118 PITTONIA. 
age, usually no trace of any pubescence, but this consisting 
of short stiff straight hairs whenever present. This, the 
real S. Bigelovii, was distributed by Mr. Wooton, from the 
White Mountains of New Mexico, as S. Rusbyi, an error for 
which I am solely responsible. The species is nearer to 
S. Rusbyi than it is to S. scopulinus, which latter I have 
until recently assumed to be typical S. Bigelovit. 
S. CHLORANTHUS. Allied to the preceding and to S. Bige- 
lovii, taller than either, commonly a yard high or more, 
leafy throughout, deep-green and glabrous, or occasionally 
with a scanty indument of many-jointed deflexed hairs on 
the peduncles and about the insertion of the upper leaves: 
lowest leaves narrow-lanceolate tapering to a winged petiole 
which is at base dilated and almost sheathing the stem, the 
whole 6 to 10 inches long; the middle cauline spatulate- 
lanceolate and, like the broad-based ovate-lanceolate upper- 
most, sessile; all very acute or acuminate, evenly and 
sharply denticulate: large and long-peduncled. nodding 
heads often as many as ten and forming a strict raceme, 
sometimes one or two only: involucres and greenish flowers 
much as in S. Rusbyi or S. Bigelovii. 
Mountains of southern Colorado, near Pagosa Peak, at 
9,500 feet, 15 Aug., 1899, collected by C. F. Baker. I should 
have referred this, though with doubt, to S. Rusby?, had I 
not detected the characteristic pubescence in some of the 
specimens. ©. Rusbyi, quite different from this in inflores- 
cence, the raceme being long, strict and almost naked, has 
also traces of a pubescence, but the hairs are so short and 
stiff as to be scaberulous. 
S. PUDICUS. S. cernuus, Gray, not of Linn. f., is another 
member of this group of Rocky Mountain species with 
nodding heads; but the name at first assigned by Dr. 
Gray, being a fiction yu, is to be avoided. 
i 
