PASSIFLORALES. 



521 



with parietal placentae (sometimes three or more celled by 

 the produced placentae). 



Order Datiscacese. A curious order of four species, one of which, 

 Datisca glomerata, occurs in California. 



Order BegoniacetB. A tropical order of 350 species of herbs, mostly 

 FIGS. 461-5. ILLUSTRATIONS op CUCUMIS MBLO. 



Fio. 464. 



FIG. 465. 



Fig. 461. Male flower, vertical section. 



Fig. 462. Female flower, vertical section. Fig. 463. Androecinm. Magnified. 



Fig. 464. Diagram of male flower. Fig. 466. Diagram of female flower. 



American, represented in green-houses and conservatories by many 

 species of the principal genus Begonia e.g., B. Rex, B. Evansiana, B. 

 fuchsioides, etc. 



Order Cucurbitacese. The Gourd Family. Herbs or undershrubs 

 with climbing or trailing stems and diclinous flowers ; placentae pro. 

 duced to the axis of the ovary and re volute. Species 470, mostly 

 tropical. (Figs. 461-5.) 



