A FASCICLE OF SENECIOS. 119 
S. AMPLECTENS, Gray, Sillim. Journ., ser. 2, xxxiii., 240 ; 
but in part only of Syn. Fl. 384. At least four species are 
confused with this in the Synoptical Flora; but one con- 
versant with Rocky Mountain. botany will find no difficulty 
in determining which one of these is the original S. am- 
plectens ; for at the time when this was published Dr. Gray 
knew none of the others, hence his diagnosis is clear. The 
associations of the plant have not, I believe, hitherto been 
mentioned. It occurs only in open woods, or along their 
borders, well below timber-line, while all those here sep- 
arated froin it are alpine, even almost high-alpine, occurring 
only far above the limit of trees. S. amplectens is always 
tall; its large long-rayed heads are very abruptly-nodding, 
their involueres almost black with a dark pubescence, of 
which no trace is ever found on any of its allies; the ex- 
cessively long rays are 5-nerved. As to the subterranean 
parts, its rootstock is quite horizontal, superficially seated, 
and from this the stem arises very decumbently. 
S. TARAXACOIDES. S. amplectens var. taraxacoides, Gray, 
Proc. Philad. Acad. 1868, p. 67, but in small part only. 
Dwarf, the very leafy and usually monocephalous stem only 
2 or 3 inches high, very erect from an erect rather stout and 
fleshy rootstock, this short-jointed and bearing copious white 
rather soft and fleshy elongated roots: whole herbage, the 
involucre excepted, permanently arachnoid-tomentulose: 
leaves 1} to 2 inches long, variously simulating those of a 
Taraxacum in outline and dentation, though the mostly tri- 
angular teeth are seldom runcinate, the whole leaf margin 
commonly revolute: head only horizontally nodding: in- 
volucre dark-green, glabrous except a few white arachnoid 
hairs: rays 4 inch long, light-yellow, 4-nerved. 
r. Gray’s var. taraxacoides was based on two very differ- 
ent plants, the other being wholly glabrous, and much more 
nearly related to S. Soldanella than to S. amplectens. I choose 
the present one as type of my species taraxacoides for the 
