KEY TO THE ORDERS xv 



Stamens 5 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 Santalales. hi 



Ovules variously borne, but not pendulous from a basal 



placenta : plants not parasitic. Order Rubiales. 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. 29S 



