ROSE FAMILY 419 



lanceolate sepals, these about 5 mm. long ; petals oblong-spatulate, rounded at the apex, about a 

 third longer than the sepals. 



Dry grassy slopes of open pine forests, Upper Sonoran and Arid Transition Zones; Lake County to Mon- 

 terey County, California, in the Inner Coast Ranges chiefly. Type locality: dry alkaline soil near Clear Lake, 

 Lake County, California. June-Aug. 



Horkelia Bolanderi subsp. Parryi (S. Wats.) Keck, Lloydia 1: 92. 1938. (Horkelia Parryi Rydb. Mem. 

 Dept. Bot. Columbia Univ. 2: 129. 1898, not Greene; H. bernardina Rydb. N. Amer. Fl. 22: 273. 1908; H. 

 Rydbergii Elmer, Bot. Gaz. 39: 50. 1905.) Closely resembling the tyjpical form, but leaves more broadly 

 cuneate, and pubescence more appressed. Open pine forests; Santa Lucia Mountains, Mount Pinos and San 

 Bernardino Mountains, California. 



11. Horkelia marinensis (Elmer) Crum. Point Reyes Horkelia. Fig. 2389. 



Horkelia Bolanderi var. marinensis Elmer, Bot. Gaz. 41 : 321. 1906. 

 Potentilla Kelloggii var. marinensis Jepson, Fl. Calif. 2: 199. 1936. 

 Horkelia marinensis Crum ex Keck, Lloydia 1: 91. 1938. 



Stems several, from a stout branching matted caudex, 12-20 cm. high, pilose-tomentose 

 and glandular, fragrant. Basal leaves densely tufted, 4-6 cm. long, short-petioled ; leaflets 7-10 

 pairs, densely shaggy-villous canescent, cuneate-obovate, palmately lobed into 3-7 segments ; stem 

 leaves few, much reduced; cymes compact and subcapitate; hypanthium coarsely pilose, 1.5 mm. 

 deep ; sepals 5-6 mm. long ; petals about 5 mm. long ; pistils about 25 ; filaments all dilated, 

 often pink. 



Seacoast, usually on or near dunes, Humid Transition Zone; Mendocino County to Marin County, Cali- 

 fornia. Type locality: Point Reyes, Marin County, California. May-Aug. 



12. Horkelia tenuiloba (Torr.) A. Gray. Santa Rosa Horkelia. Fig. 2390. 



Horkelia fusca var. tenuiloba Torr. Pacif. R. Rep. 4: 84. 1857. 

 Horkelia tenuiloba A. Gray, Proc. Amer. Acad. 6: 529. 1865. 

 Potentilla tenuiloba Greene, Pittonia 1: 105. 1887. 

 Potentilla Micheneri Greene, Erythea 1 : 5. 1893. 

 Potentilla stenoloba Greene, Erythea 3: 36. 1895. 

 Horkelia Micheneri Rydb. Bull. Torrey Club 25: 54. 1898. 



Stems 1-2 dm. high, with a short woody caudex and a horizontal rootstock, hirsute-villous, 

 mostly simple, stipules often pectinate-toothed. Leaflets of basal leaves 6-10 pairs, about 1 cm. 

 long, divided almost to the base into linear segments, canescent-hirsute ; cyme dense, often sub- 

 capitate; hypanthium 5 mm. broad, hirsute; bractlets linear-filiform; sepals broadly lanceolate, 

 4 mm. long ; petals oblong, scarcely exceeding the sepals, notched at the apex. 



Dry ridges. Upper Sonoran Zone: Sonoma County to San Luis Obispo County, California. Type locality: 

 "Laguna of Santa Rosa Creek, California." April-July. 



13. Horkelia hispidula Rydb. White Mountains Horkelia. Fig. 2391. 



Horkelia hispidula Rydb. N. Amer. Fl. 22: 278. 1908. 

 Potentilla hispidula Jepson, Man. Fl. PI. Calif. 493. 1925. 



Stems slender from an erect caudex, 2 dm. high, sparingly hirsute and glandular-puberulent. 

 Leaflets of basal leaves 7-12 pairs, rather crowded, cuneate-flabelliform, 4-6 mm. long, divided 

 to near the base into 3-6 spatulate segments, densely short-hirsute ; cyme with ascending branches, 

 3-4-flowered ; hypanthium 4 mm. broad, sparingly pilose and glandular ; sepals lanceolate, acu- 

 minate, 4 mm. long, exceeding the narrowly linear bractlets ; petals obcordate, 5 mm. long. 



A little known species originally collected under pines among rocks, White Mountains, California, at an alti- 

 tude of 3,300 meters. June— Aug. 



14. Horkelia Hendersonii Howell. Henderson's Horkelia. Fig. 2392. 



Horkelia Hendersonii Howell, Pacif. Coast PI. Coll. 1887: 2. 1887. 



Stems simple, about 1 dm. high, from a thick cespitose caudex, hirsute-villous ; stipules 

 lanceolate, mostly entire. Basal leaves numerous, densely canescent-hirsute ; leaflets rather 

 crowded, 5-8 pairs, cuneate, about 5 mm. long, incised into 4-6 unequal oblong lobes ; cymes 

 dense ; hypanthium cup-shaped, 4 mm. broad ; sepals 4 mm. long, longer than the linear-filiform 

 bractlets ; petals oblong-linear, usually shorter than the sepals. 



Mountain slopes, Canadian Zone; Mount Ashland, Siskiyou Mountains, southern Oregon. Type locality: 

 "Summit of Ashland Butte," Oregon. June-Aug. 



15. Horkelia sericata S. Wats. Howell's Horkelia. Fig. 2393. 



Horkelia sericata S. Wats. Proc. Amer. Acad. 20: 364. 1885. 

 Potentilla Howellii Greene, Pittonia 1: 104. 1887. 

 Potentilla sericata Greene, loc. cit. 



Potentilla laxiflora Drew, Bull. Torrey Club 16: 151. 1889. 

 Horkelia laxiflora Rydb. Bull. Torrey Club 25: 55. 1898. 

 Horkelia Howellii Rydb. loc. cit. 



Stems several from a short caudex, slender, simple, sparsely villous. Leaflets of basal leaves 

 5-20 pairs, very crowded, 3-10 mm. long, ovate-oblong, entire or usually cleft to the base into 

 2-3 similar segments, more or less villous ; cyme few-flowered with elongate branches and very 

 short pedicels ; hypanthium silky-villous and glandular. 3-4 mm. broad ; sepals lanceolate, 3 mm. 



