PLATE 29 



r.V, \~*t . I _ 1 1 . 'i *^. i ,WV .-*> V 



174 



177 



172. Ipomaea coccinea. Upper epidermis, limb of corolla. 



173. Ipomaea guamoclit. The same. 



174. Ipomaea sloteri. The same, showing larger cells than in either I. corcineii or /. quamoclit. 



175. Ipomaea coccinea. Lower epidermis, limb of corolla showing slightly wavy cell walls. 



176. Ipomaea quamoclit. The same, showing very wavy cell walls. 



177. Ipomoea sloteri. The same, showing waviness between that of the two parents. 



