290 NORTH AMERICAN FLORA [VoLuME 22 
minute leaflets, which are 2-3 mm. long, crowded, cleft to the base into several obovate 
thick segments mostly tipped with bristles; inflorescence open, strictly cymose and with 
diverging branches; hypanthium about 3 mm. in diameter, saucer-shaped, densely glandu- 
lar and in age decidedly 5-angled with a prominent disk; bractlets ovate, about half the 
length of the broadly ovate sepals; petals spatulate, white (?), about equaling the sepals; 
stamens 5. 
TYPE LOCALITY : Summit of Silver Peak, Alpine County, California. 
DISTRIBUTION : Sierra Nevada, California. 
ILLUSTRATION : Mem. Dep. Bot. Columbia Univ. 2: pl. 97, f. 8-4. 
22. Ivesia chaetophora Rydberg. 
Horkelia chaetophora Rydb. Bull. Torrey Club 26: 543. 1899. 
Perennial, with astrong root, and a stout caudex, covered with the remains of leaf-stalks 
and stipules from former years; stems several, 1-1.5 dm. high, almost scapose, finely puberu- 
lent; basal leaves numerous, about 1 dm. long, with 15-20 pairs of leaflets; their stipules 
broad, brown, obtuse, bristly ciliate; leaflets 3-5 mm. long, divided to near the base into 
linear-oblong segments, densely puberulent and tipped with bristles; cyme rather many- 
flowered and open; hypanthium 5-7 mm. in diameter, puberulent and hirsute; bractlets 
linear-oblong, one-third shorter than the broadly lanceolate-acute sepals; petals yellow, 
oblong, about equaling the sepals; stamens 10; filaments filiform; pistils about 20. 
TYPE LOCALITY: Farwell Gap, Tulare County, California. 
DISTRIBUTION: Southern Sierra Nevada. 
IV. Setosae. Stems several from the caudex, rather leafy, with open rather few- 
flowered cymes. MHypanthium saucer-shaped. Petals obovate or oblanceolate, clawed. 
Stamens 5-30. Leaves with comparatively few leaflets, which are broadly obovate to 
reniform-flabelliform, coarsely toothed or incised. 
23. Ivesia Baileyi S. Wats. Bot. King’s Expl. 90. 1871. 
Potentilia Baileyi Greene, Pittonia 1: 105. 1887. 
Hlorkelia Batleyi Rydb. Mem. Dep. Bot. Columbia Univ. 2: 154. 1898. 
Perennial, with a taproot and cespitose caudex ; stems several, decumbent or ascending, 
1-3 dm. long, finely pubescent or glabrate, somewhat leafy; stipules obovate, entire, about 
5 mm. long; basal leaves many, 1-2 dm. long, pinnate; leaflets 4-6 rather distant pairs, 
finely pubescent or glabrate, 5-10 mm. long, thin, obovate or orbicular, generally oblique, 
deeply incised into rounded-obovate segments; stem-leaves smaller, with 2-3 pairs of leaflets ; 
inflorescence rather open and truly cymose, with slender pedicels; hypanthium 4-5 mm. 
broad, slightly glandular-villous, saucer-shaped, in fruit evidently 5-angled with a disk; 
bractlets linear-oblong, one-third to two-thirds the length of the broadly ovate sepals, which 
are 2mm. long; petals yellow, spatulate, shorter than the sepals; stamens 5, with short fila- 
ments, which incline toward the 4 to 8 pistils. ~ 
TYPE LOCALITY: Wright’s Cafion, West Humboldt Mountains, Nevada. 
DisTRIBUTION : Interior of Oregon and Nevada. 
ILLUSTRATION : Mem. Dep. Bot. Columbia Univ. 2: pl. 94, f. 1-46. 
24. Ivesia setosa (S. Wats.) Rydberg. 
lvesia Batleyi setosa S, Wats. Bot. King’s Expl. 91. 1871. 
Horkelia Baileyt setosa Rydb. Mem. Dep. Bot. Columbia Univ. 2: 154. 1898. 
Perennial, with a-thick taproot and short cespitose caudex; stems several, ascending, 
erect or decumbent at the base, 1-1.5 dm. high, glandular-puberulent, few-leaved ; stipules 
of the basal leaves subulate, of the stem-leaves ovate, more or less toothed; basal leaves 
numerous, 1-1.5 em. long, pinnate, with 7-10 pairs of leaflets, which are cuneate or flabelli- 
form, 5-8 mm. long, rather thick, glandular-puberulent, divided to near the base into ob- 
long or oblanceolate divisions, usually terminated by bristles; stem-leaves similar but with 
