388 BOTANICAL GAZETTE [NOVEMBER 
Fic. 6.—R. setosus Bigel.: transverse section of anther showing morpho- 
—— aa pollen; 125. 
G. 7.—R. fruticosus L.: transverse section of anther showing morpho- 
ak perfect pollen; 12 x 
Fic. 8.—R. amnicolus Blanch.: transverse section of anther showing 
pecdaledials perfect pollen; 125. 
‘R. frondosus Bigel.: transverse section of aches showing pollen 
to MR acl sterile; X125. 
Fic. 10.—R. frondosus Bigel.: more highly magnified view of fig. 9; X 300 
Fic. 11.—R. biformispinus Blanch.: transverse section of anther dunia 
large percentage of sterile pollen; 125. 
Fic. 12.—R. Andrewsianus Blanch.: transverse section of anther showing 
large percentage of sterile pollen; 125. 
1G. 13.—R. tardatus Blanch.: transverse section of anther showing large 
percentage of sterile pollen; 600 
Fic. 14.—R. deliciosus: transverse section of anther showing morpho- 
logically perfect pollen; 125. 
1G. 15.—R. multiformis: transverse section of anther showing large per- 
centage of sterile pollen; 125. 
Fic. 16.—R. spectabilis plena: transverse section of anther showing large 
percentage of sterile pollen; 125 
Fic. 17.—R. nobilis: transverse section of anther showing large percentage 
of sterile pollen; X 125. 
Fic. 18.—R. nobilis: more highly magnified view of fig. 17; 300. 
