PAR? 3, 1908] ROSACEAE 273 
on slender pedicels, 3-8 mm. long; hypanthium glabrate, saucer-shaped, about 2 mm. in 
diameter ; bractlets linear-oblong, obtuse or acutish, 1 mm. long; sepals lanceolate, 2 mm. 
long; petals obovate, white, about equaling the sepals; achenes few. 
TYPE LOCALITY : Along trail leading from Barton Flat to South Fork of Santa Ana River, San 
Bernadino Mountains, California. 
DISTRIBUTION : Known only from the type locality. 
7. Horkelia Rydbergii Elmer, Bot. Gaz. 39: 50. 1905. 
Low prostrate perennial forming dense mats ; stems decumbent, 1-2 dm. long, densely 
canescent; stipules lanceolate, entire, about 15mm. long; basal leaves numerous, clustered 
at the base, 4-6 cm. long, densely canescent with short silky hairs; leaflets 8-12 pairs, 
about 5mm. long, sessile, broadly cuneate, 3-7-toothed ; stem-leaves smaller and with fewer 
leaflets ; inflorescence loosely cymose ; pedicels usually short; hypanthium canescent, cupu- 
late, 5 mm. broad in fruit; bractlets 2 mm. long, lanceolate ;. sepals lanceolate, 3 mm. 
long, acute; petals cuneate, oblong or obovate, 3-4 mm. long; achenes 1 mm. long, brown. 
TYPE LOCALITY: Dry gravelly flat near Griffin’s Postoffice, Ventura County, California. 
DISTRIBUTION : Known only from the type locality. 
Mey, 
8. Horkelia Kelloggii Greene, Bull. Calif. Acad. 2: 416. 1887. 
Horkelia californica sericea A. Gray, Proc, Am. Acad. 6: 529. 1865. 
Potentilla Kelloggii Greene, Pittonia 1: 101. 1887. Nov. 
Potentilla californica sericea K. Brand. Zoe 2: 349. 1892. 
Horkelia sericea Rydb. Bull. Torrey Club 25: 56. 1898. 
Perennial, with a rootstock and short woody caudex; stem stout, 3-6 dm. high, ascend- 
ing, or rarely nearly prostrate, silky-pubescent, not glandular ; stipules ovate or lanceolate, 
1-2 em. long, often toothed; basal leaves numerous, rather short-petioled, pinnate ; leaflets 
4-7 pairs, rather thick and with prominent veins, densely and finely silky-pubescent, obo- 
vate, 1-2.5 cm. long, coarsely toothed, the upper confluent ; stem-leaves similar but smaller, 
with 2-5 pairs of leaflets; cyme rather dense ; hypanthium densely silky-canescent, cupulate, 
about twice as wide as deep; bractlets and sepals entire, ovate or lance-ovate, of nearly the 
same length, 5-6 mm. long, acute; petals white, spatulate, 5-6 mm. long, rounded at the 
apex. 
TYPE LOCALITY : Oakland, near San Francisco, California. 
DISTRIBUTION : Central and southern California, near the coast. 
ILLUSTRATION : Mem. Dep. Bot. Columbia Uniw. 2: p/. 60. 
9. Horkelia Clevelandi (Greene) Rydb. Bull. Torrey 
Club 25: 54. 1898. 
Potentilla Clevelandi Greene, Pittonia 1: 102. 1887. 
Perennial, with a scaly rootstock and short caudex; stems several, simple, 2-4 dm. 
high, finely pubescent, very rarely a little glandular above, often reddish-tinged ; stipules 
ovate, 5-8 mm. long, often toothed; basal leaves numerous, short-petioled ; leaflets 7~11 
pairs, densely and finely pubescent, not at all glandular, obovate-cuneate to nearly reni- 
form, deeply crenate-toothed at the apex, entire at the base, 5-10 mm. long; stem-leaves 
smaller, with fewer cuneate or oblong leaflets; cyme with rather short erect or spreading 
branches; hypanthium finely pubescent, little if at all glandular, cupulate with the depth 
about one-half the width ; -bractlets ovate, a little shorter than the ovate-lanceolate acute 
sepals, which are about 4 mm. long; petals spatulate-oblong, a little exceeding the sepals, 
truncate or rounded at the apex. 
Type LocaLity : Laguna, in the mountains back of San Diego, California. 
DISTRIBUTION : Southern California and northern Lower California. 
ILLUSTRATION : Mem. Dep. Bot. Columbia Univ. 2: p/. 62. 
10. Horkelia bernardina Rydberg. 
J landeri Parryi S. Wats. Bot. Calif. 1: 182. 1876. ; 
Horkelia yee “Rydb. Mem. Dep. Bot. Columbia Univ. 2: 129. 1898. Not 47. Parry Greene, 
1887. 
Perennial, with a scaly rootstock and a short woody branched caudex ; stems numerous, 
simple, 2-4 dm. high, grayish-strigose, not at all glandular; stipules ovate to ovate-lanceo_ 
