126 PITTONIA. 
is easily distinct. It is Parry & Palmer's number 355, from 
San Luis Potosi, Mexico, 1878, as far as specimens under 
that number are known to me. 
C. pENSUS. Stems several from a thick knotted woody 
crown or root, 1 to 2 feet high, leafy and floriferous almost 
from the base: leaves mostly alternate, broadly lanceolate, 
1} inches long, subsessile, lightly serrate or crenate, sub- 
coriaceous, rugose-reticulate, canescent with a rather coarse 
and rough tomentum: heads subcylindric, i inch high or 
more, nearly sessile by twos and threes in the axils of the 
leaves; bracts of the involucre few, the short outer ones 
oblong-lanceolate, the inner oblong-linear, all acute, 5- 
nerved : achenes villous. 
On rocks in the vicinity of Chihuahua, Mexico, C. G. 
Pringle, n. 635; distributed under the manuscript name 
Brickellia oliganthes, var. crebra. 
C. POLYANTHEMUS. Apparently tall, stout and shrubby, 
the mere flowering panicle 2 feet long and more than 1 foot 
broad: lower leaves not seen, those at base of panicle ovate 
and oblong-ovate, 1 to 2 inches long, subcoriaceous, rather 
remotely serrate-toothed, scabrous-pubescent and rugose- 
veiny: branches of the panicle virgate-racemose, the turbi- 
nate involucres 4 inch high or more, on pedicels as long or 
longer, about 20 or 25-flowered, braets many, much imbri- 
cated, from obloug-oval to oblong-linear, all obtuse but cus- 
pidately mucronate, evenly about 7-nerved : achenes very 
villous. 
Rio Blanco, State of Jalisco, Mexico, Edw. Palmer, 1886, 
number 59. 
