438 ROSACEAE 



fruit; sepals lanceolate, acute, about 5 mm. long; bractlets oblong, obtuse, about half as long 

 as the lobes ; petals obcordate, exceeding the sepals. 



Open pine forests, Transition Zone; Monterey Peninsula, California. Type locality: near the reservoir of 

 Pacific Grove, California. April-Aug. 



Potentilla versicolor Rydb. N. Amer. Fl. 22: 344. 1908. Stems decumbent or ascending from a thick 

 caudex, 2 dm. high, sparingly appressed-silky. Basal leaves pinnate, 5-10 cm. long, tomentose when young, 

 greener in age: leaflets 15-25, 5-8 mm. long, cuneate or flabelhform, divided to near the base into 3-7 linear- 

 oblong acutish segments; flowers in an open 3-6-flowered cyme; sepals lanceolate acute 3 imp. long, a third 

 longer than the elliptical or oval bractlets, hirsute; petals obcordate, 5 mm long. The status of this species 13 

 doubtful, for it is known only from a single collection, Grayhart Buttes, Oregon, Covtlle ir Leioerg 50/. 



28. Potentilla Drummondii Lehm. Drummond's Cinquefoil. Fig. 2442. 



Potentilla Drummondii Lehm. Stirp. Pug. 2: 9. 1830. 



Potentilla dissecta var. Drummondii Kurtz, Bot. Jahrb. 19: 374. 1894. 



Potentilla Drummondii var. cascadensis (Rydb.) Th. Wolf, Bibl. Bot. 16, Heft 71 : 492. 1908. 



Potentilla anomalofolia M. E. Peck, Proc. Biol. Soc. Wash. 49: 110. 1936. 



Stems erect from a short caudex, 3-6 dm. high, slightly hirsute. Basal leaves sparsely hir- 

 sute 5-10 cm. long; leaflets 2-5 cm. long, obovate-cuneate, deeply incised with linear-oblong 

 or lanceolate, acute teeth ; flowers long-pedicelled ; sepals ovate-lanceolate, acuminate, longer than 

 the lanceolate bractlets ; petals obcordate, 6-10 mm. long. 



Boreal Zones; British Columbia to Alberta and southern Sierra Nevada, California. Type locality: "Rocky 

 Mountains north of Smoking River in latitude 56°." May-Aug. 



29. Potentilla multijuga Lehm. Coast Cinquefoil. Fig. 2443. 



Potentilla multijuga Lehm. Ind. Sem. Hamb. 1849: 6. 1849. 



Stems erect, 3-7 dm. high from a stout taproot, sparsely strigose, more or less leafy. Basal 

 leaves numerous, pinnate, 20-30 cm. long, slightly hairy or glabrate ; leaflets usually 13-^7, 

 obovate-cuneate, 1-4 cm. long, coarsely toothed above the middle ; pedicels slender, 2-4 cm. 

 long ; sepals ovate, acute, 5-6 mm. long, a third longer than the oblong bractlets ; petals obcor- 

 date, about a third longer than the sepals. 



A little known species, occurring in low coastal flats near Playa del Rey, Los Angeles County, California. 

 Type locality: California. June- Aug. 



30. Potentilla fruticosa L. Shrubby Cinquefoil. Fig. 2444. 



Potentilla fruticosa L. Sp. PI. 495. 1753. 



Dasiphora riparia Raf. Aut. Bot. 167. 1838. 



Dasiphora fruticosa Rydb. Mem. Dept. Bot. Columbia Univ. 2: 188. 1898. 



Much branched shrub, with very leafy erect or ascending stems, 2-12 dm. high, the bark 

 shreddy. Leaflets 3-7, linear to oblong, entire, acute at each end, 0.5-2 cm. long, silky-pubescent, 

 the margins revolute ; flowers in small loose cymes or solitary ; bractlets linear-oblong, usually 

 a little longer than the ovate, acuminate sepals ; petals yellow, orbicular, 5-15 mm. long. 



Open meadows or moist rocky slopes, Boreal Zones; Alaska to Labrador, California, New Mexico, and New 

 Jersey; also in Europe and Asia. Type locality: England. June-Aug. 



31. Potentilla Anserina L. Common Silver-weed. Fig. 2445. 



Potentilla Anserina L. Sp. PI. 495. 1753. 



Potentilla argentina Huds. Fl. Angl. 195. 1762. 



Fragaria Anserina Crantz, Stirp. Aust. 2: 9. 1763. 



Argentina vulgaris Lam. Fl. Franc. 3:119. 1778. 



Argentina Anserina Rydb. Mem. Dept. Bot. Columbia Univ. 2: 159. 1898. 



Basal leaves 1-2 dm. long, with about 9-31 larger leaflets interspersed with smaller ; petioles 

 and rachis long-hairy ; larger leaflets 1-4 cm. long, oblong or oblong-lanceolate, white-silky and 

 tomentose beneath, green and sparsely silky above ; pedicels 3-10 cm. long ; sepals broadly ovate ; 

 petals oval, 7-10 mm. long ; achenes corky, grooved at the upper end. 



Native of Europe and Asia and in North America, Manitoba to New Mexico, southern California, and 

 Alaska Type locality: in Europe. The plants of Western America differ from the European and the apparently 

 introduced plants of eastern North America by the more obovate leaflets rounded at the apex and the broader 

 ovate or triangular teeth. April-Oct. 



Potentilla Anserina var. sericea Hayne, Arzn. Gew. 4: 31. 1816. (P. Anserina _ var. argentea (Rydb.) 

 Jepson Man Fl PI Calif 485. 1925.) Upper surface of leaflets silvery-sericeous. Probably not more than an 

 ecological form, associated with drier habitats, away from the coast, Oregon to California and across the continent, 

 also in Europe. 



32. Potentilla pacifica Howell. Pacific Silver-weed. Fig. 2446. 



Potentilla Anserina var. grandis Torr. & Gray, Fl. N. Amer. 1: 444. 1840. 



Potentilla pacifica Howell, Fl. N.W. Amer. 1: 179. 1898. 



Argentina Anserina var. grandis Rydb. Mem. Dept. Bot. Columbia Univ. 2: 161. 1898. 



Argentina pacifica Rydb. N. Amer. Fl. 22: 353. 1908. 



Argentina grandis Piper in Piper & Beattie, Fl. Northw. Coast 211. 1915. 



Argentina occidentalis Rydb. N. Amer. Fl. 22: 354. 1908. 



Basal leaves mostly erect, 2-4 dm. long, the petioles and rachis mostly with appressed pu- 

 bescence or almost glabrous; larger leaflets 15-25, obovate or oval, the upper 4-6 cm. long, 

 coarsely serrate, glabrous or nearly so above, white-silky and tomentose beneath ; peduncles l-i 

 dm long; hypanthium silky; bractlets lanceolate, 6-8 mm. long; sepals ovate, 5-6 mm. long; 

 petals broadly obovate, 10-12 mm. long ; achenes neither grooved nor corky. 



Moist ground near the coast, Alaska to southern California. Type locality: Oregon. April-Aug. 



