LEAF KEY 43 



Plants growing on rocks, bricks, mortar, etc. 



I. SHAPE OF LEAVES WHEN MOIST NOT EASILY SEEN 



(Leave? too small or too closely folded to show if they are relatively long and 

 narrow or short and broad) 



Stems one-half inch long or Icss.^ 



Capsule erect .... 2, 22, 23. 



Capsule not erect .... 25, 28, 34. 

 Stems more than one-half inch long.^ 



Capsule erect .... 21, 22, 23. 



Capsule not erect .... 28, 34. 



IT. SHAPE OF LEAVES WHEN MOIST EASILY SEEN 

 (Leaves must be seen well enough to estimate their relative shape) 



a. Leaves long and narrow (more than four times longer 

 than broadest part) 



Stems one-half inch long or less. 

 Leaves hair-like throughout.^ 



Capsule erect .... 3, 6, 8, 12, 14. 

 Capsule not erect .... 4, 6, 7, 8, 26, 34. 

 Leaves broader, sometimes ending in a hair-like tip. 

 Capsule partly concealed by leaves .... 19. 

 Capsule not concealed. 

 Capsule erect .... 8, 22, 23, 41. 

 Capsule not erect .... 8, 9, 27, 28, 30, 41. 

 Stems more than one-half inch long. 

 Leaves hair-like throughout.^ 



Capsule erect .... 3, 5, 6, 8, 12, 14. 



Capsule not erect .... 4, 6, 7, 8, 26, 32, S3, 34- 



^ See AnJrcaca, p. 75. 



