TARAXACUM IN NORTH AMERICA. 281 
foliage: leaves oblanceolate, often very broadly so, acutish, 
the margin not deeply but very unevenly and laciniately 
cut, the teeth spreading, seldom at all runcinate: scape 
under the involucre arachnoid-tomentose: outer bracts in 
about three series, very large, pale and thin, before the 
flowering almost equalling the inner and nearly concealing 
them, under the mature fruit relatively shorter, oblong, 
lanceolate, narrowed toward the summit, then again dilated 
into an ovate tip; inner braets narrowly linear-lanceolate, 
with a dilated and bifid tip: achenes distinctly compressed, 
olive-green, spinulose at summit, otherwise smooth, or the 
two prominent angles and intervening ribs variously tuber- 
culate or somewhat muricate; beak thrice the length of the 
achene. 
Common in the northern Rocky Mountain districts from 
Wyoming to British America, either in open thickets or 
by streams along their borders, or sometimes in open but 
moist meadow lands. 
'The most typical specimens are those of my own collecting 
along Dale Creek, Wyoming, July, 1896. Essentially the 
same, though much larger plants, are two sheets in the 
Canadian Survey, both collected by Mr. John Macoun, 
namely, n. 12,737, from Moose Jaw, Assiniboia, and n. 5,087, 
from the Cypress Hills, N. W. T. I should also refer here 
Rydberg & Bessey's n. 5,295 (as it is in my set), from the 
Bridger Mts, Montana, distributed for T. latilobum, DC., 
though it is not at all typical, its leaves being too deeply and 
evenly lobed, its scapes not erect, its outer involucral bracts 
too small, and its inner ones less distinctly cornieulate. But 
a plant from Highwood Mts., Montana, by R. S. Williams 
(n. 434 of my set) is again quite typical T. dumetorum, though 
in his Flora of Montana Mr. Rydberg has catalogued it as 
T. ceratophorum. But judging from the original and very 
