PLATE 27 







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160 



163 



162 



160. Iponuea cm-i-ini-n. Section of upper epidermis at base of mature leaf ; over a vein, showing long papilla? along veins. 



161. Ipomcea guamoclit. The same, showing no papilla? over veins. 



162. Ipomcea sloteri. The same, showing smaller papillae along vein and that the stomata are slightly more 



numerous at the veins. 



163. Ipomtjea coccinea. Section of epidermis at base of filament showing short glandular shaggy hairs. 



164. Ipoiiioca (juamoclit. The same, showing much longer glandular shaggy hairs. 



165. Ipomoea sloteri. The same, showing glandular shaggy hairs of intermediate length. 



