RELATION OF LEAF STRUCTURE TO PHYSICAL FACTORS 43 



Erigeron leucotrichus (sub-type): staurophyll 350/11; epidermis 

 50 ,/n; cuticle 10/1; chlorenchym (250/1) loose prolate palisade 

 cells 50 p. 



Astragalus adsurgens: leaf 275 /i ; epidermis 40 /t. 



Erigeron elatior. 



Erigeron debilis: leaf 250 /i. 



Aster geyeri: cuticle 5 /i. 



Aster frondosus: leaf 325 /i ; cuticle 5 /i. 



Thermopsis rhombifolia (sub-type): leaf 325/11; epidermis 30/4; 

 cuticle 2 p. ; cells close and uniform. 



Epilobium paniculatum (sub-type) : staurophyll 300/1; epidermis 

 15/1; cuticle thin; chlorenchym (270/4) compact prolate palisade 

 cells 50-75 /i ; scattered water-storage cells. 



Eriogonum alatum: leaf 350/1; epidermis 25 /A; cuticle 2/1. 



Malvastrum coccineum: epidermis 25/4; cuticle 2ft. 



Ambrosia psilostachya (sub-type): staurophyll 175 /*; epidermis 

 25/1; cuticle thin; surfaces wavy; chlorenchym (125/1) loose pro- 

 late cells 30 /i. 



Coleanthus albicaule: leaf 150/1; cuticle 2/1. 



Chrysopsis villosa: cuticle 5 /*. 



PENTSTEMON UNILATERALIS : staurophyll 400 /i ; epidermis 35 /t ; 

 cuticle 7ft; chlorenchym (330/1) close subglobose to prolate palisade 

 cells 30-50/1, arranged more or less regularly. (Plate V, fig. 7.) 



Pentstemon brandegei. 



Pentstemon brandegei prostratus. 



Pentstemon torreyi: leaf 350/1; cells 30-65/1, the longer, as a 

 rule, next to upper epidermis. 



Pentstemon hallii nana: leaf 425 /i. 



ASCLEPIODORA DECUMBENS : staurophyll 300/1; epidermis 25/1; 

 cuticle 5/1; chlorenchym (250/1) regular rows compact prolate 

 palisade cells 40-70/1, the longer next to upper epidermis. (Plate 

 V, fig. 2.) 



Kuhniastera oligophylla: leaf 350/1. 



Allionia hirsuta (transition to Bahia dissecta type) : leaf 350- 

 400/1; palisade cells 4-6 regular rows, the upper 100/1, the 

 lower 50/1. 



BAHIA DISSECTA : staurophyll 700 /i ; epidermis 25 /i ; cuticle 2 /* ; 

 chlorenchym (650 /i) 4-5 close rows prolate palisade cells, the first 

 long and narrow 200 /i, the next 2 or 3 broader, and the last 100 /i, 

 narrow and oblobate. (Plate V, fig. 8.) 



