108 PITTONIA. 
A FASCICLE or SENECIOs. 
S.scALARIS. Stemsapparently single from the perennial 
root, rather slender, 1 to 2 feet high and erect; the growing 
leaves and also the bracts of the inflorescence showing some 
flocculent tomentum, but the plant otherwise glabrous: 
leaves of the basal tuft oval in outline, i to 2 inch long, 
dentate or subpinnatifid, slightly succulent, very erect on 
stout petioles an inch long; cauline leaves longer, of linear 
or narrow-lanceolate outline, sessile and pinnatifid, very 
erect, almost appressed to the stem: heads 4 to 10, short- 
pedicellate and forming a densely subcorymbose cluster : 
bracts of the broad and short involucre about 12, broadly 
lanceolate, acute, glabrous and of a vivid green: rays con- 
spicuous, orange-color. 
Collected in the Sierra Madre, Chihuahua, Mexico, at 
7,500 feet altitude, 13 July, 1899, by Mr. Townsend; com- 
municated by Prof. E. O. Wooton. A member of the same 
group with S. aureus, but distinctly unlike any of the many 
Rocky Mountain allies of that species. My specimens are 
imperfect as to the subterranean parts, and the individual 
stem with its tuft of basal leaves may possibly be one of a 
connected bunch from a branching crown or caudex, but I 
see no indication of such mode of growth. 
S. FLAVULUS. About a foot high, erect and slender, from 
a short and nearly upright rootstock, leafy toward the base, 
glabrous or nearly so except the margins of the petioles, 
which are densely arachnoid-tomentose: leaves small, varia- 
ble, the lowest very small, suborbicular, crenate, those next 
succeeding ovate or cordate-ovate, acute, evenly but more 
incisely cut, these in turn passing to more elongated sub- 
sessile or sessile ones, which are bicrenate or somewhat 
pinnatifid, those next the eymose umbel sessile and bract- 
like: heads 2 to 6 or 7, on slender unequal pedicels, sub- 
