202 ROSACKAE 



Var. INDICTA Jepson, Man. 493 (1925), type loc. Crane Creek, w. Tehama Co., Jepson lOOp. 

 Eorkclia caruifolia Rydb. ; Howell, Fl. Nw. Am. 181 (1898), type loc. sw. Ore.; Mem. Dept. Bot. 

 Columbia Univ. 2:141, pi. 79 (1898), type loc. Ashland, Ore., Howell 685, 1129. 



44. P. howellii Greene. Klamath IIoxey-dew. Stems suberect or ascending, 

 slender, arising irom a simple root-crown, 9 to 12 inches high, the leaves mostly 

 basal; herbage green, sparsely villous; leaves pinnate, the ba.sal with blades lYo 

 to 5 inches long; petioles i/o to 2i/i inches long; leaflets 11 to 23, 21/2 to 4 lines long, 

 2 to 4-cleft almost to base into oblong or linear-lanceolate segments; stipules of 

 basal leaves finely 2 or 3 times dichotomously filiform-divided, villous; cymes dicho- 

 tomous, with spreading or divaricate branches ending in 2 or 3-flowered clusters; 

 flowers 4 to 5 lines wide; calj'x-lobes narrowly lanceolate; petals white, obovate, 

 emarginate or truncatish, exceeding the calyx-lobes; stamens 10; filaments dilated, 

 unequal; achenes 2 or 3, light brown, smooth. 



Hill slopes, 1400 to 3000 feet : Humboldt Co. to Del Norte Co. North to south- 

 western Oregon. June-Aug. 



Locs. — Hy-am-pum, e. Humboldt Co.; betw. Sommes Bar and Jims ranch, Klamath Elver, 

 Chandler 1543; Gasquet, Del Norte Co., M. S. Baker 219. S. Ore.: Merlin, Henderson 1407. 



Refs. — PoTENTiLLA HOWELLII Greene, Pitt. 1:104 (1887), type loc. Waldo, Ore., Howell. 

 Horkelia howellii Eydb. Bull. Torr. Club 25:55 (1898) ; Mem. Dept. Bot. Columbia Univ. 2:142, 

 pi. 81, figs. 1-5 (1898). P. laxiflora DreAv, Bull. Torr. Club 16:151 (1889), type loc. Hy-am-pum 

 Valley, Humboldt Co., Chesnut 4- Brew; Jepson, Man. 494 (1925). Horkelia laxiflora Eydb. 

 Bull. Torr. Club 25:55 (1898), Mem. Dept. Bot. Columbia Univ. 2:141, pi. 80 (1898). 



45. P. sericata Greene. Silky Honey-dew. Stems slender or filiform, erect 

 from a branched root-crown, purplish, thinly pubescent or glabrate, 8 to 15 inches 

 high, the leaves mostly basal, the cauline few and small; leaves slender, silvery- 

 villous, densely crow^ded with leaflets, the blades 1 to 2 inches long; petioles l^ to 

 % inch long; leaflets 13 to 27, 11/2 to 4 lines long, divided to the base into 2 or 3 

 segments, the segments oblong or oval, entire, or 1 to 3-toothed; stipules deeply 

 2-cleft and hairy; cymes loosely dichotomous with long slender forks ending in 

 clusters of 2 or 3 flowers, rarely congested; flowers 3 to 4 lines wide; calyx-tube 

 turbinate to hemispherical; petals white with pinkish center, cuneate, retuse, 

 exceeding the calyx-lobes; stamens 10; filaments broadly dilated, those opposite 

 the petals shorter, less broad; achenes 3 to 5, smooth. 



Red soil of open flats, 2500 to 3000 feet : Del Norte Co. Extends into Curry 

 Co., southwestern Oregon. June-July. 



Locs.— Eed Hill, Jepson 2901; Gasquet, Peirson 3749. Sw. Ore.: Waldo, Howell. 



Eefs. — PoTENTiLLA SERICATA Greene, Pitt. 1:104 (1887). Horkelia sericata Wats. Proe. 

 Am. Acad. 20:364 (1885), type loc. "summit of the Coast Eange," Curry Co., sw. Ore., Howell. 

 P. howellii Jepson, Man. 494 (1925) ; not P. howellii Greene (1887). 



46. P. parrjri Greene. Chamise Honey-dew. Stems ascending, a little leafy, 

 4 to 8 inches high, offsetting by stolons and forming mat-like colonies 2 to 4 feet 

 wide; herbage soft-pubescent; leaves pinnate, the blades 1% to 4 inches long; peti- 

 oles 1/2 to nearly as long; leaflets 7 to 13, cuneate, toothed at apex, 4 to 6 lines long; 

 cyme diffuse, few- to several-flowered; flowers 4 to 5 (or 6) lines wide, on slender 

 drooping pedicels 5 to 7 lines long; calyx-tube subrotate, 1 line wide, 14 line high; 

 petals white, obovate, obtuse, entire or toothed laterally at apex, exceeding the 

 calyx-lobes; stamens 10; filaments oblong-lanceolate, those opposite the calyx-lobes 

 longer and nearly twice as wide; achenes 7 to 12, gray, minutely reticulate. 



Thin soil of the hills, often in shade of Adenostoma fasciculatum, 300 to 500 

 feet : Sierra Nevada foothills from Amador Co. to Calaveras Co. Apr.-June. 



Locs. — Buena Vista, Amador Co., Jepson 9962; lone, Amador Co., Crum 1104; Eldorado 

 reservoir, Calaveras Co., Davy 1631. An extremely restricted endemic, its range will doubtless 

 be somewhat extended by further exploration, especially northward. 



Note on distribution. — Potentilla parryi and its var. wilderae differ by a number of more 

 or less trivial distinctions, such as flower size and the shape of bractlets and calyx-lobes. More 



