76 EDITH SCHWARTZ CLEMENTS 



cuticle 5/1; chlorenchym (210/1) I close row of prolate cells 60/1 

 next to upper epidermis, and I row 40/1 next to lower epidermis; 

 central close subglobose and prolate cells. 



FOOTHILL THICKET: light 0.0125 ; available water 11% ', humidity 

 38-80%; temperature 53-85 : leaf 225/4; epidermis 30/1, wavy; 

 chlorenchym (165/1) upper cells 50/1, lower ones 25/1. 



The leaf has become thinner. 



Light i/So; water +(7-9%); humidity +(3-10%); tempera- 

 ture 4. 



Senecio rosulatus 



FOOTHILL GRAVEL: light i; available water 2.5-5.5%; humidity 

 28-77%; temperature 57-8o. : diplophyll 325/1; epidermis 25/1; 

 cuticle 5/1; chlorenchym (275/1) I close row of prolate cells 50/1, 

 next to upper, and I looser row 30 /t, next to lower epidermis ; cen- 

 tral globose and prolate cells. 



FOOTHILL ROCK (dwarf) : available water 3%, other factors the 

 same : plant dwarfed, leaf small, 275 /i ; central cells more prolate. 



FOOTHILL SHADE: light 0.0125; available water 11%; humidity 

 38-80% ; temperature 53-85 : leaf larger 450/1; upper cells 60/1, 

 lower ones 40/1; more loosely arranged. 



Light 1/80; water +(7-9%); humidity +(3-10%); tempera- 

 ture 4. 



Thlaspi coloradense 



SUBALPINE GRAVEL: light i ; available water 2.5-5.5% ; humidity 

 30-65%; temperature 5i-76: staurophyll 500/1; epiderimis, 

 upper 50/1, lower 40/1; cuticle 6/*; chlorenchym (410/1) close 

 chains of subglobose and prolate cells 35-75 /i, the longer next to 

 upper epidermis. 



ALPINE THICKET : light o.oi ; available water 25-30% ; humidity 

 40-60% ; temperature 4O-65 : leaf 275/1; epidermis wavy, upper 

 40/1, lower 25/1; cuticle 3/1; chlorenchym (210/1) lacunose chains 

 of subglobose and prolate cells 25-65 /i. 



Gravel C. 410 M 



Thicket C. 210 v- 



200 M 



Light i/ioo; water +(22-25%); humidity the same; tempera- 

 ture 11. 



