KEY TO THE ORDERS xili 



Hypanthiutn cup-shaped or campanulate : disk obsolete or 



inconspicuous. Order Myrtales. 220 



ff. Ovary inferior, 

 j. Stamens numerous. 

 Styles and stigmas united into a disk : water-plants with endog- 

 enous stems. Nymphaeaceae in Order Rosales. 157 

 Styles distinct, or united, but not forming a disk with radiating 

 stigmas : land-plants with exogenous stems. 

 Styles distinct. Families in Order Rosales. 157 

 Styles united. 



Shrubs or trees ; not succulents, sometimes woody vines. 

 Hypanthium not produced beyond the ovary. 



Hydrangeaceae in Order Rosales. 157 

 Hypanthium produced beyond the ovary. 



Families in Order Myrtales. 220 

 Herbs, or shrub-like or tree-like, succulents. 



Order Opuntiales. 219 

 jj. Stamens not more than twice as many as the petals. 

 Styles wanting : stigmas sessile. 



Haloragidaceae in Order Myrtales. 220 

 Styles present. 

 Styles distinct. 



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

 or a fleshy many-seeded berry. 

 Fruit, if dehiscent, valvate. Families in Order Rosales. 157 

 Fruit circumscissile. 



Portulacaceae in Order Chenopouiales. 118 

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



2-5 more or less united achenes. Order Umbellales. 225 

 Styles united, or single. 

 Plants without tendrils. 

 Ovary enclosed in or surpassed by the hypanthium, or ad- 

 nate to it. 

 Anther-sacs opening by pores. 



Vacciniaceae in Order Ericales. 235 

 Anther-sacs opening by slits. 



Ovule solitary in each cavity of the ovary. 



Order Umbellales. 225 

 Ovules several in each cavity. 



Families in Order Myrtales. 220 

 Ovary exceeding the hypanthium, the top free. 



Hydrangeaceae in Order Rosales. 157 

 Plants with tendrils. 

 Herbs : fruit a pepo : leaf-blades palmately veined. 



Cucurbitaceae in Order Campanitlales. 298 

 Shrubby vines : fruit drupaceous, separating into nut- 

 lets : leaf -blades pinnately veined. 



Rhamnaceae in Order Rhamnales. 206 

 ee. Petals more or less united, 

 k. Ovary superior. 

 1. Stamens free from the corolla. 



Gynoecium of a single carpel. Families in Order Rosales. 157 



