124 ROSACE^E. (ROSE FAMILY.) 



shorter than the calyx. (Dalibarda lobata, Ba/dw.) Banks of the Flint and 

 Chattahoochee rivers, in the middle districts of Georgia, not common. May 

 and June. Scape and leaves 4' -8' high. 



11. POTENTILLA, L. CINQUEFOIL. 



Calyx flat, 5-cleft, with as many bracts. Petals 5, obcordatc or roundish. 

 Stamens numerous. Style lateral or terminal, deciduous. Achenia collected 

 in a head on the dry and pubescent receptacle. Herbs or shrubby plants, with 

 variously divided leaves. Flowers solitary or cyniose. 

 * Style terminal, or nearly so. 



1- P- Norvegica, L. Annual, hairy; stem erect, branched; leaves pal- 

 mately 3-foliolate, the leaflets obovate-oblong or lanceolate, coarsely serrate ; 

 flowers pale yellow, in leafy cymes ; petals shorter than the calyx. Waste 

 places. Introduced, and sparingly naturalized. Stem 1 - 2 high. 



2. P. Canadensis, L. Perennial, hairy ; stem prostrate or ascending, 

 simple ; leaves palmately 5-folioIate ; leaflets obovate-oblong, coarsely serrate ; 

 flowers axillary, solitary, on long filiform peduncles ; petals yellow, obcordatc, 

 as long as the calyx. (P. simplex, Michx.) Meadows in the upper districts, 

 Mississippi to North Carolina, and northward. July and August. Stem 

 l-3 long. 



* * Style lateral. 



3. P. tridentata, Ait. Stem somewhat shrubby at the base, erect or as- 

 cending, pubescent ; leaves rigid, trifoliolate, cuncate-oblong, 3-toothed at the 

 apex ; flowers white, in a terminal cyme. High mountains of North Carolina. 

 July. Stem 5' - 10' high. Achenia and receptacle very hairy. 



12. FRAGARIA, Tourn. STRAWBERRY. 



Flowers like Potentilla, but the dry achenia borne on the enlarged, at length 

 pulpy and scarlet receptacle. Style lateral. Perennial herbs with creeping 

 runners. Leaves radical, trifoliolate. Flowers white, in terminal cymes. 



1. F. Virginiana, Ehrhart. Hairy ; leaflets oblong, coarsely serrate : 

 scape few-flowered ; fruit roundish, the achenia imbedded in the deeply pitted 

 receptacle. Rich woods, Florida to Mississippi, and northward. March and 

 April. Scapes 4' - 6' high. 



13. RITBUS, L. BRIER. BRAMBLE. 



Calyx concave or flattish, 5-parted, without bracts. Petals 5, deciduous. 

 Stamens numerous. Achenia juicy, crowded on the conical or cylindrical re- 

 ceptacle. Style nearly terminal, deciduous Perennial or shrubby and mostly 

 prickly plants, with lobed or compound petioled leaves, and white or reddish 

 flowers. 



* Heads of achenia hemispherical, deciduous : receptacle dry. 



1. R. odoratus, L. Shrubby, not prickly; the branches, petioles, and 

 corymbs hispid with glandular hairs ; leaves large, broadly ovate, 3-lobed, or 



