Xil KEY TO THE OEDERS 



Ovary 1-celled, with central placentae. 



Order Gentianales. 

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

 parietal placentae. 

 Stamens 2 and opposite each other, or 3. 



Order Oleales. 

 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 Gentiakales. 



Leaves with no traces of stipules. 



Order Polemoniales. 

 Corolla scarious, veinless : fruit a pyxis. Order Plan tag in ales. 

 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 Caeduales. 



