12-4 ROSACEA. (ltOSK FAMILY.) 



shorter than the calyx. (Dalibarda lobata, Baldw.) — 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 cymose. 

 * 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 senate ; 

 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-foliolatc; leaflets obovate-oblong, coarsely serrate; 



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



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. 



8. 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 cynic. — High mountains of North Carolina. 

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



12. FRAGARIA, Toum. Strawberry. 



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

 pulpy and scarlet receptacle. Style lateral. — Perennial herbs with ere< ping 

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



1. F. Virginiana, Fhrhart. 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 -l'-6' high. 



13. RXJBUS, L. Brier. Bramble. 



Calyx concave or flatfish, 5-paitcd, without bracts, Petals . r >, deciduous. 

 Stamen, numerous. Achenia juicy, crowded on the conical or Cylindrical re- 



ceptaclo. Style nearly terminal, deciduous — Perennial or shrubby and mostly 

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

 flowers. 



* Heads of achenia hemispherical, deciduous : receptacle dry. 

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

 corymbs hispid v>iih glandular hairs; leaves large, broadly ovate, 8-lobed, or 



