430 ROSACEAE 



5. Potentilla biennis Greene. Biennial CinquefoiL Fig. 2419. 



Potentilla biennis Greene, FI. Fran. 1: 65. 1891. 



Potentilla lateriflora Rydb. Bull. Torrey Club 23: 261. 1896. 



Tridophyllum bienne Greene, Leaflets Bot. Obs. 1 : 189. 1905. 



Stems several with erect branches, 3-5 dm. high, rather densely pubescent and glandular- 

 viscid. Leaves 3-foliolate, more or less pubescent ; leaflets broadly obovate, 2-4 cm. long, coarsely 

 crenate; cymes often appearing like leafy racemes; hypanthium glandular-pubescent; bractlets a 

 little narrower and shorter than the ovate-acute sepals; petals yellow, much shorter than the 

 sepals ; stamens about 10 ; achenes whitish, smooth. 



Moist, usually sandy soils, mainly Transition Zone; British Columbia and Saskatchewan to Colorado, Arizona, 

 and Lower California. Type locality: Butte County, California. May-Aug. 



6. Potentilla monspeliensis L. Rough Cinquefoil. Fig. 2420. 



Potentilla monspeliensis L. Sp. PI. 499. 1753. 



Potentilla grossa Dougl. ex Hook. Fl. Bor. Amer. 1 : 193, as synonym. 1832. 



Tridophyllum monspeliensis Greene, Leaflets Bot. Obs. 1 : 189. 1905. 



Stems erect, stout, branched above, 2-7 dm. high, hirsute. Leaves 3-foliolate, more or less 

 hirsute; leaflets 3-5 cm. Long, narrowly obovate, serrate with broad teeth; cyme leafy; hypan- 

 thium hirsute, 7-8 mm. broad ; sepals 4-5 mm. long ; bractlets about equaling the lobes in length 

 but narrower ; petals yellow, nearly equaling the sepals ; stamens generally 20 ; achenes rugulose 

 when mature. 



Moist rich soils, Transition and Boreal Zones; Alaska and Labrador to Mexico, also in Europe and Asia. 

 Type locality: Botanical Garden, Montpellier, France. June— Sept. 



7. Potentilla Newberry i A. Gray. Newberry's Cinquefoil. Fig. 2421. 



Potentilla Newberryi A. Gray, Proc. Amer. Acad. 6: 532. 1865. 



Potentilla Newberryi var. arenicola Rydb. Mem. Dept. Bot. Columbia Univ. 2: 112. 1898. 



Stems erect or spreading, from a biennial or perhaps perennial root, 2-4 dm. high, sparsely 



silky-villous. Basal leaves pinnate, silky-villous ; leaflets 3-10 pairs, divided to near the base 



into 3-5 oblong-spatulate segments ; stem leaves similar but shorter and with 2-4 less divided 



leaflets ; cyme diffuse, the pedicels slender, recurved ; hypanthium villous, about 5 mm. broad ; 



sepals ovate-lanceolate, 4 mm. long, the bractlets similar ; petals white, obcordate, exceeding the 



sepals ; stamens 20 ; receptacle beset with bristles. 



Upper Sonoran Zone; eastern Oregon and northeastern California. Type locality: banks of Rhett Lake, 

 California or Oregon. May-July. 



8. Potentilla pseudosericea Rydb. Strigose Cinquefoil. Fig. 2422. 



Potentilla pseudosericea Rydb. Mem. Dept. Bot. Columbia Univ. 2: 98. 1898. 



Perennial, with a short cespitose caudex, the stems 1-4 dm. high, densely puberulent and 

 villous with long spreading hairs. Basal leaves with 7-11 leaflets; petioles puberulent and long- 

 villous with spreading hairs ; leaflets 1-5 cm. long, oblanceolate, green above and strigose- 

 pubescent, canescent beneath with a dense tomentum, deeply cleft with linear or linear-lanceolate 

 revolute lobes ; flowers congested ; hypanthium 5-7 mm. broad, villous ; sepals ovate 5, long, 

 slightly exceeding the lanceolate bractlets; petals obovate, about 7 mm. long; stamens 20; styles 

 glandular at base. 



Dry plains and hillsides, Arid Transition and Boreal Zones; eastern British Columbia and plains of the 

 Hudson Bay to Kansas and New Mexico. White Mountains, California, is the only known locality in the Pacific 

 States. Type locality: plains of the Missouri. May-June. 



9. Potentilla gracilis Dougl. Slender Cinquefoil. Fig. 2423. 



Potentilla gracilis Dougl. ex Hook. Bot. Mag. pi. 2984. 1830. 



Potentilla longipedunculata Rydb. Mem. Dept. Bot. Columbia Univ. 2: 39. 1898. 



Potentilla macropetala Rydb. N. Amer. Fl. 22: 313. 1908. 



Stems erect or ascending, slender, 4-7 dm. high, more or less silky-villous. Stipules lanceo- 

 late, entire or with 1 or 2 teeth ; basal leaves digitate with 5-7 leaflets, the petioles slender, silky- 

 villous ; leaflets oblanceolate, 3-6 cm. long, green but more or less silky-pubescent above, densely 

 and finely white-tomentose beneath, divided about half way to the midrib into lanceolate-triangu- 

 lar coarse teeth; cyme many-flowered; hypanthium silky-pubescent, 8-10 mm. broad in fruit; 

 bractlets lanceolate, shorter than the acuminate sepals ; petals obcordate, often over 1 cm. long ; 

 stamens about 20. 



Usually in moist places, stream banks or mountain meadows, Transition and Boreal Zones; coastal Alaska 

 and British Columbia southward west of the Cascade Mountains to northern California. Type locality: banks of 

 the Columbia River. May-July. 



10. Potentilla glomerata A. Nels. Great Basin Cinquefoil. Fig. 2424. 



Potentilla glomerata A. Nels. Bull. Torrey Club 26: 480. 1899. 

 Potentilla dichroa Rydb. N. Amer. Fl. 22: 319. 1908. 



Stems stout, erect, 4-8 dm. high, rather densely pubescent. Basal leaves 7-foliolate, green but 

 densely appressed-pubescent above, more or less tomentose beneath ; leaflets oblanceolate, 4-8 cm. 

 long, toothed nearly half way to the midrib, the teeth lanceolate; cyme at first congested, but 

 later more open ; sepals acuminate, 5-8 mm. long ; petals 6-8 mm. long. 



Low moist ground, Arid Transition and Upper Sonoran Zones; eastern Washington and Montana south to 

 northeastern California and Utah. Type locality: Bear River at Evanston, Wyoming. June-Aug. 



