Xii KEY TO THE OEDEES 



Ovary 1-celled, with central placentae. 



Order GENIIANALES. 

 Ovary 2-celIed, or falsely 4-celled, or if 1-celled with 



parietal placentae. 

 Stamens 2 and opposite each other, or 3. 



Order OLEALBS. 



Stamens usually 4 or 5, if 2 by reduction not op- 

 posite each other. 



Leaves with stipules or stipular lines at their 

 bases. Spigeliaceae in Order GENTIANALES. 



Leaves with no traces of stipules. 



Order POLEMONIALES. 



Corolla scarious, veinless : fruit a pyxis. Order PLANTAGINALES. 

 Ovary inferior. 



Stamens with the filaments free from the corolla. 



Stamens 10 : anther-sacs opening by terminal pores or chinks. 



Vacciniaceae in Order ERICALES. 

 Stamens 5 or fewer : anther-sacs opening by longitudinal slits. 



Order CAMPANULALES. 

 Stamens adnate to the corolla. 



Ovary with 2-many fertile cavities and 2-many ovules : calyx un- 

 modified, at least not a pappus. 



Plants tendril-bearing. Cucurbitaceae in Order CAMPANULALES. 



Plants not tendril-bearing. 



Ovules mostly on basal placentae : plants parasitic. 



Order SANTALALES. 



Ovules variously borne, but not on a basal placenta : plants not 

 parasitic. Order RUBIALES. 



Ovary with one fertile cavity. 



Ovules numerous on a basal placenta. 



Primulaceae in Order PKIMULALES. 

 Ovule solitary, the placentae not basal. Order CARDDALES. 



