178 BOTANY. 



3-parted or pinnate, with the divisions all linear; inflorescence cymose- 

 paniculate; pedicels few, bracteolate below; involucre scales with two thick 

 nerves; loosely calyculate beneath the head. A most variable species, 

 already noted by Dr. Gray as being with S. spartioides and others inextri- 

 cably confused. — New Mexico, where it is one of the commonest plants 

 of the dry hill-sides. 



Senecio spartioides, T. & G — Smooth, suffruticose, much branching; 

 leaves 2-3' long and a line wide, entire or very sparingly toothed; heads 

 corymbose, or corymbose-paniculate; peduncles short, minutely bracteolate, 

 calyculate scales subulate or narrowly lanceolate; involucre cylindrical, 

 scales thin, nerves delicate; achenia silky-caneseent, — Valley of the Upper 

 Arkansas, Colorado (589). 



Senecio ekemophilus, Richards. — San Luis Valley, Colorado, a 

 narrow-leaved form (561, 562) ; also New Mexico. 



Senecio Fremontii, T. & G. — Colorado ; among the mountains at 

 11,500 feet and upward (571, 572, 576); contracted above, smooth, striate. 

 Mountains of Colorado, at 12,000 to 13,000 feet altitude (573, 575). 



Senecio Bigelovii, Gray. — Erect, smooth, branching toward the top; 

 lower leaves 5-8' long, less than an inch wide, irregularly sinuate or 

 dentate, the tips of the teeth callous, somewhat falcate, tapering toward 

 the base into a margined petiole; upper leaves sessile and more reduced; 

 heads large, homogamous, nodding, calyculate scales subulate, involucral 

 scales in two series, lanceolate, the inner ones more decidedly scarious- 

 margined than the outer. Achenia oblong, distinctly ribbed, and in some 

 cases under the lens faintly glandular ; root a cluster of fleshy fibres. — 

 Mount Graham, at and above 9,000 feet (762); also from the Sierra Blanca, 

 Arizona; also var. monocephalus (Gray?), Twin Lakes, Colorado (587, 674). 



Senecio Fendleri, Gray (PI. Fendl. p. 108). — Twin Lakes, Colorado 

 (557). 



Senecio Soldanella, Gray (Proc. Acad. Nat. Sci. Phila. March, 

 1863, p. 76). — Dwarf, sub-caulescent; root fibrous and fasciculate, glabrous 

 and usually glaucous, monocephalous; lower leaves orbicular, 1^-2' in 

 diameter, purplish beneath, on petioles 6' long, which are widely scarious- 

 margined; upper leaves smaller and on shorter petioles, the highest one 



