KOSACEAE. 149 



obovate, 5-8 mm. long: fruits of few drupelets, about 1 cm. in diameter, black, 

 sour. Frequent, in sphagnum swamps. 



6. DRYMOCALLIS Fourr. Herbs with erect stems. Leaf-blades pin- 

 nately several-foliolate, the leaflets toothed. Petals yellow or white, rounded. 

 Stamens in 5 clusters. Carpel-body ovoid: style fusiform, basal. Achenes 

 glabrous. 



1. D. agrimonioides (Pursh) Eydb. Stems 3-10 dm. tall, glandular, villous: 

 leaflets 1-6 cm. long; blades sharply incised-serrate : cymes dense: sepals 

 ovate : petals white : achenes about 3 mm. long. Lower Susquehanna valley. 

 Eare, on dry river banks near Safe Harbor. Schists. Sum. 



7. FRAGrARIA [Tourn.] L. Acaulescent erect and often stoloniferous 

 herbs. Leaf-blades pinnately 3-foliolate. Scapes several-flowered. Bractlets 

 smaller than the sepals, entire. Petals surpassing the bractlets. Spr. 

 STRAWBERRY. 



Achenes borne on the surface of the accrescent receptacle : leaflets sessile or essen- 

 tially so. 



Leaflets thickish : fruit mainly less than 15 mm. long : plants stout : naturalized 



species. 1. F. vesca. 

 Leaflets thin : fruit mainly over 15 mm. long : plants slender : 



native species. 2. F. americana. 



Achenes borne in pits in the accrescent receptacle : leaflets stalked. 3. F. virginiana. 



1. F. vesca L. Eootstocks rather stout: blades of the leaflets thinnish, 

 rhombic-obovate, mostly rounded at the apex, but often aeutish, 2-10 cm. long : 

 scape usually 1-2 dm. tall, villous: pedicels appressed-pubescent : sepals ovate 

 to lanceolate: corolla 1-1.5 cm. wide: fruits subglobose, 1-1.5 cm. in diameter, 

 red or whitish. Not common, on roadsides. Nat. of Eu. EUROPEAN WOOD- 

 STRAWBERRY. 



2. F. americana (Porter) Britton. Eootstock slender: blades of the leaflets 

 thin, rhombic-obovate, mostly acute, 3-8 cm. long: scape 1.5 dm. tall or less, 

 villous: pedicels somewhat appressed-pubescent: flowers similar to those of F. 

 vesca, but smaller : fruits conic-ovoid, 5-7.5 mm. long, red. N. M. Bather 

 rare, on cliffs, hillsides and roadsides. Sandstones and shales, limestones. 

 AMERICAN WOOD-STRAWBERRY. 



3. F. virginiana Duchesne. Eootstocks stout: blades of the leaflets thick, 

 obtuse, 3-10 cm. long: scapes 1.5-5 dm. tall: corollas mostly over 15 mm. wide: 

 fruits hemispheric. Common, in fields and on roadsides. SCARLET-STRAW- 

 BERRY. 



8. DUCHESNEA J. E. Smith. Caulescent creeping herbs. Leaf -blades 

 pinnately 3-foliolate. Peduncles 1-flowered. Bractlets larger than the sepals, 

 toothed. Petals surpassed by the bractlets. 



1. D. indica (Andr.) Focke. Stem or branches elongate: leaflets ovate to 

 obovate: sepals 6-8 mm. long: petals obovate: fruits ovoid or subglobose, 

 8-10 mm. in diameter : achenes red. Not common, in fields and on roadsides. 

 Nat. of As. Spr. and sum. YELLOW-STRAWBERRY. INDIAN-STRAWBERRY. 



9. POTENTILLA L. Herbs or partially woody plants. Leaf-blades 

 pinnately or digitately foliolate. Flowers in corymbose cymes or solitary. 

 Petals white, yellow, red, or purple, notched. Eeceptacle hemispheric or conic. 

 Carpels and achenes ovoid. CINQUEFOIL. FIVE-FINGER. 



Flowers axillary to the leaf-like bracts : stems ultimately creeping or spreading : 



perennials. 



Stems silky-villous : first flowers at the second node of the stem or a succeeding 

 node. 1. P. canadcnsis. 



