DICOTYLEDONOUS PLANTS 113 



longer than the sepals. Fruit ovoid, black, smaller than the pre- 

 ceding. Common in old fields.* 



8. R. hispidus, L. Stem trailing or prostrate, often several feet 

 in length, armed with small, straight, or recurved prickles, and 

 often thickly set with bristles. Leaves petioled, mostly of 3 leaflets ; 

 leaflets obovate, obtuse, rather coarsely serrate. Flowering branches 

 commonly erect, few-flowered, flowers white. Fruit black. Common 

 on dry, sandy soil.* 



VIII. 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 w^ith 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. FRAGARIA, Tourn. 



Perennial scape-bearing herbs, with runners. Leaves with 

 3 leaflets ; stipules adnate to the petiole. Flowers (of Ameri- 

 can species) white. Calyx free from the ovary, 5-parted, 

 5-bracted, persistent. Petals 5. Stamens many. Carpels 

 many, on a convex receptacle. Akenes of the ripe straw- 

 berry many, very small, more or less imbedded in the large, 

 sweet, pulpy receptacle. 



1. F. virginiana, Mill. Wild Strawberry. Leaflets thick, 

 oval to obovate, coarsely serrate, somewhat hairy. Scaj)e usually 

 shorter than the petioles, few-flowered. Fruit ovoid, akenes imbedded 

 in deep pits. Common.* 



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

 broadly oval, dentate above, wedge-shaped below, slightly hairy. 

 Scape usually longer than the petioles. Fruit globular or oval, 

 akenes adherent to the nearly even surface of the receptacle. Com- 

 mon in cultivation. Many of the cultivated varieties of strawberry 

 are hybrids between the two described above. The American form 

 js les§ hairy than the European and is by some regarded as distinct.* 



