ROSACEA. (UOSK FAMILY.) 155 



undcmcatli ; flowers cymoso-clustorcd ; pftnla yellowish or irliitish : divk tliick and 

 glaiulular. — Koik)- hills : coininoii northward and westward. July. 



* » Arhfiiia (lit hfist Mow) and the convex receptacle lu'lloiix. 



8. P, Anserlna, L. (8ii,veu-Wj;kd.) Ilcrhm-eows, neepini) trith slender 

 rimixrs : lians all rmlirnl , pinnate ; /ef{/?(7s 9 - 19, with niimitc jjairs interposed, 

 oblon;:, i)innatilid-scrratc, mostly preen and nearly smooth above, silren/. white 

 xrith silLij down underneath; stipules many-eleft ; flow-rs solitary {i/elloir), on lonp 

 scape-like peduncles. — Brackish marshes, river-banks, &c., New I^ipland to 

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



9. P. frutie6sa,'L. (Siiuiunv Cinque-foil.) Stem erect, .s/(n/% (2° - 

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

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

 numerous (i/ellow), terminating the branchlets. — Wet grounds: common north- 

 wards. Junc-Sept. (Ku.) 



10. P. trident^ta, Ait. (Thkee-toothed C.) Stems low (4'-6' high), 

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

 palmate ; hnflcts 3, wedge-oblong, nearly smooth, thick, cwrsely ^-toothed at the 

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

 from Cape Cod, and moimtain-tops from the Allcghanies, northward: also 

 shores of the upper Great Lakes. June. 



§ 3. Sti/les moderately lateral ; petals {shorter than the calyx, ovate-lancfolate) and 

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

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



11. P. pallistris, Scop. (Marsh Five-Fixger.) Stems ascending 

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

 or oi)long crowded serrate leaflets, whitish beneath; flowers somewhat cymose; 

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

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



12. FRAGARIA, Toum. Str.vwberry. 



Flowers nearly as in I'otcntilla. Styles deeply lateral. Keceptaclc in fruit 

 much enlarged and conical, becoming pul])y 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, obovatcwcdge-forni, 

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

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

 iu s])ring. (The sjieeies are indiscriminately called Wild SxRAwnERRV.) 



1. F. Virginiana, Ehrhart. Achema imlmlded in the deeply pitlid finitiwj 

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

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

 of a firm or eoriaci^nus texture. (F. Canadensis, Michx.) — Moist or rich wood- 

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

 pecially of the prdici'ls, are silky and appressid. It is the original of the Vir- 

 ginian Scarlet strawberries. 



Var. IlIino6nsi8 (F. Grayana, Vilmorin, F. Illinoensis & F. lowcnsis, 



