KEY TO THE ORDERS 



Gynoeolum of 2 carpels. 



Carpels distinct, except sometimes at the apex. 



Order ASCI.EPIADALES. 

 Carpels united. 



Ovary 1-celled, with central placentae. 



Order GEXTIANALES. 

 Ovary 2-celled. or falsely 4-celled, or If 1-celled with 



parietal placentae. 

 Stamens 2 and opposite each other, or 3. 



Order OLEALCS. 



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

 posite each other. 



Leaves with stipules or stlpular lines at their 

 bases. Splgellaceae In Order GENTIANALCS. 



Leaves with no traces of stipules. 



Order POLEMONIALES. 



Corolla scarlous. vein less : fruit a pyxis. Order PLANT .\> .1- 

 Ovary Inferior. 



Stamens with the filaments free from the corolla. 



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



Vacclnlaceae In Order ERICALES. 

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



Order < \\u-AsrijiLi8. 

 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. Cucurbltaceae In Order CAMPAM I..M i:s. 

 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 RUBIAUBS. 



Ovary with one fertile cavity. 



Ovules numerous on a basal placenta. 



I'rlmulnceae In Order PRIMCLALER. 

 Ovule solitary, the placentae not basal. r CARDUAUM. 



