ROSACEAE (ROSE FAMILY) 483 



/iiVsM^e. .- Roadsides and waste places, local, Mass. to N.J. and Mich. (Adv. 

 from Eu.) 



H-f ++ Flowers in rather compact scarcely leafy cymes {stems only \-2-flowered 



in ii. 11). 



= Leaves b--9-fuliolate ; flowers numerous. 



9. P. Nuttdllii Lehm. Stems several, ascending from a stoutish ba3e, 2-7 

 dm. high, somewhat villous or glahrate ; leaflets oblanceolate or spatulate, the 

 narrow divergent teeth extending halfway to the midrib, green above, glabrous 

 or glahrate and scarcely paler beneath ; cyme with few uj^right brandies. — 

 Meadows and banks of streams, Minn., Man., and westw. June-Aug. 



10. P. KECTA L. Stems upright, very leafy, 3-7 dm. high, loosely hirsute ; 

 leaflets oblanceolate, with narrowly deltoid divergent teeth, more or less hirsute 

 on both surfaces, paler beneath ; calyx hirsute ; the showy yellow corolla 2 cm. 

 broad. (P. sulphurea Lam.) — Fields and roadsides, Me. to Ont., 111., and 

 D. C. June-Aug. (Nat. from Eu.) 



= = Leaves 3-foliolate ; flowers 1 or 2. 



11. P. Robbinsiana Oakes. Dwarf, tufted, villous when young; leaflets 

 broadly cuneate-obovate, deeply 3-5-toothed at summit, nearly glabrous above ; 

 flowers mostly solitary, small, on very slender stems ; bractlets and sepals sub- 

 equal {P.frigida Man. ed. 6, not Vill.) — Alpine summits of the White Mts., 

 N. H. June, early July. 



•I- •«- Leaves pinnate. 



12. P. Hippiana Lehm. Densely white-tomentose and silvery-silky throughout^ 

 the upper surfaces of the leaves a little darker ; stems ascending, 1.&-6 dm. 

 high, slender, branching above into a diffuse cyme ; leaflets 5-11, cuneate- 

 oblong, incisely toothed at least toward the apex, diminishing uniformly down 

 the rhachis ; carpels 10-30. — Prairies and banks of streams, w. Minn, to Sask. 

 and N. Mex. June-Aug. 



13. P. effusa Dougl. Tomentose throughout and with scattered villous 

 pubescence ; stems ascending, 1-3 dm. high, dilfusely branched above ; leaves 

 interruptedly pinnate, the leaflets 5-11, the alternate ones smaller, cuneate- 

 oblong, coarsely incised-serrate or dentate ; carpels 10. — Dry plains, w. Minn, 

 to Assina. and N. Mex. 



* * Style lateral ; purple petals {shorter than the broad calyx) somewhat per- 

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

 large and spongy. 



14. P. palustris (L.) Scop. (Marsh F.) Stems stout, ascending from a 

 decumbent rooting perennial base, 1-6 dm. 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 2-2.5 cm. broad, dark purple inside. 

 {Comarum L.) — Cool bogs. Lab. to Alaska, s. to N. J., Pa., Great L. region, n. 

 la., Wyo., and Cal. June-Aug. (Eurasia.) 



*** Style attached beloio the middle; achenes and receptacle densely villous; 



woody perennials. 



15. P. fruticbsa L. (Shrubby C.) Stem erect, shrubby, 1-8 dm. high, 

 much branched ; leaves pinnate ; Z^a/??<s 5-7, crowded, oblong-lanceolate, ^n^/re, 

 silky, usually whiter beneath and the margins revolute ; petals yelloic, orbicular. 

 {Dasiphoin Rydb.) — Wet or dry open ground, Lab. to Alaska, s. to N. J., Pa., 

 Great L. region, n. la., Ariz., and Cal. June-Sept. (P^urasia.) 



16. P. tridentata Ait. (Threk-toothkd C.) Stems low (3-22 cm. high), 

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

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

 the end; petals whi^e ; achenes and receptacle very hairy. {Sibbaldiopsis 

 Rydb.) — Lab. to e. N. E., where common in exposed rocky or gravelly situa- 

 tions, N. J., and southw. on the upper Alleghenies ; also westw. chiefly along 

 the Great Lakes. June-Aug. 



J&Mi 



