ROSACEA. (ROSE FAMILY.; 155 



underneath; flowers cymose-clustered ; petals yellowish or whitish ; disk thick and 

 glandular. — Rocky hills : common northward and westward. July. 



* * Achenia (at least below) and the convex receptacle villous. 



8. P. Anserina, L. (Silver- Weld.) Herbaceous, creeping with slender 

 runners; leaves all radical, pinnate ; leaflets 9- 19, with minute pairs interposed, 

 oblong, pinnatifid-serrate, mostly green and nearly smooth above, silvery-white 

 with silky down underneath; stipules many-cleft; flow.rs solitary (yellow), on long 

 scape-like peduncles. — Brackish marshes, river-banks, &c, New England to 

 Penn., Wisconsin, and northward. June -Sept. (Eu.) 



9. P. fruticosa, L. (Shrubby Cinque-foil.) Stem erect, shrubby (2° - 

 4° high), very much branched; leaves pinnate; leaflets 5-7, closely crowded, 

 oblong-lanceolate, entire, silky, especially beneath; stipules scale-like ; flowers 

 numerous (yellow), terminating the branchlets. — Wet grounds: common north- 

 wards. June -Sept. (Eu.) 



10. P. tridentata, Ait. (Three-toothed 0.) Stems low (4' -6' high), 

 rather woody at the base, tufted, ascending, cymosely several-flowered; leaves 

 palmate ; leaflets 3, wedge-oblong, nearly smooth, thick, coarsely 3-toothed at the 

 apex; petals white; achenia and receptacle very hairy. — Coast of New England, 

 from Cape Cod, and mountain-tops from the Alleghanies, northward : also 

 shores of the upper Great Lakes. June. 



§3. Styles moderately lateral: petals (shorter than the calyx, ovate-lanceolate) amd 

 filaments more or less persistent : disk thick and hairy : achenia glabrous : recep- 

 tacle hairy, convex, at length large and spongy. (Comarum, L.) 



11. P. paltistris, Scop. (Marsh Five-Finger.) Stems ascending 

 from a creeping perennial base (1° -2° high) ; leaves pinnate, of 5 - 7 lanceolate 

 or oblong crowded serrate leaflets, whitish beneath; flowers somewhat cymose; 

 calyx (1' broad) dark purple inside ; petals purple. (Comarum palustre, L.) — 

 Cool bogs, New England to Penn., Illinois, and northward. June - Aug. (Eu.) 



12. PRAGARIA, Tourn. Strawberry. 



Flowers nearly as in Potentilla. Styles deeply lateral. Receptacle in fruit 

 much enlarged and conical, becoming pulpy and scarlet, bearing the minute dry 

 achenia scattered over its surface. — Stemless perennials, with runners, and with 

 white cymose flowers on scapes. Leaves radical : leaflets 3, obovate wedge-form, 

 coarsely serrate. Stipules cohering with the base of the petioles, which with the 

 scapes are usually hairy. (Name from the fragrance of the fruit.) — Flowering 

 in spring. (The species are indiscriminately called Wild Strawberry.) 



1. F. Virgilliana, Ehrhart. Achenia imbedded in the deeply pitted fruiting 

 receptacle, which usually has a narrow neck ; calyx becoming erect after flower- 

 ing and connivent over the hairy receptacle when sterile or unfructifled ; leaflets 

 of a flrm or coriaceous texture. (F. Canadensis, Michx.) — Moist or rich wood- 

 lands, fields, &c. — In the true F. Virginiana, the hairs of the scapes, and es- 

 pecially of the pedicels, are silky and appressed. It is the original of the Vir- 

 ginian Scarlet strawberries. 



Var. Illino^nsis (F. Grayana, Vdmorin, F. Illinoensis & F. Iowensis, 



