KEY TO THE ORDERS xv 



Stamens s or fewer : anther-sacs opening by longitudinal slits. 



Order Campanulales. 298 

 Stamens adnate to the corolla, 

 n. Ovary with 2-many fertile cavities and 2-many ovules : calyx 

 unmodified, at least not a pappus. 

 Plants tendril-bearing. 



Cucurbitaceae in Order Campanulales. 298 

 Plants not tendril-bearing. 

 Ovules mainly pendulous from a basal placenta : plants 



parasitic. Order Santalalks. hi 



Ovules variously borne, but not pendulous from a basal 



placenta : plants not parasitic. Order Rcbiales. 289 



. nn. Ovary with one fertile cavity. 



Ovules numerous on a basal placenta. 



Primulaceae in Order Primulales. 243 

 Ovule solitary, the placentae not basal. 

 Flowers not in heads, often in head-like spikes or racemes. 



Order Valerianales. 297 

 Flowers in involucrate heads. 



Families in Order Campanulales. 298 



