A FASCICLE OF SENECIOS. 117 
12-flowered, bracts about 8, linear, with acute blackish tips, 
otherwise green: rays 3 or 4: achenes small, glabrous. 
Stony dry river betls about Pagosa Springs, Colorado, 27 
July, 1899, C. F. Baker. A fine large species, remarkable 
for the great number of small cylindric heads; the species 
intermediate, in a way, between S. atratus of the middle 
Rocky Mountains and S. umbraculifer of Chihuahua, north- 
ern Mexico. 
S.IMBRICATUS. Allied to the last, but stems perhaps soli- 
tary, 2 to 5 inches high, bearing few and somewhat ample 
leaves and a terminal corymb of few heads: lowest leaves 
lanceolate, acute, mucronately dentate or denticulate, taper- 
ing to a short usually somewhat winged petiole; cauline 
not much reduced in size and similar in outline, dentation, 
etc., but broad at base and amplexicaul, both faces of all, as 
well as the stem, hoary-tomentulose: involucres rather 
broad and short, with broad lanceolate conspicuously black- 
tipped bracts and several unequal but uncommonly large 
equally black-tipped calyculate bractlets at base: aye 8 or 
10, elongated, light-yellow. 
Collected at the Reindeer Station, Port Clarence, Akn 
9 Sept., 1894, by Mr. James T. White, the specimens de- 
posited in the U.S. Herbarium. Species remarkable for the 
large size of the calyculate bractlets, these giving the invo- 
lucre as a whole the appearance of being somewhat imbri- 
cate. 
S. scoPULINUs. S. Bigelovii, var. Hallii, Gray, Proc. 
Philad. Acad. 1863, p.67. S. Bigelovii var. monocephalus, 
Rothr. Wheeler Rep. 178. This plant, common in the 
mountains of middle and southern Colorado, is thoroughly 
distinct from S: Bigelovii by its peculiar pubescence of many- 
jointed and crisped hairs. True S. Bigelovii is still unknown 
except from southern New Mexico, and is of very different 
aspect, with thin and not at all succulent deep-green herb- 
