Vor. II.] ROSE FAMILY. 209 
1. Potentilla arguta Pursh. Tall, or Glandular Cinquefoil. (Fig. 1913.) 
Potentilla arguia Pursh, Fl. Am. Sept. 736. 1814. 
Geum agrimonioides Pursh, loc. cit. 351. Not 
P. agrimonioides Bieb. 1808. 
Erect, stout, simple or little-branched 
above, glandular and villous-pubescent, 1°-4° 
high. Stipules membranous; basal leaves 
-slender-petioled, pinnately 7-11-foliolate; 
leaflets ovate, oval or rhomboid, obtuse at 
‘the apex, the terminal one cuneate, the others 
rounded at the base and commonly oblique, 
all sharply incised-dentate; stem leaves 
short-petioled or sessile, with fewer leaflets; 
flowers white, densely cymose, terminal, nu- 
merous, short-pedicelled, 5’/—7’’ broad; calyx- 
lobes ovate, acute, shorter than the obovate 
petals; stamens 25-30, borne on the glandu- 
lar disk; style nearly basal and fusiform, 
thickened; achenes glabrous. 
On dry or rocky hills, New Brunswick to the 
Rocky Mountains, south to New Jersey, Illinois, 
cand Kansas. June-July. 
2. Potentilla argéntea L. Silvery or Hoary 
Cinquefoil. (Fig. 1914.) 
Potentilla argentea I,. Sp. Pl. 497. 1753. 
Stems ascending, tufted, branched, slightly woody at 
the base, 4’-12’ long, white woolly-pubescent. Stipules 
lanceolate, acuminate; leaves all but the uppermost 
petioled, digitately 5-foliolate; leaflets oblanceolate or 
obovate, obtuse at the apex, cuneate at the base, green 
and glabrous above, white-pubescent beneath, laciniate 
or incised and with revolute margins, 6//-12/’ long; 
flowers cymose, terminal, pedicelled, yellow, 2/’-4/’ 
broad; calyx-lobes ovate, acutish, a little shorter than 
the obovate retuse petals; stamens about 20; style 
filiform, terminal; achenes glabrous. 
In dry soil, Nova Scotia and Ontario to Dakota, south to 
Washington, D. C., Indiana and Kansas. Also in Europe 
and Asia. May-Sept. 
Potentilla collina Wibel, of Europe, collected at Winona, 
Minn., and Cambridge, Mass., differs in its more prostrate 
habit, broader and not revolute leaflets, and larger calyx. 
3- Potentilla rubers (Crantz) Vill. Northern 
Cinquefoil. (Fig. 1915.) 
Fragaria rubens Crantz, Stirp. Aust. Ed. 2, 2: 75. 1769. 
Potentilla maculata Pourr. Act. Toloss. 3: 326. 1788. 
Potentilla Salisbrugensis Haenke in Jacq. Coll. 2:68. 1788. 
Potentilla rubens Vill. Prosp. Fl. Dauph. 46. 1779. 
Rootstock prostrate, stems ascending, simple, pubes- 
cent, 3/-8’ high. Stipules membranous; basal leaves 
slender-petioled, digitately 5-foliolate (rarely 3-foliolate); 
leaflets obovate, obtuse at the apex, narrowed or cuneate 
at the base, glabrous above, pubescent along the margins 
and on the veins beneath, green both sides, incisely den- 
tate, 6’’-9’’ long; flowers few, terminal, loosely cymose, 
yellow, 6’/-9’’ broad; pedicels slender; petals obovate, 
obcordate, cuneate, yellow, orange-spotted at the base, 
longer than the ovate acutish calyx-lobes; stamens about 
20; style filiform, terminal; achenes glabrous. 
Labrador and Greenland to James Bay. Also in northern 
-and alpine Europe. Summer. 
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