156 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 
ovate, .5 cm. or less, often divided. Basal leaves numerous, 3-10 em. long, densely white- 
silky, terete and wormlike from the numerous minute crowded leaflets. Stem leaves 
similar, but smaller. Cyme intricately branched into filiform branches and very slender 
pedicels 1-2 em. long. Hypanthium finely puberulent, saucer-shaped, in fruit 3 mm. 
in diameter; bractlets ovate, minute, about a fourth the length of the ovate sepals. 
Petals white, broadly obovate or orbicular, twice as long as the sepals. 
Rather common in the Sierra Nevada. 
4. COMARELLA. 
Hypanthium wheel-shaped, 7. ¢., the central portion .turbinate, enclosing the 
ovaries and beset on its inner surface with long bristles, the lateral portion, making 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 on the outer margin of the flat portion of the hypanthium ; filaments 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. 
The genus contains two species, natives of Arizona, New Mexico and Utah. The leaves 
somewhat resemble those of /vesia but the leaflets are less crowded and not imbricated. 
1. Comarella multifoliolata (Torr.). 
Horkelia ? multifoliolata Torr. Bot. Sitgreave’s Exp. 159, 1853. 
Potentilla depawperata Engelm ; Gray, Proc. Am. Acad. 7: 399. 1868. 
Greene, Pittonia, 1: 105. 
Ivesia depauperata Gray ; Brewer & Wats. Bot. Cal. 1: 184. 1876. 
ILLustRations: PLATE 96, f. 1-2; dissection of flower, f. 3; flower seen from above, 
f. 4; stamen, f. 5; pistil, f. 6; section of achene, J. 7; fruiting hpyanthium and calyx, 
Stem 3-6 din. 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 approximate pairs, 5-10 mm. 
long, 3-5-cleft, with oblong or ovate segments. Cyme open, flat-topped, with diverging 
branches and slender pedicels. Hypanthium saucer-shaped, puberulent, about 5 mm. 
in diameter, purplish, in fruit 5-angled; bractlets linear-subulate, somewhat fleshy, 
much shorter than the broadly lanceolate acuminate purplish-tinged sepals. Petals 
purple, linear or oblanceolate, acute, shorter than the sepals, 
