ROSACEA. 99 



3. P. Canadensis Linn. : silky-villous ; stem procumbent and ascend- 

 ing, somewhat branched ; leaves quinate-palmate ; leafets obovate-wedge- 

 form, acutely dentate ; stipules lanceolate, somewhat obtuse ; peduncles 

 solitary, elongated ; lobes of the calyx linear-lanceolate, acute, nearly 

 equalling the obovate or obcordate petals. P. simplex Mich. P. sarvien- 

 tosa Willd. 



Fields and woods. Can. to Geor. W. to Miss. April — Aug. %. — Stems at 

 first short, but at length 12 — 18 inches long. Leaves white, villous when young. 

 Flowers yellow, on slender axillary peduncles. Qtiite variable. Five-finger. 



4. P. minima Haller : stem ascending, pubescent, mostly 1-flowered ; 

 leaves ternate ; leafets obovate, very obtuse, smooth except on the margin 

 and veins beneath, incisely serrate towards the apex ; petals obcordate, 

 longer than the calyx. 



Near the summit of the White Mountains, N. H. June, July. 1\-. — Root 

 fusiform Stems 1 — 3 inches high. Leaves crowded. Flowers small. 



SmaU Cinque/oil. 



5. P. argenieo. Linn. : stem ascending or erect, tomentose ; leaves qui- 

 nate-palmate ; leafets obovate-wedgeform, deeply incised, revolute on the 

 margin, smooth above, canescent beneath ; flowers numerous, corymbed ; 

 lobes of the calyx lanceolate, shorter than the obovate petals. 



Fields. Can. and throughout the U. S. June — Sept. %. — Stems numerous, 

 4 — 10 inches long, somewhat woody at base. Leaves green above. Flowers 

 yellow, small, in spreading corymbs. Silvery CiTiquefoil. 



** Leaves pinnate. 

 G. P. fruticosa Linn. : stem fruticose ; leaves pinnate, hirsute or silky; 

 leafets oblong-lanceolate, very entire, approximate ; stipules lanceolate, 

 membranaceous, acute ; flowers in corymbs, large ; petals longer than the 

 calyx. P. fruticosa and P. fioribunda Pursh. 



Margins of swamps. N. S. N. to Arct. Amer. W. to the Rocky Mountains. 

 June — Sept. — A s^lirub about 2 feet high, much branched and hairy. Leaves 

 numerous, on short petioles. Flowers numerous, large, yellow. 



Shrubby Cinquefoil. 



7. P. snpina Linn. : stem decumbent, herbaceous, dichotomous ; leaves 

 pinnate ; leafets obovate or oblong, somewhat glabrous, more or less toothed ; 

 peduncles axillary, solitary, 1-flowered ; segments of the calyx triangular- 

 lanceolate ; petals as long as the calyx. P. paradoxa Niitt. in Torr. cf* Gr. 



Overflowed banks of streams. Can. and Penn. From the Ohio to Oregon. 

 Nutt. June — Aug. (T). — Flowers small, yellow. Perhaps not a native of om: 

 section. Decumbent Cinquefoil. 



8. P. Anserina Linn. : stem fihform, rooting ; leaves interruptedly pin- 

 nate; leafets ovate-oblong, incisely and acutely serrate, smooth above, silvery 

 canescent beneath ; stipules many-cleft ; peduncles scape-like, as long as 

 the leaves, axillary, solitary ; lobes of the calyx lanceolate, entire, half as 

 long as the obovate petals. 



Wet meadows. N. S. N. to Arct. Amer. W. to Oregon. June. %..— Stems 

 long, reddish, with a tuft of leaves and one or more pedicels at each joint. 

 Leaves sometimes white and silky on both sides. Flowers bright yellow. 



Silver-weed. Wild Tansey. 



9. P. Pennsylvanica Linn. : whole .plant white tomentose ; stem herba- 

 -eous, erect ; leaves interruptedly pinnate ; leafets oblong, obtuse, pinnatifid 



