160 ROSACES. (ROSE FAMILY.) 



t- - Leaves palmate, of 3 or 5 leaflets ; tomentose or villous. 



8. P. argentea, L. (SILVERY CINQUE-FOIL.) Stems ascending, panicu- 

 lately branched at the summit, many-flowered, white-woolly ; leaflets 5, wedge- 

 oblong, almost piunatifid, entire toward the base, with revolute margins, green 

 above, white with silvery wool beneath. Dry barren fields, etc., N. Scotia to 

 N. J., west to Dak. and E. Kan. June -Sept. (Eu.) 



9. P. frigida, Vill. Dwarf (1-3' high), tufted, villous when young; 

 leaflets 3, broadly cuneate-obovate, deeply 3 - 5-toothed at summit, nearly gla- 

 brous above ; flowers mostly solitary, small, on very slender stems ; bractlets 

 and sepals equal. Alpine summits of the White Mts. (Eu.) 



* * Style lateral ; purple petals (shorter than the broad calyx) somewhat persist 



ent ; disk thick and hairy ; achenes glabrous ; hairy receptacle becoming 

 large and spongy. 



10. P. palftstris, Scop. (MARSH FIVE-FINGER.) Stems stout, ascend- 

 ing from a decumbent rooting perennial base (-2 long), glabrous below; 

 leaves pinnate; leaflets 5-7, oblong, serrate, lighter colored and more or less 

 pubescent beneath ; flowers few in an open cyme ; calyx (!' broad) dark purple 

 inside. Cool bogs, N. J. to N. Ind., 111., Minn., and northward. (Eu.) 



* # # Style attached below the middle ; achenes and receptacle densely villous ; 



woody perennials. 



11. P. frutic6sa, L. (SHRUBBY CINQUE-FOIL.) Stem erect, shrubby 

 (1-4 high), much branched; leaves pinnate; leaflets 5-7, crowded, oblong- 

 lanceolate, entire, silky, usually whiter beneath and the margins revolute ; 

 petals yellow, orbicular. Wet grounds, Lab. to N. J., west to Minn., northern 

 Iowa, and north and westward. June - Sept. (Eu.) 



12. P. tridentata, Ait. (THREE-TOOTHED C.) Stems low (1-10' high), 

 rather woody at base, tufted, ascending, cymosely several-flowered; leaves 

 palmate ; leaflets 3, wedge-oblong, nearly smooth, thick, coarsely 3-toothed at 

 the apex ; petals white ; achenes and receptacle very hairy. Coast of N. Eng. 

 from Cape Cod northward, Norfolk, Ct. (Barbour), and mountain-tops of the 

 Alleghanies ; also shores of the upper Great Lakes, and N. Iowa, Wise., and 

 Minn. 



3. Styles flliform, lateral; peduncles axillary, solitary, \-flowered; achenes 

 glabrous; receptacle very villous; herbaceous perennials, with yellow flowers. 



13. P. Anserina, L. (SILVER- WEED.) Spreading by slender many- 

 jointed runners, white-tomentose and silky-villous ; leaves all radical, pinnate ; 

 leaflets 7-21, with smaller ones interposed, oblong, sharply serrate, silky to- 

 mentose at least beneath ; bractlets and stipules often incisely cleft ; pedun- 

 cles elongated. Brackish marshes, river-banks, etc., New Eng. to N. J., N. 

 Ind., Minn., and northward. (Eu.) 



14. P. Canad&nsis, L. (COMMON CINQUE-FOIL or FIVE-FINGER.) Stems 

 slender amd decumbent or prostrate, or sometimes erect ; pubescence villous, often 

 scanty ; leaves ternate, but apparently quinate by the parting of the lateral leaf- 

 lets ; leaflets cuneate-oblong or -obovate, incisely serrate, nearly glabrous above ; 

 bractlets entire. Dry soil ; common and variable. Apr. - July. Often pro- 

 ducing summer runners. 



