Rose Family. 47 



tatum Pursh.) 



FRAGAF^IA L. Strawberry. Stemless perennial stoloniferous hairy herbs, 

 with trifoliolate radical leaves, and white scapose polygamo-dioecious flowers. 

 Calyx deeply 5-cleft, with 5 narrow bractlets at the base of the sinuses giving 

 it the appearance of being 10-cleft. Petals 5, obcurdate. Stamens and styles 

 many. Receptacle in fruit becoming globose or conical, pulpy, scarlet, bear- 

 ing the dry acheues on or near the surface. 



F- virginiana Duchesne. Stout, tufted, more or less villous-pubeseent; 

 leaflets obovate-cuneate, coriaceous, serrate; calyx becoming erect-spreading; 

 aehenes imbedded in pits of the oblong receptacle. Fields and woods; May- 

 June; common. 



F- vesca L. Fruiting receptacle conical, without pits; aehenes projecting 

 on the nearly even surface; fruiting calyx spreading or reflexed; leaflets thick- 

 ish. Introduced; May; reported from several counties but is confused with 

 the following species. 



F- americana Porter. Villous-pubeseent or glabrate, runners produced 

 freely; leaflets thin, ovate or oval, the terminal cuneate-ovate, all incised- 

 dentate; fruit ovoid or elongated-conic, reddish or pink, aehenes borne on the 

 even surface. Rocky woods; May-June; infrequent; forms from Winneshiek, 

 Johnson, and Decatur counties referred to this species. 



POTENT1LLA L. Herbs Or shrubs, with alternate stipulate compound 

 leaves, and solitary or cymose flowers. Calyx 5-lobed, 5-bracteolate. Petals 

 S. Stamens many. Aehenes many, collected in a head, on a dry usually pu- 

 bescent or hairy receptacle. 



* Perennials; flowers white; style nearly basal. 



P. arguta Pursh. GUindular Chiinpiefoil. Stem 1-4 feet high, mostly sim- 

 ple, glandular and brownish-hairy; basal leaves petioled. pinnately 7-11-foli- 

 olate, leaflets incised dentate, the lateral ovate, oval or rhomboid, the termin- 

 al one cune&te; stem-leaves short-petiuled or sessile, leaflets fewer; flowers 

 white, cyme dense; stamens 25-30, borne on a thick glanduLar disk. Prairies; 

 June-July; common. 



** Annual or biennial, flowers yellow; style terminal. 

 f Leaves not white tomentose; stamens 5-20. 



P. norVegica L. Annual or biennial. 6-30 inches high, hirsute leaves ter- 

 nate, basal and lower petioled, the upper sessile; leaflets obovate, obtuse, in- 

 cisely-serrate, pubescent; flowers small, in a close leafy cyme; calyx large, 

 lobes ovate; petals obovate, retuse, shorter than the calyx-lobes; stamens 15- 

 20. Dry soil; June-September; common. ( P montspeliensis L.) 



P. paradoxa Nutt. Stems decumbent to erect, subvillous, 1-3 feet high; 

 leaves mostly petioled, pinnately 5-11-foliolate; leaflets obovate or oval, ob- 

 tuse; flowers in a loose leafy cyme; stamens about 20; aehenes glabrous, 

 strongly gibbous. Wet soil, shores; June-September; frequent; Cerro Gordo, 

 Dickinson, and Woodbury counties. (P. suplna L. of Gray's Manual. ) 



P. nicolletii ( Wats.) Sheldon. Similar to the preceding but leaves mostly 

 3-foliolate; flowers falsely racemose; stamens 10-15. Reported from Iowa. 



P. pentandra Engelm. Stem 1-4 feet high, erect, hirsute, branched a- 

 bove; basal and lower leaves petioled, 3-foliolate, the lateral leaflets deeply 

 parted, the upper ternate; leaflets oblanceolate or oblong, obtuse, incised-den- 

 tate; flowers terminal, more or less cymose; stamens 5-8, when 5 opposite the 

 sepals. Reported from Scott, Story, Humbolt, Woodbury, and Fremont 

 counties. 



