276 NORTH AMERICAN FLORA [VoLuME 22 
17. Horkelia Hendersonii Howell, Pacif. Coast Pl. 
Coll. 1887: [2]. 1887. 
Perennial, with a cespitose, thick, woody caudex; stems about 1 dm. high, hirsute- 
villous, tinged with red or purple, simple and few-leaved; stipules lanceolate, mostly 
entire; basal leaves numerous; leaflets 5-8 rather crowded pairs, densely canescent-hirsute, 
in age often ferruginous; cyme dense; hypanthium cup-shaped, hirsute, more or less pur- 
plish, about 4 mm. in diameter; bractlets linear-filiform, shorter than the lanceolate sepals, 
which are about 4 mm. long; petals oblong-linear, generally shorter than the sepals, 
obtuse. 
TyPE LocaLity: [Not given in the original, but supplied in Howell’s Flora of Northwest 
America.] Top of Ashland Butte, Siskiyou Mountains, Oregon. 
DISTRIBUTION : Siskiyou Mountains in southern Oregon. 
ILLUSTRATION : Mem. Dep. Bot. Columbia Univ. 2: pi. 67, f. 6-10. 
18. Horkelia tenuiloba (‘Torr.) A. Gray, Proc. Am. 
Acad. 6: 529. 1865. 
Horkelia fusca tenuiloba Torr. Pacif. R. R. Rep. 4: 84. 1857. 
Potentilla tenuiloba Greene, Pittonia 1: 105. 1887. net Jochen 185%. 
Potentilla stenoloba Greene, Etythea 3: 36. 1895. 
Perennial, with a horizontal rootstock and short woody caudex; stems 1-2 dm. high, 
more or less tinged with brown, hirsute-villous, not at all glandular, mostly simple; stipules 
ovate-lanceolate, often pectinately toothed ; basal leaves numerous, pinnate, more or less 
grayish-hirsute; leaflets 6-10 pairs, about I cm. long, divided almost to the base into linear 
segments; stem-leaves similar but smaller; cyme dense, often nearly subcapitate; hypan- 
thium cupulate, about 5 mm. in diameter, hirsute; bractlets linear-filiform, much smaller 
than the broadly lanceolate sepals which are about 4 mm. long; petals oblong, very little 
exceeding the sepals, rounded at the apex. 
TYPE LOCALITY: Laguna of Santa Rosa Creek, California, 
DISTRIBUTION: Coast range of California. 
ILLUSTRATION: Mem. Dep. Bot. Columbia Univ. 2: f1. 73. 
IV, Capitatae. In general habit resembling the group Cuneatae, but the inflorescence 
more contracted, fastigiately corymbose-cymose or subcapitate. Hypanthium deeply cup- 
shaped ; bractlets linear. Filaments of the outer stamens much broader than those of the 
inner ones, broadly triangular. Pistils numerous. Petals obcordate, unguiculate, white 
or often tinged with rose. 
19. Horkelia Brownii Rydberg, sp. nov. 
Perennial, with a short caudex; stems several, about 3 dm. high, branched, more or 
less villous with short hairs and glandular; stipules lanceolate, toothed; basal leaves 5-10 
em. long, with 7-9 pairs of leaflets, which are cuneate, 5-12 mm. long, densely short- 
villous and cleft or incised at the end, with lanceolate or oblong teeth ; stem-leaves smaller, 
with 2-3 pairs of narrower leaflets; cyme rather open; hypanthium cupulate, in fruit 3 
mm. high, glandular-villous; bractlets linear, 1 mm., or in fruit 2 mm. long; sepals 
lanceolate, acute, 1.5 mm., in fruit 3 mm. long; petals white, broadly cuneate, about 2 
mm, long; filaments broadly subulate. 
Type collected on the south side of Mt. Shasta, Siskiyou County, California, in 1897, H. EZ. 
Brown 530 (herb. N. Y. Bot. Gard.). 
DISTRIBUTION: Type locality and vicinity. 
20. Horkelia tenella (S. Wats.) Rydb. Bull. Torrey 
Club 25: 55. 1898. 
Horkelia fusca tenella S. Wats. Bot. Calif. 1: 181. 1876. 
Potentilla Douglasit tenella Greene, Fl, Fran. 1: 67. 1891. 
Perennial, witha thick root and short caudex; stems slender, 2-3 dm. high, glandular- 
pruinose ; stipules lanceolate, toothed; basal leaves 5-8 cm. long, with 4-6 pairs of leaflets, 
which are cuneate, 5-15 mm. long, slightly glandular-pruinose and with a few scattered 
