252 XLVII1. ROSACE^E. FRAGARIA 



few large, incised teeth, smooth above, silvery-canescent beneath, sessile ; fls. 

 iit a cymose corymb ; pet. longer than the obtusish sepals. A pretty species, on 

 dry or rocky hills, Can. and N. States, remarkable for the silvery whiteness of 

 the lower surface of the leaves. Stems 6 10' long, at length with slender 

 branches. Leaflets 5 9" by 1 2", with 2 or 3 slender, spreading teeth each 

 side ; upper ones linear, entire. Flowers small. Calyx canescent. Petals yel- 

 low. JR. Sept. 



* * * Leaves pinnate. 



6. P. FRUTICOSA. (P. floribunda. Ph.} Shrubby Cinqucfoil. 



St. fruticose, very branching, hirsute, erect ; Ifts. 5 7, linear-oblong, all 

 sessile, margin entire and revolute; pet. large, much longer than the calyx. A 

 low, bushy shrub, in meadows and rocky hills. Northern States and Brit. Am. 

 Stems 1 2f high, with a reddish bark; petioles shorter than the leaves. Leaf- 

 lets f 1J' (mostly 1') by 2 3" wide, acute, crowded, pubescent. Stipules 

 nearly as long as the petioles. Flowers | !' diam., yellow, in terminal clus- 

 ters. Jn. Aug. 



7. P. ANSERlNA. Silver-weed. Goose-grass. 



St. slender, creeping, prostrate, rooting; Ivs. interruptedly pinnate ; Ifts. 

 many pairs, oblong, deeply serrate, canescent beneath ; ped. solitary, 1-flowered, 

 very long. A fine species on wet shores and meadows, N. Eng. to Arctic Am. 

 Stems subterraneous, sending out reddish stolons 1 2f long. Petioles mostly 

 radical, 6 10' long. Leaflets 1 !' by 3 G", sessile, with several minute 

 pairs interposed. Peduncles as long as the leaves. Fls. yellow, 1' diam. Jn. Sept. 



8. P. ARGUTA. Ph. (P. confertiflora. Hitchcock. Boottia sylvestris. Bw.} 

 False Avens. White-flowered Potentilla. St. erect; radical Ivs. on long 



petioles, 7 9-foliate, cauline few, 3 7-foliate ; Ifts. broadly ovate, cut-serrate ; 

 fls. in dense, terminal cymes. Along streams, &c., Can. and N. States, W. to 

 the Rocky Mts. Stems 2 3f high, stout, terete, striate, and with nearly the 

 whole plant very pubescent. Radical leaves If or more long. Leaflets 1 2' 

 -ong, | as wide, sessile, odd one petiolulate. Fls. about 8" diam. Petals round- 

 ish, yellowish white, longer than the sepals. Disk glandular, 5-lobed. May, Jn. 



9. P. PARADOXA. Nutt. (P. supina. MX.} 



Decumbent at base, pubescent; Ivs. pinnate; Ifts. 7 9, obovate-oblong, 

 incised, the upper ones confluent; slip, ovate; ped. solitary, recurved in fruit; 

 pet. obovate, about equaling the, sepals; ach. 2-lobed, the lower portion chiefly 

 composed of starch-like albumen. River banks, Ohio to Oregon. Nultall in 

 T. & G. PI. p. 437. 



13. COMlRUM. 

 Gr. KOiaofj the strawberry tree, which this plant resembles. 



Calyx flat, deeply 5-cleft, with bracteoles alternating with the seg- 

 ments ; petals 5, very small ; stamens numerous, inserted into the 

 disk; achenia smooth, crowded upon the enlarged, ovate, spongy, per- 

 sistent receptacle. % Lvs. pinnate. 

 C. PALUSTRE. Marsh Cinqiicfoil. 



In spagnous swamps, N. States! Wise. ! to the Arctic Circle. Stems creep- 

 ing ai base, 1 2f high, nearly smooth, branching. Leaflets 3, 5 and 7, crowded, 

 \\ 2' long, \ as wide, oblong-lanceolate, hoary beneath, obtuse, sharply ser- 

 rate, subsessile ; petiole longer than the scarious, woolly, adnate stipules at 

 base. Flowers large. Calyx segments several times larger than the petals. 

 Petals about 3" long, ovate-lanceolate, and, with the stamens, styles and upper 

 surface of the sepals, dark purple. Fruit permanent. Jn. 



14. FRAGARIA. 



Lat. fragrans, fragrant ; on account of its perfumed fruit. 



Calyx concave, deeply 5-cleft, with an equal number of alternate. 

 exterior segments or bracteoles ; petals 5, obcordate ; stamens 00 ; 

 achenia smooth, affixed to a large, pulpy, deciduous receptacle. 1\ 

 Stems stoloniferous. Lvs. irifoliate. Ffc. on a scape, white. 



