' ROSE FAMILY 119 



2. F. vesca L. European Strawberry. Leaflets ovate or broadly 

 oval, dentate above, wedge-shaped below, slightly hairy. Scape usu- 

 ally longer than the petioles. Fruit globular or oval, akenes adherent 

 to the nearly even surface of the receptacle. Common in cultivation. 

 Many of the cultivated varieties of strawberry are hybrids between 

 the two described above. The following variety is by some regarded 

 as distinct.* 



Var. americana Porter. American Wood Strawberry. Slender, 

 smooth or silky-downy. Leaflets very thin, sharply cut-toothed, downy 

 beneath with close-lying silvery hairs, the down of the scapes, the 

 pedicels, and sometimes of the leafstalks also, usually close-lying. 

 Calyx lobes reflexed in fruit. Rocky woods. 



Vni. WALDSTEINIA Willd. 



Stemless perennial herbs. Leaves 3-5-lobed or -divided. 

 Flowers several, rather small, yellow, on a bracted scape. 

 Calyx tube top-shaped; the limb spreading, with sometimes 

 little bracts alternating with the lobes. Petals 5. Stamens 

 many. Style 2-6. Akenes few, on a dry receptacle. 



1. W. fragarioides Tratt. Barren Strawberry. A low herb with 

 much the appearance of a strawberry plant. Leaflets 3, broadly 

 wedge-shaped, crenate-dentate. Scapes many-flowered ; the flowers 

 rather pretty. Wooded hillsides. 



IX. POTENTILLA L. 



Perennial herbs, rarely shrubs. Leaves compound ; stipules 

 united to the petiole. Flowers white or yellow, rarely red ; 

 solitary or in cymes. Calyx hypogynous, 5-cleft, with 5 little 

 bracts alternating with its lobes. Petals 5. Stamens many. 

 Carpels usually many, on a dry convex or concave receptacle ; 

 styles falling off from the akenes as they mature. 



B. Fl. species 5 (Argentina). 



1. P. arguta Pursh. Upright Cinquefoil. An erect, stout, hairy 

 plant, 1-4 ft. high. Basal leaves long'-petioled, pinnate. Stem leaves 

 few, each of 3-7 leaflets, the latter broadly ovate and cut-toothed or 

 serrate, downy underneath. Flowers large, in dense terminal clus- 

 ters ; the petals whitish or cream color. Rocky hills. 



2. P. monspeliensis L. Rough Cinquefoil. Annual or biennial. 

 Stem rough-hairy, erect and stout, 6-30 in. high. Leaves of 3 leaf- 

 lets, the lower petioled, the upper stem leaves sessile or nearly so. 



