POTENTILLA. ROSACEiE. 443 



three upper leaflets confluent, and so Mr. Nuttall has described it in hi3 

 manuscript notes. But its resemblance to P. flabcllifolia renders it proper 

 to characterize it as above. It is not more than lialf the size of that species; 

 the leaflets and flowers also much smaller, the pedicels short, the minute 

 pubescence wholly glandular, &c. 



24. P. concinna (Richards.) : stems short, few-flowered ; radical leaves 

 palmately 5-7-foliolate ; leaflets cuneate-obovate, serrate at the apex, dense- 

 ly tomentose and white beneatli ; petals obcordate, exceeding the calyx. 

 Lehm. — Richards. ! appx. Frankl. journ. cd. 2. p. 20 ; Lehm. ! in Hook, 

 fl. Bor.-Am. I. p. 193, /. G7. 



Plains of the S;uskatchavvan about Carlton House, Richardson ! Drum- 

 mond ! — Stems numerous from the same roof, 2-3 inches high, difluse, 

 silvery-tomentosc or silky. CauUnc leaves 1-2. Leaflets 3-5 lines long, 

 pale green and somewhat silky above ; the lateral ones often entire. Pe- 

 duncles 2-3, slender. Ovaries smooth. Recei)tacle hirsute. — Ai)i)arently 

 very near P. humifusa. Null., and perhaps only a state of that plant. 



t + Flowering stems prostrate or sarmentoso : pedicels solitary, axillary (or 

 radical), elongated, 1-flowcred. 



25. P. humifusa (Nutt.) : somewhat caespitose ; leaves all radical, pal- 

 mately 5-foliolate ; leaflets cuneate-oblong, obtuse, incisely toothed, white 

 and tomentose beneath, green and pubescent above ; flowering stems short 

 and filiform, procumbent, flagellate, but not creeping, leafless, few-flowered. 

 Nutt. gen. 1. p. 310. 



On high gravelly hills near Fort Mandan, Missouri, Nuttall. — Flowering 

 stems 4-5 inches long. — We have seen no specimens of this apparently very 

 distinct species. 



26. P. Canadensis (Linn.) : hirsute-pubescent ; stems sannentose, procum- 

 bent and ascending ; leaves palmately 5-foUolate ; leaflets obovate-cunei- 

 form, silky beneath when young, incisely serrate-toothed towards the apex ; 

 stipules entire or 2-3-cleft ; pedicels axillary, solitary, elongated ; calyx- 

 segments ovate-lanceolate, shorter than the lanceolate bracleolar segments, 

 and rather shorter than the broadl^^ obovate or obcordate petals ; achenia 

 somewhat rugose. — Linn. ! spec. 1. p>- 498 ; Michx. ! jl. 1. p. 303 ; Nesll. 

 Pot. t. 10, /.'l ; Lehm. ! Pot. p. 118; Torr. ! fi.l.p. 426 ; Ell. sTc. 1. p. 

 573 ; DC. prodr. 2. p. bib ; Darling t. Jl. Cest. p. 303. P. sarmentosa, 

 Willd.! enum. 1. p. 554 ; Bigel.! fl. Bost. ed. 2. p. 204. 



0. pumila : very small. — P. pumila, Poir. diet. 5. p. 594 ; Pursh, fl. 1. 

 p. 354. 



y. simplex : less hirsute ; stems erect or ascending at the base, often sar- 

 mentose towards the apex ; leaflets cuneiform-oblong, at length nearly gla- 

 brous above. — P. simplex, iVf?c/i.r. .' /. c. ; Nestl. I. c. t. 9,/. 2; Lehm.! 

 I. c. ; Ell. I. c. ; DC. ! prodr. 2. p. bib ; Darlingt. I. c. P. Caroliniana, 

 Poir. I. c. 



Dry fields and border of woods, Canada ! to Georgia, and west to Arkan- 

 sas ! April-Aug. — P. pumila is a starved state of P. Canadensis, growing 

 in very sterile soU. P. simplex is a more luxuriant summer state of the 

 same species, growing in richer soil or shady places ; when the stems often 

 attain the length of 2 feet or more, and the leaves become larger, more 

 membranaceous, and less pubescent ; but the radical ones reseinble tliose of 

 the ordinary P. Canadensis. We have an imperfect specimen from Arkan- 

 sas, which presents the leaves of the var. simplex, except that the upjier 

 one is trifoliolate, and the plant is very hirsute. — Cinque-foil. Five-Finger 

 Barren Strawberry. 



