184 ROSACEAE 



11. P. pennsylvanica L. var. strigosa Pursh. Prairie Cinquefoil. Stems 

 several, erect or aseendinj;, 4 to 9 inclies hipli; herbage pilose; leaves chiefly basal, 

 the stems bearinj? 2 or 3 reduced leaves ; stems and petioles pilose, the under side of 

 leaves closely prray-pubescent, the upper side green and thinly pubescent; leaves 

 pinnate, the blade's 1 to 3 inches long, on petioles Vo to nearly as long; leaflets (5 or) 

 9 to 11, 8 to 11 lines long, broadly oblong, pinnately cleft to below middle into 

 regular linear-oblong segments, the segments with revolute margins; cyme 5 to 7 

 (or 10) -flowered; flowers 3 to 5 lines wide, on ascending pedicels 5 to 10 lines long; 

 petals yellow, erect, roundish-obovate, truncatish or obtuse, 11/2 to 2 lines long ; 

 stamens 11 or 16 to 19. 



Alpine meadows, 11,100 feet: White Mts. East to the Rocky Mts., north to 

 Canada. Julj'-Aug. 



Locs.— "White Mts.: County Line Hill, Jepson 7359. Utah: Bear Eiver, Summit Co., Pay- 

 son 4870. 



Var. ovium Jepson var. n. Stems decumbent or diffuse, 2 to G inches high ; root-cro^vn densely 

 and regularly imbricated with the persistent stipular scales, the scales red-brown, 9 lines long, 3 

 lines wide ; leaflets usually 5, the teeth narrow, spreading or remote ; cymes few-flowered, con- 

 gested, the peduncles more or less recurved. — (Caules decumbentes vel decumbenti-ascendentea 

 unc. 2-6 alti ; f oliola plerumque 5, dentibus angustis, patulis vel remotis ; cymae pauciflorae, con- 

 gestae, pedunculis plus minusve recurvati.) — Alpine slopes, 11,100 to 11,400 feet; White Mts. 

 (Sheep Mt., Jepson 7307, type; North Fork Crooked Creek, Jepson 7342). 



Eefs. — PoTENTiLLA PENNSYLVANICA L. Mant. 1:76 (1767), type from Canada. Var. strigosa 

 Pursh, Fl. 356 (1814), type loc. "on the Missouri," Lewis; Eydb. Mem. Dept. Bot. Columbia Univ. 

 2:97, pi. 38 (1898) ; Jepson, Man. 487 (1925). P. strigosa Pall.; Pursh, I.e. as synonym; not P. 

 strigosa Bunge (1830). Var. ovium Jepson. 



12. P. pseudosericea Rydb. Mono Cinquefoil. Stems spreading, 1 to 4 

 inches long, these and the leaves caespitose; herbage densely white-silky; lower 

 stipules brown and scarious; leaves palmate, sometimes a little pinnate; leaflets 5 

 or 3, divided into linear obtuse segments, 3 to 5 lines long ; cyme few-flowered, con- 

 gested, its branches and pedicels somewhat arcuate; flowers 3 lines wide; petals 

 light yellow, obovate, 1 to IV2 lines long, equaling or slightly exceeding the calyx- 

 lobes; stamens 20; styles thickish, glandular-papillose at base; achenes numerous. 



Alpine slopes, 11,000 to 13,000 feet: Sierra Nevada (east side or easterly sum- 

 mits) from Tulare Co. to j\Iono Co. ; White Mts. East to the Rocky Mts. Jiily-Aug. 



Tax. note. — The California plants usually referred to Potentilla rubricaulis Lehm. are here 

 included in P. pseudosericea. P. rubricaulis, collected "about Bear Lake, latitude 66 in the 

 American Arctic", has never been rediscovered. According to Wolf (Monog. Pot. 170), who saw 

 the original specimens, the plants are about 8 inches high, the stems stoutish, the flowers 6 or 7 

 lines in diameter, the leaves 2 to 5 inches long — altogether a much more robust plant, and also 

 with minor structural differences. It is no doubt closely related to P. pseudosericea Eydb. but 

 the evidence indicates that these two names represent specifically distinct forms. A series of 

 specimens from the White Mts., east of the Sierra Nevada, shows considerable variation in the 

 amount of pubescence on the upper surface of the leaves but no specific distinctions. 



Locs. — Sierra Nevada: Olancha Peak, Tulare Co., Purpus 1865; Mono Pass, Theo. La- 

 bouchere. White Mts.: McAfee Mdws., Duran 2616b; Sheep Mt., Jepson 7319; White Mountain 

 Peak, Jepson 7389. 



Var. grandiflora Wolf. Flowers 4 to 5 (or 7) lines broad, the petals much exceeding the 

 sepals; styles stout. — Alpine meadows, 12,000 to 13,000 feet: White Mts. (Sheep Mt., Jepson 

 7314 ; Cottonwood Creek, Duran 1635 ; White Mountain Peak, Jepson 7394). This variety is very 

 similar in aspect to P. breweri Wats., differing chiefly in the thicker and shorter styles, a sectional 

 character. It ranges far northward. 



Eefs. — Potentilla pseudosericea Rydb. Mem. Dept. Bot. Columbia Univ. 2:98, pi. 36, figs. 

 1-5 (1898), type loc. White Mts., Mono Co., Cal., ShocMey 592 (erroneously attributed to Nevada 

 by Eydberg) ; Jepson, Man. 488 (1925). P. holosericea Nutt. ; Eydb. I.e., as synonym; not P. 

 holosericea Griseb. (1843). P. rubricaulis Jepson, Man. 488 (1925), in part; not P. rubricaulis 

 Lehm. (1830). Var. grandiflora Wolf, Biblio. Bot. 16^:153 (1908), type from "North-west 

 America." 



13. P. multijuga Lehm. Lost Cinquefoil. Stems few, slender, ascending, 1 

 to 2 feet high; herbage strigose to glabrate; leaves pinnate; basal leaves many, the 

 blades % to 1 foot long, with 11 to 27 leaflets, the petioles 2^ to 5 inches long; 



