4. P. supìna, L. _Stems decumbent at base_ or erect, often stout, leafy, _subvillous; leaflets pinnately 5--11_, obovate or oblong; _cyme loose, leafy_; stamens 20; _achenes strongly gibbous on the ventral side_. (P. paradoxa, _Nutt._)--Minn. to Mo., and westward; also eastward along the Great Lakes.--Var. NICOLLÉTII, Watson. Slender; leaflets mostly but 3; inflorescence much elongated, leafy, and falsely racemose.--Devil's Lake, Minn. [+][+] _Herbaceous perennials, more or less white-tomentose; leaflets incisely pinnatifid; bractlets and sepals nearly equal; stamens 20--25._ 5. P. Pennsylvánica, L. Stems erect or decumbent at base (½--2° high); leaflets 5--9, white-tomentose beneath, short-pubescent and greener above, oblong, obtuse, the linear segments slightly or not at all revolute; cyme fastigiate but rather open.--Coast of Maine, N. H., and the lower St. Lawrence, L. Superior, and westward. July, Aug.--Var. STRIGÒSA, Lehm. Stems 6--12´ high; silky-tomentose throughout; leaflets deeply pinnatifid, the margins of the narrow lobes revolute; cyme short and close.--Minn. and westward. § 2. _Styles filiform, not glandular at base; inflorescence cymose._ [*] _Style terminal; achenes glabrous; stamens 20; herbaceous perennials, with rather large yellow flowers._ [+] _Leaves pinnate._ 6. P. Hippiàna, Lehm. Densely white-tomentose and silky throughout, the upper surface of the leaves a little darker; stems ascending (1--1½° high), slender, branching above into a diffuse cyme; leaflets 5--11, cuneate-oblong, _incisely toothed at least toward the apex, diminishing uniformly down the petiole_; carpels 10--30.--N. W. Minn., and westward. 7. P. effùsa, Dougl. Tomentose throughout, with scattered villous hairs; stems ascending (4--12´ high), diffusely branched above; leaflets 5--11, _interruptedly pinnate, the alternate ones smaller_, cuneate-oblong, _coarsely-incised-serrate or dentate_; carpels 10.--W. Minn. to Mont. and Col. [+][+] _Leaves palmate, of 3 or 5 leaflets; tomentose or villous._ 8. P. argéntea, L. (SILVERY CINQUE-FOIL.) Stems ascending, paniculately branched at the summit, many-flowered, white-woolly; leaflets 5, wedge-oblong, almost pinnatifid, 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. frígida, Vill. Dwarf (1--3' high), tufted, villous when young; leaflets 3, broadly cuneate-obovate, deeply 3--5-toothed at summit, nearly glabrous 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 persistent; disk thick and hairy; achenes glabrous; hairy receptacle becoming large and spongy._