XVI KEY TO THE OEDEES. 



Ovary 1-celled. Order Primdlales. 



Ovary several-celled. 



Upper portion of the ovaries distinct. 



Sedaceae in Order Rosales. 

 Upper portion of the ovaries united. Order Ebenales. 



Stamens as many as the lobes of the corolla and alternate with them, 

 or fewer. 

 Corolla not scarious, veiny : fruit various, but not a pyxis. 

 Gynoecium of 3-6 carpels. 



Shrubs or trees : ovules and seeds few. 



Aquifoliaceae in Order Sapindales. 

 Herbs, or creeping or tufted shrubby plants : ovules and 

 seeds numerous. Families in Order Polemoniales. 



Gynoecium of 2 carpels. 



Carpels distinct, except sometimes at the apex. 



Order Asclepiadales. 

 Carpels united. 



Ovary 1-celled, with central placentae. 



Order Gentianaies. 

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

 parietal placentae. 

 Stamens 2 and opposite each other, or 3. 



Order Oleales. 



Stamens usually 4 or 5, if 2 by reduction not opposite 



each other. 



Leaves with stipules or stipular lines at their bases. 



Spigeliaceae in Order Gextianales. 



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 unmodi- 

 fied, 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 Primulales. 

 Ovule solitary, the placentae not basal. 



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



Order Valerianales. 

 Flowers in involucrate heads. Order Carduales. 



