AND TH£ DISTRIBUTION OIT THE STOMATA. 115 



Ixroiip 1. ^. 

 Trifolium. 



Stomata Taking the stomata on 



the lower surface = 100. 



T. Auchcri -- — 



8 100 



T.eWans ^^ ^^ 



^ 72 100 



T.Lupinaster jB 11!? 



T. medium ^ ± 



8 100 



T.miau3 i l^ 



y2 100 



T* 86 90 



.pannomcum ^^ - 



m ^ 95 98 



T. pratense ^^ -r— 



^ 97 luo 



T-«tnatum | Ji? 



Two species have all the stomata below. Omitting the.^e, the 

 average stomatal formula is .—-. 



roup 11. 7-.. 



Q . Taking the stomata on 



fetomata. ^,^^ ^^^^^ 8urface=100. 



T. alpeatre — ^- 



rn •. 72 206 



T, cfespitosuni — ■ jrr^ 



rji - .p 100 180 



T.fragiferum — j^ 



T. montanum ^ Y^ 



« 160 iri3 



T. repens ^ j^ 



T. uniflorum 2^ j^ 



One species {aljyestre) has all its stomata on the upper surface 



— the reverse of what holds good in Group i. ^, where two species 



have all their stomata below. Omitting T, alpestre^ the average 

 . 227 



Thus, when the bloom is on the upper surface only, the average 

 number of stomata on the upper surface (as compared with the 

 lower) is twice as great as in those cases where both surfaces are 

 covered with bloom. 



LINK. JOVni!!i. BOTANT, VOL. XXIT. K 



