CATALOGUE. 147 
It is evident that this plant is near to S. odora, Ait., but it appears to 
differ in its leaves and in the obtuse scales of the involucre, as well as in 
the larger number of flowers (of both kinds) in the head, and in the 
absence of the characteristic odor of odora. I name it in honor of Lieut. 
Wm. L. Marshall, United States Engineers, for whose assistance in my 
work I am under many obligations—Chiricahua Agency, Southern 
Arizona (530). 
Sotipaco Missouriensis, Nutt—Twin Lakes, Colorado (405). 
SoutipaGo CanapeEnsis, L. (var. ?)—This form has been placed here 
by Dr. Gray. It is, however, nearly perfectly smooth, or at most only 
puberulent below and slightly pubescent above; leaves also are barely 
roughish above and glabrous below.—Twin Lakes, Colorado (406). 
APHANOSTEPHUS * RAMOSISSIMUS, DC.—Stems much branched from a 
woody base, nearly glabrous, puberulent, or somewhat hispidly pubescent 
at tip; lower leaves narrowly spatulate or oblanceolate, variously toothed 
or divided at the apex, closely sessile, 1-2’ long, 1-3” wide; upper 
leaves narrower, more entire and pubescent or hispidly pubescent; heads 
3” in diameter; involucre-scales in two series, oblong, rather acute and 
pubescent, the apices and margins distinctly scarious; rays 2-4” long, 
narrow, at first a little pinkish and afterward yellowish or white; disk- 
flowers yellow, hardly longer than the scales of the involucre (in my 
specimens, there is no evident thickening of the tube of the disk-flowers); 
pappus coroniform, of very short bristles; achenia obscurely angled, many- 
ribbed (most distinctly so on the inner side), and with a few rather long 
hairs—My specimens (336) from the Gila River, in Arizona (2,800 feet 
altitude), show considerable range of variation in shape of leaves, acuteness 
of involucral scales, and degree of pubescence. 
* APHANOSTEPHUS, DC.—Heads heterogamous, radiate; ray-flowers fertile; disk-flowers ‘bas 
Involucre hemispherical, the linear or lanceolate bracts imbricated in a few series, their apices and 
margins scarious [slightly], exterior ones somewhat shorter. Receptacle convex. Baye » arrow, spread- 
ing and entire; disk-flowers tubular, the limb elongated, slightly enlarged, 5-toothed. Anthers entire 
and obtuse at the base. Branches of the style in the perfect flowers compressed, terminated by very 
short, obtuse appendages. Achenia subterete or obtusely 4-5-angled, many-ribbed. Pappus coroniform 
dentate, sometimes short.—Much branched, erect or ascending, canescently puberulent herbs. Heads 
solitary on the dilated apices of the branches. Rays white; disk yellow. Achenia smooth.—BENTHAM 
HOOKER. 
