 25 p. ; close globose to oblate sponge cells. 



BROOK BANK THICKET: light o.on; available water 18-20%; 

 humidity 60-85% '> temperature 47-69 : diphotophyll 225 p.; lower 

 epidermis 10 p, with flattened elongated cells ; cuticle thin ; chlor- 

 enchym (195/1) i loose row broad subglobose and prolate palisade 

 cells 50 p., and second row of large globose to oblate cells 25/1; 

 loose oblate sponge cells. 



Half gravel C. 1351* P. 3 rows, 75 M S. 60 M 



Brook bank C. 195 ft P. 2 rows, 75ft S. 120 ft 



-fobft i row, o + 60 ft (100%) 



Light i/ioo; water -f- 1 3% ', humidity +(20-30%) ; temperature 



-(4-7). 



Potentilla propinqua 



HALF GRAVEL: light i; available water 4.5-7.5%; humidity 30- 

 65%; temperature 5i-76: diphotophyll 150/4; epidermis, upper 

 25 p., lower 15 p.; cuticle 2 p.; chlorenchym (115/1) 2 loose rows pro- 

 late palisade cells 35 p. ; globose sponge cells. 



THICKET SHADE : light 0.06 ; available water 16% ; humidity 40- 

 70% ; temperature 48-72 : diphotophyll 150/1; cuticle thin; looser 

 palisade ; loose oblate sponge cells. 



The cuticle is thinner and the chlorenchym tissues looser; other- 

 wise there is no variation from the type. 



Light 1/16; water +(8.5-11.5%); humidity +(5-10%) ; tem- 

 perature (3-4). 



Blitum capitatum 



HALF GRAVEL: light 0.8; available water 4.5-7.5% ; humidity 30- 

 65%; temperature 5i-76: diphotophyll 275/1; epidermis, upper 

 20 p., lower 15/1; cuticle thin; chlorenchym (240/1) 2-3 compact 

 rows prolate palisade cells 50 p. ; loose irregular sponge cells. (Plate 

 VII, fig. 6 a.) 



BROOK BANK THICKET: light o.oii; available water 18-20%; 

 humidity 60-85%, temperature 47-69 : diphotophyll 100/1; epi- 



