10. P. palústris, Scop. (MARSH FIVE-FINGER.) Stems stout, ascending from a decumbent rooting perennial base (½--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 (1´ broad) dark purple inside.--Cool bogs, N. J. to N. Ind., Ill., Minn., and northward. (Eu.) [*][*][*] _Style attached below the middle; achenes and receptacle densely villous; woody perennials._ 11. P. fruticòsa, 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. tridentàta, 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, Wisc., and Minn. § 3. _Styles filiform, lateral; peduncles axillary, solitary, 1-flowered; achenes glabrous; receptacle very villous; herbaceous perennials, with yellow flowers._ 13. P. Anserìna, 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 tomentose at least beneath; bractlets and stipules often incisely cleft; peduncles elongated.--Brackish marshes, river-banks, etc., New Eng. to N. J., N. Ind., Minn., and northward. (Eu.) 14. P. Canadénsis, L. (COMMON CINQUE-FOIL or FIVE-FINGER.) _Stems slender and decumbent or prostrate_, or sometimes erect; _pubescence villous, often scanty; leaves ternate, but apparently quinate_ by the parting of the lateral leaflets; _leaflets cuneate-oblong or -obovate_, incisely serrate, nearly glabrous above; bractlets entire.--Dry soil; common and variable. Apr.--July.--Often producing summer runners. 11. SIBBÁLDIA, L. Calyx flattish, 5-cleft, with 5 bractlets. Petals 5, linear-oblong, minute. Stamens 5, inserted alternate with the petals into the margin of the woolly disk which lines the base of the calyx. Achenes 5--10; styles lateral.--Low and depressed mountain perennials; included by some in Potentilla. (Dedicated to _Dr. Robert Sibbald_, professor at Edinburgh at the close of the 17th century.) 1. S. procùmbens, L. Leaflets 3, wedge-shaped, 3-toothed at the apex; petals yellow.--Alpine summits of the White Mts., and northward. (Eu.) 12. ALCHEMÍLLA, Tourn. LADY'S MANTLE.