POTENTILLA 



119 



(b) Pistils in a fleshy urn-shaped recep- 

 tacle, which encloses the nutlets 

 b. Pistils few, (5 or less), free or united with 

 the receptacle, fruit follicles or a pome 



( 1 ) Flowers in flat corymbs, fruit a pome 



(2) Flowers in ample panicles, fruit follicles 

 Leaves simple 



a. Pistils more than one, 3-5 or many 



( 1 ) Pistils on a conical receptacle, fruit an 



aggregation of drupelets 



(2) Pistils in a concave or hollow receptacle, 



free or united with it 

 (a)' Flowers perigynous, fruit dry, 2-5 

 follicles 

 x. Follicles inflated, splitting on both 



sides, seeds shiny 

 y. Follicles not inflated, splitting on one 

 side, seeds dull 

 (b) Flowers epigynous, fruit a fleshy pome 

 x. Carpels cartilaginous or leathery when 

 mature, imbedded in the axis 

 (x) Cavities of the compound ovary 

 as many as styles 

 m. Ovules and seeds 1-2 in each 

 cavity 

 o. Trees; flowers in cymes 

 p. Low shrubs ; flowers in com- 

 pound cymes 

 n. Ovules and seeds numerous in 

 each cavity 

 (y) Cavities of the ovary becoming 

 twice as many as the styles 

 y. Carpels hard and bony when ripe, 

 distinct or cohering in fruit 



b. Pistil one, fruit a drupe 



Rosa 



Sorbus 

 Sorbaria 



Rubus 



Physocarpus 

 Spiraea 



Malus 



Aronia 



Cydonia 



Amelanchier 



Crataegus 

 Prunus 



Potentilla Linne 1753 Cinquefoil Fivefinger 



( L. p t e n s, powerful, with a diminutive suffix, referring to the medical 



properties) 



Herbs, or rarely shrubs; leaves alternate, compound and stipulate; 

 flowers mostly yellow, cymose or solitary; calyx tube flat or hemispheric. 



