A FASCICLE OF SENECIOS. 121 
S. SERIDOPHYLLUS. Near S. amplectens, similarly thin- 
leaved, but never in any degree floccose, glabrous through- 
oui except a minute and sparse pubescence of hirtellous 
hairs at base of involucre and along the margins of the 
leaves, or even this wanting and the plant wholly glabrous: 
stems slender, 5 to 10 inches high, leafy, bearing at sum- 
mit 1 to 3 slender-peduncled large slightly nodding heads: 
leaves oblong-lanceolate, 3 to 5 inches long including the 
short petiole, variously toothed or denticulate, sometimes 
coarsely laciniate-toothed, occasionally almost entire: heads 
about $ inch high: rays light-yellow, 4 inch long, 3 to 5- 
nerved. 
This is one of Dr. Gray's later additions to that aggregate of 
his which was named S. amplectens, var. tarazacoides; thou gh 
it is really less unlike the original S. amplectens, and far 
enough removed from that. It is Mr. Watson's n. 679, from 
the Clover Mountains, Nevada, at least as represented in the 
U. S. Herbarium, where also I find it in specimens collected 
by Mr. Jones at Marysvale, Utah, at 11,700 feet, it being his 
numbers 5929 and 5958. The above description, however, 
is drawn from my own collecting in 1896, on the Ruby 
Mountains, Nevada; and these specimens exhibit more dis- 
tinetly than others a characteristic short hard rootstock, 
with an investiture of chaffy leaf-bases which persist from 
the foliage of other years. Those of S. soldanella, taraz- 
acoides, Holmii and the rest are always elongated, fleshy and 
naked. This more westerly plant is strictly alpine, though 
with the thin foliage of the subalpine S. amplectens. 
S. LAeTUCINUS, Near the last, but the tufted stems usually 
a foot high or more and leafy throughout, the basal leaves 
smaller and on greatly elongated petioles; branches of the 
rhizome or caudex ascending, hard in texture and more or 
less fibrous-coated by remains of the petioles of a former 
season, the fibrous roots few, much more wiry: herbage 
glabrous: radical leaves from obovate to elliptic-oval, very 
