KEY TO THE OEDEES ix 



Stigmas or styles distinct and cleft, or foli- 

 aceous, or united by pairs. 



Order Euphorbiales. 

 Stigmas or styles all distinct or all united, 

 neither cleft nor foliaceous. 

 Stamens 2. Oleaceae in Order Oleales. 



Stamens more than 2. 



Leaves with compound blades. 



Families in Order Geraniales. 

 Leaves with simple blades. 



Ovule solitary in each carpel. 



Families in Order Geraniales. 

 Ovules 2 or more in each carpel. 



Tiliaceae in Order Malvales. 

 ?+ Stamens inserted on the margin of a disk or hypanthium (perigynous 

 or hypogynous). 

 Stamens as many as the petals and opposite them. 

 Ovules and seeds numerous. 



Moringaceae in Order Papa\-erales. 



Ovules and seeds solitary or 2. Order Rhamnales 



Stamens as many as the petals and alternate with them, or more 



or many. 



Styles distinct. Order Sapindales. 



Styles united. 



Hypanthium flat or obsolete : disk fleshy. 



Plants without secreting glands in the bark. 



„ Order Sapindales. 



Plants with secreting glands in the bark. 



Families in Order Geraniales. 

 Hypanthium cup-shaped or campanulate : disk obsolete or 

 inconspicuous. Order Myrtales. 



ttOvary inferior. 



Stamens numerous. 



Styles distinct. Families In Order Rosales. 



Styles united. Families in Order Myrtales. 



Stamens not more than twice as many as the petals. 

 Styles distinct. 



Ovules several in each cavity of the ovary : fruit a capsule or 



a fleshy many-seeded berry. Families in Order Rosales. 



Ovules solitary in each cavity of the ovary : fruit a drupe or 



2-5 more or less united achenes. Order Ammiales. 



Styles united, or single. 



Ovules solitary in each cavity of the ovary. Order Ammiales. 

 Ovules several in each cavity. Families in Order Myrtales. 

 Petals more or less united. 

 Ovary superior. 



Stamens free from the corolla. 



Gynoecium of a single carpel. Families in Order Rosales. 



Gynoecium of several united carpels. 



Filaments united. Families in Order Ericales. 



Filaments distinct. 



Styles wanting or very short : stigma sessile. 



Aquifoliaceae in Order Sapindales. 

 Styles elongate. Family in Order Ericales. 



Stamens partially adnate to the corolla. 



Stamens as many as the lobes of the corolla and opposite them, or 

 twice as many or more. 

 Ovary 1-celIed. Order Primijlales. 



Ovary several-celled. Order Ebexales. 



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. Aquifoliaceae in Order Sapindales. 

 Gynoecium of 2 carpels. 



Carpels distinct, except sometimes at the apex. 



Order Asclepiadales. 

 Carpels united. 



Stamens 2 and opposite each other, or 3. Order Oleales. 

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

 each other. Order Polemoni.vles. 



Corolla scarious, veinless : fruit a pyxis. 

 Ovary inferior. 



Ovary with 2-many fertile cavities and 2-many ovules : calyx unmodified, 



at least not a pappus. 



Ovules mostly on basal placentae : plants parasitic. 



^ , . , Order Santalales. 



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



parasitic. Order Ruriales. 



Ovary with one fertile cavity. Order Carduales. 



