ON STIPULES 



39 



indications of being tridentate at the apex. These 

 lateral teeth are probably evidence of the former exist- 



us 



LEAVES OF EXOCHORDA. 



FIG. 51. Leaf of Exochorda grandijlora, nat. size. 



FIG. 52. Transverse section of petiole at 3 mm. from base, x 12 ; I7t>, upper 



surface ; W, wing. 



FIG. 53. Leaf of Exochonla Alberti, nat. size ; St, stipule. 

 FIG. 54. Transverse section of petiole at 3 mm. from base, x 12 ; US, upper surface. 



ence of stipules. The petiole of the lower leaves also 

 sometimes shows short teeth at its upper end, which 

 also probably represent the last trace of stipules. 



