ROSAGEAE. 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. agrimonioid.es (Pursh) Rydb. 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. — Scliists. — Sum. 



7. FRAGARIA [Tourn.] L. Aeaulescent erect and often stoloniferous 

 herbs. Leaf-blades piunately 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. T. vesca L. Rootstocks rather stout: blades of the leaflets thinnish, 

 rhombic-obovate, mostly rounded at the apex, but often acutish, 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) Brittou. 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. Rather 

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

 American wood-strawberry. 



3. F. virginiana Duchesne. Rootstocks 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. — Yelloav-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. Receptacle hemispheric or conic. 

 Carpels and achenes ovoid. — Cinquefoil. Five-finger. 



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

 perennials. , , ^ j- 



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

 node. 1- P- canadensis. 



