252 XLVIII. ROSACEiE. Fragaria. 



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

 in a cymose corymb ; fet. 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- 

 loAV. Jn. — Sept. 



* * * Leaves piiinale. 



6. P. FRUTIC6SA. (P. floribunda. Ph.) Shrubby Cinquefoil. 



St. fruticose, very branching, hirsute, erect ; Jfts. b—1, linear-oblong, all 

 sessile, margin entire and revolute ; peL 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 i— U' (mostly 1') by 2—3" wide, acute, crowded, pubescent. Stipules 

 nearly as long as the petioles. Flowers f— U' diam., yellow, in terminal clus- 

 ters. Jn. — Aug. 



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



5"^. 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, &— 10' long. Leaflets 1— 1|' by 3—6", 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 sylvcstris. Bw.) 

 False Avens. White-Jlou-ered Poientilla. — St. erect; radical Ivs. on long 



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

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

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

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

 ong, f 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. 11—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. Nuttall in 

 T. & G. Fl. p. 437. 



13. COM Arum. 



Gr. KOfiapos, the strawbeny 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 Cinquefoil. 



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

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

 11—2^' long, A 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, fiagrant ; 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. — ^^l- 

 Stems sioloniferous. Lvs. trifoliate. Fis. on a scape, white. 



