230 PITTONIA. 
(the very inmost set) ovate at base by virtue of a broad 
scarious margin, this usually concealed by the alternating 
exterior narrower and marginless bract: achenes muricate 
at summit, tuberculate along the ribs, the beak or stipe of 
the pappus short, of less than twice the length of the 
achene. 
On Sheep Mountain, Waterton Lake, Alberta, July, 1895, 
collected by Mr. John Macoun, n. 11,711. Very distinct 
from all other alpine species, and approaching European 
types in the shortness of the stipe of the pappus. 
V T. AcERUM. Rather slender, the scapes erect, 4 to 6 
inches high at flowering, and even then notably surpassing 
the foliage; scapes flocculent, all other parts glabrous: leaves 
2 to 4 inches long, consisting of a linear rachis-like body 
and a few pairs of divaricate or retrorse subulate-linear or 
faleate lobes; outer bracts of involucre biserial, lanceolate, 
with dilated tips, erect, the longest three-fourths as long 
as the inner, these also dilated and corniculate: achenes 
sharply spinulose at the very apex, the sides smooth, striate 
or ribbed; stipe of pappus only twice the length of the 
achene. 
Cañon of the Upper Liard, in lat. 60°, north of British 
Columbia, collected by Mr. Dawson, 26 June, 1887, and 
numbered 15,119 in the Geol. Surv. Herb. This is all the 
material seen by me of what is a new species of very 
peculiar aspect, and pronounced characters of leaf and 
involucre. 
Y T. DUMETORUM. Large, the crown of the root, or each of its 
several branches, bearing mostly one stout erect scape a foot 
high or more, and several upright leaves, some more than a 
foot long; herbage glabrous, except some traces of arachnoid. 
hairiness along the midvein beneath in young and growing 
