342 Ordeb 47.— ROSACEA. 



Escaped from cultivation, now common everywhere from Charleston. S. C. to 

 Tallahassee, etc. The large crimson, oval fruit is quite ornamental but insipid. 

 Ripe in May and Jn. § India. (Duchesnia Indica Smith. Potentilla Durandii 

 T. & G.) 



23. CO'MARUM, L. (Gr. n6i.ia.pog, the strawberry tree, which this 

 plant resembles.) Calyx flat, deeply 5-cleft, with bractlets alternating 

 with the segments ; petals 5, much smaller than the sepals ; stamens 

 numerous, inserted into the disk ; achenia smooth, crowded upon the 

 enlarged, ovate, spongy, persistent receptacle. — H Lvs. pinnate. Fls. 

 purple. 



C. palustre L. In sphagnous swamps, N. States, "Wise, to the Arc. Circ. Sts. 

 creeping at base, 1 to 2f high, nearly smooth, branching. Lfts. 3, 5 and 7, 

 crowded, li to 2V long, £ as wide, oblong-lanceolate, hoary beneath, obtuse, 

 sharply serrate, subscssilo ; petiole longer than the scarious, woolly, adnate sti- 

 pules at base. Fls. large. Cal. segm. several times larger than the petals. Pet- 

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

 face of the sepals, dark purple. Fr. permanent. Jn. 



24. POTENTIL/LA, L. Cinquefoil. (Lat. potcntia, power ; in allu- 

 sion to its supposed potency in medicine.) Calyx concave, deeply 4 to 

 5-cleft ; with an equal number of alternate, exterior segments or bract- 

 lets ; petals 4 to 5, roundish ; stamens oo ; filaments slender ; ovaries 

 collected into a head on a small, dry receptacle ; styles terminal and 

 lateral, deciduous ; achenia go. — Herbaceous or shrubby. Lvs. pin- 

 nately or palmately compound. Fls. solitary or cymous, mostly yellow. 



* Leaves palmately 3-foliate Nos. 1—3 



* Leaves palmately 5-foliate Nos. 4 — 6 



* Leaves pinnate. — Shrubs with axillary pedicels No. 7 



— Herbs with axillary pedicels Nos. 8, 9 



— Herbs with terminal cymes Nos. 10, 11 



1 P. Norvegica L. Hirsute; st. erect, dichotomous above; lfts. 3, elliptical ot 

 obovate, dentate-serrate, petiolulate ; cymes leafy; cal. exceeding the emarginate 

 petals. — Old fields and thickets, Arc. Am. to Car. Sts. 1 to 4f high, covered with 

 silky hairs, terete, at length forked near the top. * Cauline petioles shorter than 

 the lvs., lfts. J to 1\' by \ to ^' (lower and radical ones very small), often iucised. 

 Stip. large, ovate, subentire. Fls. many, crowded, with pale yellow petals, shorter 

 than the lanceolate, acute hairy sepals. Jl. — Sept. 



{3. hirsuta T. & G. Hairs loose, silky; st. slender, erect, subsimple, lower 

 and middle lvs. equal, long-petiolate, lfts. roundish-obovate, sessile, incisely 

 dentate ; fls. few ; petals rather conspicuous, nearly as long as the calyx. — 

 Lry fields. (P. hirsuta Mi.) 



2 P. tridentata Ait. Smooth; st. ascending, woolly and creeping at base; 

 lfts. 3, obovate-cuneate, evergreen, entire, with 3 large teeth at the apex ; eymea 

 nearly naked; petals white, obovate. — On the White Mts. and other Alpine sum- 

 mits in tho N. States. Flowering sts. G to 12' high, round, often with minute, 

 appressed hairs. Petioles mostly longer than the leaves. Lfts. sessile, 9 to 18" 

 by 4 to 6", coriaceous, smooth. Petals twice longer than the cal. Carp, and 

 ach. with scattered hairs. Jn., Jl. 



3 P. minima Haller. St. pubescent, ascending, mostly 1 -flowered; lvs. trifoli- 

 ate, lfts. obovate, obtuse, incisely serrate, with 5 to 9 teeth above ; petals yelloto, 

 longer than the sep. — Alpine regions of the White Mts. Sts. numerous and 

 leafy, 1 to 3' high. Lfts. with the margins and veins beneath hairy. Fls. small 

 Petals obcordato. Bractlets oval-obtuse, narrow at the base. Jn. — Jl. 



4 P. Canadensis L. Villous-pubescent ; st. sarmentous, procumbent and as- 

 cending; lfts. 5, obovate, silky beneath, cut-dentate towards the apex, entire 

 and attenuate below ; stip. hairy, often cleft ; ped. axillary, solitary ; bractlets 

 longer than the sepals, and nearly as long as the petals. — Common in fields and 

 thickets, U. S. and Can. Sts. more or less procumbent at base, from a few incUea 



