Rosaceae 151 



Styles terminal. Potentilla. 



Styles lateral. 



. Carpels hairy ; shrubs. Dasyphor a 



Carpels smooth ; herbs. 



Stamens 5; carpels 10-15. Sibbaldia. 



Stamens 20; carpels numerous. 



Leaves trifoliate ; receptacle fleshy. 



Fragaria. 



Leaves pinnate, receptacle not fleshy. 

 Flowers dark purple. Comarum. 



Flowers yellow. 



Plant with stolons; flowers solitary. 



Argentina. 

 Styles persistent, mostly plumose. 



Calyx lobes and petals 8 or 9. Dry as. 



Calyx lobes and petals 5. 



Style jointed, upper part deciduous. 



Geum. 

 Style not jointed, upper part plumose. 



Sieversia. 



Smooth, stems caespitose, very 

 Lutkea 

 e tinata leafy. Leaves trifoliate, per- 



(Pursh.) sistent, leaflets deeply 2-4-lobed, 

 Kuntze. the lateral ones decumbent, 



Cut-leaved forming a broad pe ti o le. Flower- 



Lutkea. 



ing stems 2-6 inches high with 



a dense terminal raceme of many white 

 flowers, about J of an inch broad; calyx 

 lobes ovate, acute; petals 5, obovate, exceed- 



