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noted that in Zufa and other members of the Cucurbiteae, 
and in Coccinia and MMelothria, the early condition of the 
placentae is uniform, but a differentiation soon appears which 
distinguishes one from another. Certain outgrowths from the 
Fic. 6. Placentation. 4 to D, Cucurbita Pepo, showing origin of ovules 
and their comparative development on the same placenta, D. F, Coc- 
cinta. G, H, Micrampelis. I, J, Sityos. K, Cyclanthera. 
placental flanks mark the point at which the ovules arise. 
This is shown clearly in the case of ZLzujffa, and also in 
Lagenariaand Cucurbita. In Luffa and Cucumis two ovules 
arise on each flank, but in Lagenaria, Crtrullus, and Cucur- 
éc¢a the number varies from two to several. 
