78 EDITH SCHWARTZ CLEMENTS 



Gravel . . C. 200 /" P. 4 rows, 160 /* Water cells 40 /i 



Thicket . C. 125/1 P. i row, 40 /i Sponge 85/1 



75 M 3 rows, 120/1 (75%) 



Light i/ioo; water + J 5% ; humidity +(25-30%) ; temperature 



~(7-8). 



Pachylophus caespitosus 



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

 28-77%; temperature 57-89 : staurophyll 475/1; epidermis 25- 

 40/1; cuticle 10 /i ; chlorenchym (450/1) 5-7 irregular overlapping 

 rows prolate cells, first row IOO/A, second 125/1,, third, fourth and 

 fifth 75 {L, sixth and seventh 65 /i ; the first row is loose allowing for 

 stomatal air-chambers, the second and third are compact and the 

 last four are loose and oblobate. (Plate IX, fig. i a.) 



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

 38-80%; temperature 53-85 : diphotophyll 350 /t; cuticle 2/*; 

 chlorenchym (300/4) 2 lacunose rows prolate palisade cells 75 /i; 

 loose irregular sponge cells. (Plate IX, fig. i &.) 



Gravel C. 450 M P. 7 rows, 450 /i S. o 



Thicket C. 300 /i P. 2 rows, 150/1 S. 150 ft 



150/1 5 rows, 3COM (66%) +150/4 



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

 ture 4. 



Senecio spartioides 



GRAVEL: light i; available water 2.5-5.5%; humidity 30-65%; 

 temperature 55~76 : staurophyll 450/1.; epidermis, upper 35/1, lower 

 25 /A; cuticle, upper 7/1, lower 2/1; chlorenchym (390/1) 7 close 

 irregular rows prolate cells 20-100/1; central and lower ones oblo- 

 bate, lowermost and uppermost loose by reason of numerous 

 stomatal air chambers. 



THICKET: light 0.016; available water 15-20%; humidity 40- 

 70%; temperature 48-72 : diphotophyll 375/1; chlorenchym 

 (315/4) 2 lacunose rows prolate cells 75/1; lacunose irregular and 

 prolate sponge cells. 



Gravel C. 390 /i P. 7 rows, 390 M S. o 



Thicket C. 315 M P. 2 rows, 150 A* S. 165/1 



75^ STOWS, 240/1 (61%) +165/1 



Light 1/60; water -(-(12.5-14.5%) ; humidity +(5-10%) ; tem- 

 perature (4-7). 



