STUDIES IN THE COMPOSITAE. 271 
* Perennials, or at least biennial. 
1. P. Rıcmarpsoni, Hook. FI. i. 317, t. 108 (1833). Acti- 
nella Richardsonii, Nutt. Trans. Am. Phil. Soc. vii. 379 (1841). 
The type is from the plains of British America, but the 
species seems to extend well southward in the Rocky Moun- 
tains, in the Cascades, and even to high plains of the Great 
asin. 
2. P. PUMILA. Perennial, somewhat cæspitose, the deep 
tap-root surmounted by a multicipitous caudex: lowest 
leaves linear, entire, the more strictly cauline parted iuto 3 
to 5 linear segments: stems only 3 or 4 inches high, decum- 
bent at base, mostly monocephalous: involucre as in the 
preceding, and flowers similar but pale-yellow: achenes 
densely white-silky ; pale: of the pappus ovate-lanceolate, 
acuminate but not aristate or mucronate. 
On dry clayey hills of Rock Creek, western Wyoming, 10 
July, 1896. 
9. P. cANESCENsS. Actinella Richardsonii, var. canescens, 
Eaton in Bot. King Exp. 175 (1871). Small and slender 
Perennial with branching caudex, wholly whitish with a . 
soft tomentum: leaves on slender petioles, these with 3 to 
9-nerved dilated base; the blade consisting of 3 palmately 
inserted linear leaflets: involucre campanulate, its broad 
Outer bracts 3-nerved at base: pales of the pappus ovate, 
acuminate but scarcely awn-tipped. 
East Humboldt Mountains, Nevada; collected only by 
Sereno Watson. 
4. P. Rusavr. Actinella Rusbyi, Gray, Proc. Am. Acad. 
xix. 33 (1883) A large green and glabrous corymbose- 
panicled species known only from the Mogollon Mountains, 
ew Mexico. 
5. P. Vasgvr. Actinella Vaseyi, Gray, Proc. Am. Acad. xvii. 
219 (1882). Known only from the Organ Mountains, New - 
Mexico. 
