ROSACES. 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. sarmen- 

 tosa W'dld. 



Fields and woods. Can. to Geor. W. to Miss. April Aug. 1\.. Stems at 

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

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



4. P. minima Holler : 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. 



Small Cinquefoil, 



5. P. argentea, 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. 7J.. Stems numerous, 

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

 yellow, small, in spreading corymbs. Silvery Cinquefoil. 



** Leaves pinnate. 



6. 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. floribunda Pursh. 



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

 June Sept. A shrub about 2 feet high, much branched and hairy. Leaves 

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



Shrubby Cmquefo'd. 



1. P. supina 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 Nutt. in Torr. fy Gr. 



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

 Null,. June Aug. (J). Flowers small, yellow. Perhaps not a native of our 

 section. Decumbent Cinquefoil. 



8. P. Anserina Linn. : stem filiform, 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. Pennsylvania Linn. : whole plant white tomentose ; stem herba- 

 :eou8, erect ; leaves interruptedly pinnate ; leafets oblong, obtuse, pii 



