A FASCICLE OF SENECIOS. 113 
The young and simple states of this I have found, and so 
have others, in abundance at the northern limits of the 
species, often with foliage almost totally unlike what is seen 
in the old and perfect state; and the old, mature and widely 
multicipitous state is just as common in New Mexico and 
southern Colorado; though the plant of the South, in what- 
soever stage of development, is more than twice as large as 
that of the cold and dry hills and plains of Wyoming, 
where all southern species, if they reach that range, are 
starved and stunted. 
S. MUTABILIS. Resembling S. Fendleri, but stouter and of 
more herbaceous texture, the branches of the caudex stout, 
in no degree subligneous, erect or ascending, the mature 
plant thus forming a small and dense tuft rather than a 
broad loose mat: pubescence extremely varied, some plants 
with foliage glabrous above but more or less tomentose be- 
neath, some equally and hoarily tomentose as to both faces, 
but the tomentum always more loose and flocculent and far 
more apt to be deciduous than in S. Fendleri: leaves as to 
outline varying from obovate-spatulate to broadly or nar- 
rowly oblanceolate, the margin from almost or quite entire 
to tridentate at the apex, evenly serrate-toothed throughout, 
or sinuately or pectinately or even somewhat lyrately pin- 
natifid; even the reduced cauline ones from oblanceolate 
and entire to linear and pectinate-pinnatifid: heads usually 
rather fewer and larger than in S. Fendleri, the involucres 
glabrous: oblong 4-nerved rays more deeply tridentate, 
varying from light-yellow to nearly orange-color. 
In dry lowlands about Arboles and Los Pinos, southern 
Colorado, collected in May and June, 1899, by C. F. Baker. 
A species difficult to diagnose, on account of the extreme 
variability of its foliage and the degree of pubescence; but 
as a whole indubitably distinct from S. Fendleri by its 
fleshiness and compact habit. It is, indeed, quite analogous 
to the S. compactus of the plains of northern Colorado, and 
perhaps allied to it as closely as to S. Fendleri. 
