156 MEMOIES FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



ovate, .5 cm. or less, often divided. Basal leaves numerous, 3-10 cm. 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 cm. 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, i. e., 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 Ivesia but the leaflets are less crowded and not imbricated. 



I. Comarella multifoliolata (Torr.). 



Horkelia ? multifoliolata Torr. Bot. Sitgreave's Exp. 159. 1853. 



Potentilla depauperata 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, /. 3; flower seen from above, 

 /. 4 ; stamen, /. 5 ; pistil, /. 6 ; section of achene, /. 7; fruiting hpyanthium and calyx, 

 'f.8. 



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 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, Unear or oblanceolate, acute, shorter than the sepals. 



