A FASCICLE OF SENECIOS. 111 
teeth toward the apex, all with a narrow revolute margin, 
the broad raised midvein and several of its branches very 
prominent beneath: scapiform flowering stems white-floc- 
cose, 3 to 5 inches high, bearing small and few scattered 
bracts: heads in a subcorymbose cluster, some long-pedi- 
celled, others subsessile; involucres hoary-tomentose: rays 
golden-yellow. 
From the Sierra Madre, Chihuahua, Mexico, at 7,500 feet, 
collected by Mr. Townsend, 24 May, 1899. Though much 
like its Rocky Mountain homologue named above, as to 
mode of growth, the foliage is almost exactly that of the 
shrubby S. Palmeri of Guadalupe Island. It is a beautiful 
Species, never in’ the least glabrate in maturity, and the 
leaves of two seasons are evident upon the subligneous and 
rather elongated caudex. 
S. Pursatanus, Nutt. Trans. Am. Phil. Soc. vii. 412 
(1841) S. Laramiensis, A. Nels. Bull. Torr. Club, xxvi, 
483 (1899). More than twenty years since, I knew this 
plant somewhat familiarly, and took it, on faith in authori- 
ties, for S. canus, as Mr. Nelson did until lately; and so, 
when what afterwards came to pass, the real S. canus came 
to my notice, I saw its distinctness from the other and named 
it S. Howellii. When this error of having made a synonym 
for the true S. canus came to be recognized as an error, I at- 
tempted to make out the characters of the Wyoming plant as 
distinct, and should have created a synonym for that, as Prof. 
Nelson has now done, had I not discovered it to be the S. Pursh- 
ianus of Nuttall. Itsrangeisnotso very limited. I have col- 
lected it myself not only near Laramie, but also in several 
places about Cheyenne, as well asin northern and even middle 
Colorado, where it is subalpine or almost alpine. I have a 
suspicion that in its most reduced high-mountain state it 
was actually referred by Asa Gray to his S. wernerizfolius, 
to which species it bears quite as much likeness as to nor- 
mal and typical S. canus, as Prof. Nelson has observed. 
Prrronta, Vol. IV. Pages 111-126. 10 Jan., 1900. 
