PLATE 28 



166 



1G7 



'T^-iKO r 1 K ; '? ' *mf ' 



Wm&wm vl 

 !iS'MK 





170 



r ' I % kjJr ^^H^SL%- 



^^KX, ^rt- '"fr ~ *- j^- ^f? 



;. , , , */-4s^jfS,J^- ^TL*^ 



* , ? '*'' ^irc*^* 



r >>i^Pteafe. 



Jb H r . aPi W^. ~ w , 



100. Ipomna coccinea. Transverse section; petiole of mature leaf equidistant from (lie lamina and the base. 



167. Ipomcea quamoclit. The same. 



168. Ipomcea sloleri. The same. 



161). I pumaca coccinea. Multicellular iirotulierances at base of petiole. 



170. / iioniH'ii quamoclit. The same. 



171. 1 [iinnn-a sloteri. The same. 



