182 ROSACEAE 



PI. 22:370 (1908). 7*! hanscni Greene, Pitt. 3:20 (1896), "middle and high Sierras" (sepals 

 ovate). DrymocaUis hanscni Rydb. Mem. Dept. Bot. Columbia Univ. 2 :200 (1898). P. plandulofia 

 var. (jcnitiiKi f. hmistnii Wolf, Biblio. Bot. ll)"':l."}G (1908). P. (/landiilofia var. fjfnuina f. monti- 

 co/rt\Volf, Biblio. Bot. l(r':]H9 (1908). P. moiiticola Fedde, Just Bot. .Tahresb. 3G-':494 (1908). 

 Var. L.\cTEA Greene, Fl. Fr. 65 (1891), "higher elevations, Kern and Fresno Cos."; Jepson, Man. 

 487 (1925). P. lactca Greene, Pitt. 3:20 (1896). Brymocallis lacica Bydb. N. Am. Fl. 22:369 

 (1908). P. plandulosa var. nevadcnsis Wats. Bot. Cal. 1:178 (1876), in part; not P. nevadensis 

 Boiss. (1838). DrymocaUis gracilis Rydb. Bull. Torr. Club 28:177 (1901), type loe. Pine Ridge, 

 Fresno Co., ilall c}'- ChaiKUcr 13S (more glandular) ; not P. gracilis Dougl. (1830). P. rupestris 

 var. americana Wolf, Biblio. Bot. 16'':129 (1908). Var. austinae Jepson. P. glandulosa var. 

 fissa Jepson, Man. 487 (1925), not P. fissa Nutt. (1840). Var peirsonii Jepson. P. peirsonii 

 Munz, Bull. S. Cal. Acad. 31 :65 (1932). DrymocaUis cuneifolia Rydb. Mem. Dept. Bot. Columbia 

 Univ. 2:204, pi. Ill (1898), tvpc loc. Green Lead Mine, San Bernardino Mts., Farish 1818. P. 

 cuneifolia Wolf, Biblio. Bot. i6"':139 (1908); not P. cuneifolia Bertol. (1863). Var. PUMILA 

 Jepson. DrymocaUis pumila Rydb. N. Am. Fl. 22:372 (1908), type loc. Steins Mt., Ore., Cusich 

 2571. P. pumila Fedde, Just Bot. Jahresb. 36=:494 (1908). P. glandulosa var. monticola Jepson, 

 Man. 487 (1925) ; not Drvmocallis glandulosa var. monticola Rvdb. (1898) or DrymocaUis monti- 

 cola Rydb. (1908). 



6. P. saxosa Lemmon. Desert Cinquefoil. Stems slender, ascending, 4 to 7 

 inches high, these and the leaves tufted; herbage glandular-pubescent; leaves pin- 

 nate, the petioles % to 2 inches long; leaflets 3 to 7 (or 9), broadly ovate or fan- 

 shaped, crenate to deeply sen-ate, 3 to 6 lines long; cymes loose, few-flowered, some- 

 what leafy; flowers small and inconspicuous (2i/^ to 4 lines wide), on filifonu often 

 arcuate pedicels 4 to 9 lines long; bractlets ovate-acute to lanceolate, sometimes 2- 

 cleft; petals lanceolate-acuminate to oblong-acute, white or light yellow, 1 to 1% 

 lines long, not surpassing the calyx-lobes; stamens 25 to 30; achenes 8 to 15, usually 

 faintly ribbed. 



Rock crevices, 300 to 6400 feet : ranges in or bordering the deserts from Mono 

 Co. to the San Bernardino Mts. and southwards to Lower California. ]May-Aug. 



Locs. — Benton Range, Mono Co., Hall 11,882; Sherwin Hill, Mono Co., Peirson 10,719; Deep 

 Springs Valley, White Mts., Purpus 5813; Twenty-nine Palms, Alverson; Cactus Flat, San 

 Bernardino Mts., Munz 10,501. 



Refs. — PoTENTiLLA SAXOSA Lemmon ; Greene, Pitt. 1 :171 (1888), type loc. San Rafael Mts., 

 L. Cal., Lemmon; Jepson, Man. 486 (1925). Horlcelia saxosa Rydb. Mem. Dept. Bot. Columbia 

 Univ. 2:155 (1898). P. rosulata Rydb. Bull. Torr. Club 26:542 (1899), type loc. Twenty-nine 

 Palms, Colorado Desert, A. H. Alverson. P. acuminata Hall, Univ. Cal. Publ. Bot. 1:86 (1902), 

 type loc. Chino Creek, Mt. San Jacinto, Hall 2605. 



7. P. rivalis Nutt. River Cinquefoil. Stems coarse, erect or ascending, 

 usually simple below, 1 to 2 feet high; herbage soft-pubescent, sometimes a little 

 glandular; leaves pinnate with 5 leaflets or the upper often ternate; leaflets oblong 

 or obovate, usually twice as long as wide, incised-serrate or crenate, 1 to lYo inches 

 long; cyme leafj% much -branched, the branches tending to be falsely racemose; 

 flowers about 2^2 lines wide, borne on short pedicels; petals yellow, cuneate-obovate, 

 % to % line long, much exceeded by the calyx-lobes; ripe achenes numerous, 

 smooth or obscurely rugulose. 



Bottom lands, 5 to 500 feet; lower Sacramento and San Joaquin rivers; Colo- 

 rado Desert. North to British Columbia, south to Mexico. Jan.-Apr. 



Locs. — Isleton, Babcock ; Tracy, Bioletii; Cameron Lake, Colorado Desert, T. Brandegee. 



Refs. — PoTENTiLLA RIVALIS Nutt. ; T. cfc G. Fl. 1:437 (1840), type loc. Lewis River, Nuttall; 

 Lehm. Rev. Pot. 196, pi. 61 (1856) ; Rydb. Mem. Dept. Bot. Columbia Univ. 2:42, pi. 7 (1898) ; 

 Jepson, Man. 486 (1925). Tridophyllum rivals Greene, Lflts. 1:189 (1905). 



8. P. leucocarpa Rydb. Sand Seed. Stems slender, prostrate, spreading or 

 erect, freely branched from the base upward (the branches often floriferous to the 

 base), % to 1^ feet high; herbage pubescent; leaves mostly cauline, all ternately 

 compound, the petioles short (I/2 to 9 lines) or the basal and sub-basal to 11^4 inches 

 long; leaflets cuneate-obovate, serrate-incised at apex (or above the middle), V2 to 

 1 inch long; cymes very leafy, the flowers numerous, congested towards the ends of 

 the branches, appearing racemose; flowers 1^ to 2 lines wide, on pedicels 2 to 6 



