PLATE 26 



%, 



164. I-pomwa cocdnea. Section of upper epidermis at base of mature leaf, showing numerous stomata, regular dis- 

 tribution of stomata, straight-walled cells, and no hairs. 



155. Ipomcea quamoclit. The same, showing fewer stomata; stomata grouped mainly at veins, wavy-walled cells and 



short dagger-like hairs. 



156. Ipomcea sloteri. The same, showing more stomata than in I. quamoclit, but fewer than in /. cocdnea, moderately 



wavy-walled cells, longer hairs, and larger cells and stomata. 



157. I-pomcea cocdnea. Section of same at margin of leaf, showing protuberances from marginal cells. 



158. I'pomoea quamoclit. The same, showing flat marginal cells, no protuberances. 



159. Ipomcea sloteri. The same, showing smaller protuberances from marginal cells. 



