KEY TO THE ORDERS xiu 



Hypanthium 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 Myrtai.es. 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 Myrtai.es. 220 

 Styles present. 

 Styles distinct. 

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

 or a fleshy many-seeded berry. 

 Fruit, if dehiscenti'valvate. Families in Order Rosales. 157 

 Fruit circumscissile. 



*" Portulacaceae in Order Chenopodiales. 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 Campanulales. 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 



