Part 3, 1908] ROSACEAB 291 
fewer leaflets; inflorescence rather open, cymose, usually with recurved pedicels in fruit ; 
hypanthium 34 mm. broad, glandular-puberulent, saucer-shaped, in fruit 5-angled ; bract- 
lets linear to elliptic, about two-thirds as long as the triangular-ovate sepals, which are about 
3 mm. long; petals spatulate, about equaling the sepals; statnens 5, with short filaments, 
inclined towards the few pistils. ~ 
TYPE LOCALITY : Fremont’s Pass, East Humboldt Mountains, Nevada. 
DISTRIBUTION : Nevada. 
ILLUSTRATION: Mem. Dep. Bot. Columbia Univ. 2: pl. 94, f. 7. 
17. PURPUSIA Brand. Bot. Gaz. 27: 446. 1899. 
Cespitose glandular perennials, with thick roots and short caudices. Leaves odd-pin- 
nate, mostly basal. Inflorescence racemosely or corymbosely cymose. Hypanthium deeply 
campanulate. Bractlets none. Sepals 5, valvate. Petals 5, white, oblanceolate, acuminate. 
Stamens 5, opposite the sepals, inserted at the mouth of the hypanthium ; filaments filiform ; 
anthers didymous. Pistils 6-7, on a stalked receptacle; styles nearly terminal, filiform, 
articulate at the base. Embryo curved ; radicle superior. , 
Type species, Purpusia saxosa Brand. 
1. Purpusia saxosa Brand. Bot. Gaz. 27: 447. 1899, 
Stems 1-1.5 dm. high, hirsute and viscid ; basal leaves numerous, odd-pinnate; leaflets 
2-3 pairs, broadly obovate, cuneate or suborbicular, 1-1.5 cm. long, more or less deeply 
cleft into 5-10 rounded or oblong teeth, densely glandular-pilose; the terminal one often 
3-divided ; stem-leaves smaller and becoming bract-like above; stipules ovate, acuminate, 
about 7 mm. long, entire or incised; pedicels 1-2 cm. long; hypanthium 3 mm. long, 
indistinctly 10-ribbed ; sepals 4 mm. long, lanceolate or ovate-lanceolate, acuminate; petals 
white, 4 mm. long, 1 mm. wide, slightly acuminate; receptacle cylindric, 2 mm. long, 
bearing the pistils on the hirsute summit; styles filiform; achenes smooth. 
TYPE LOCALITY: Sheep Mountains, Nevada. 
DISTRIBUTION : Known only from the type locality. 
18. COMARELLA Rydb. Mem. Dep. Bot. Columbia 
Univ. 2: 156. 1898. 
Perennial herbs, with very thick woody taproots and short, thick, scaly caudices. 
Leaves pinnate with numerous crowded leaflets. Inflorescence cymose-paniculate with 
slender branches. Hypanthium wheel-shaped, 7. ¢., the central portion turbinate, enclos- 
ing the ovaries and beset on its inner surface with long bristles, the peripheral portion, mak- 
ing an obtuse angle with the former, flat, pentagonal in outline, making nearly a right angle 
with the pedicel. Petals dark-purple, narrowly linear, shorter than the calyx. Stamens 
5, inserted at the outer margin of the flat portion of the hypanthium ; filiments filiform, 
bent inward ; anthers small, opening by a longitudinal slit. Pistils two; styles long and 
filiform, terminal. Mature achenes assuming a nearly horizontal position, rather flat. 
Seed inserted near the base of the style, pendulous, anatropous. 
Type species, Horkelia multifoliolata Torr. 
Plant puberulent; leaflets 40-60, 5-10 mm. long. 1. C. multifoliolata, 
Plant glabrous; leaflets about 30, 3-5 mm. long. 2. C. sabulosa. 
1. Comarella multifoliolata (Torr.) Rydb. Mem. Dep. Bot. Columbia 
Univ. 2: 156. 1898. 
Horkelia? multifoliolata Torr. in Sitgreaves, Rep. Exp. 159. 1853. 
Potentilla depauperaia Engelm.; A. Gtay, Proc. Am. Acad. 7: 399. 1868. 
lvesia depauperata A. Gray ; Brewer & Wats. Bot. Calif. 1: 184. 1876. 
Perennial, with a thick root and short caudex; stem 3-6 dm. high, ascending or erect, 
finely pubescent, in age glabrate, somewhat leafy; stipules lanceolate, often cleft; leaves 
1-3 dm. long, finely pubescent when young, in age glabrate, pinnate ; leaflets 20-30 rather 
