22 ERYTHEA. 
Crevices of perpendicular rocks, in shaded cafions of the 
West Humboldt Mountains, Nevada, collected by the author, 
in July, 1894. 
Pyrrocoma subsquarrosa. Stems several from a thick 
somewhat fusiform root, more or less decumbent, 5 to 9 
inches high, bearing at summit 3 or 4 racemosely disposed 
heads or a single terminal one; herbage, especially the stem 
and lower face of leaves, canescently tomentulose: leaves 
lanceolate, petiolate, from nearly equalling to quite surpass- 
ing the stem and inflorescence, very conspicuously spinulose- 
serrate: heads 1 inch high, rather narrowly campanulate; 
outer bracts of the involucre linear-lanceolate, saliently 
spinose-serrate; inner ones spatulate-dilated above the 
middle and this part with subcartilaginous or subscarious 
margin, the apex an herbaceous recurved cusp: achenes 
lanceolate, distinctly tapering at each end, and of a glossy 
light-green hue. 
Plant like P. Cusickii in some respects, but approaching 
the Homopappus section in others. The subsquarrose in- 
volucre is a new character in true Pyrrocoma. The speci- 
mens are from Wyoming, collected by Mr. J. N. Rose, 1893. 
Senecio lynceus. Related to S. Fendleri, but plants 
solitary (S. Fendleri being clustered or matted), 1 to 14 feet 
high, very leafy at base, the stem branching from near the 
base, all the branches flowering: herbage loosely and flocu- 
lently white-tomentose, often glabrate in age: all except the 
lowest radical leaves (these often quite lyrate) bipinnately 
parted into many small acute lobes, the texture thickish but 
rather fleshy (not coriaceous as in S. Fendlert): stem and 
branches bracted, not leafy, ending in an unequal-rayed 
cymose corymb of small broadish radiate heads. 
Common on dry bushy hills of northern Arizona and adja- 
cent Utah and Nevada. Usually referred to S. Fendleri but 
very distinct. Rusby’s specimens, from Lynx Creek, Arizona, 
well represent the species, though it is a variable one. 
