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434 - DESCRIPTIONS OF NEW SPECIES 
trice minute, not a calosity. Pappus white and shining, coarse and rather 
_ bristly, scarcely in the least scabrous, thicker at the base, longer than the 
achenium. 
Has. With the above, to the Rocky Mountains. 
Trozimon * pumilum; leaves lanceolate or oblong-lanceolate, scarcely acute; 
scape but little longer than the leaves; involucrum campanulate; sepals nume- 
rous, in three or four nearly equal series, ovate-lanceolate, acute, pubescent, the 
inner linear, all divided to the base. _ 
Has. Plains of the Rocky Mountains, in Oregon. The only specimen I have seen is about 
four and a half inches high, the scape about an inch longer than the almost obtuse, smooth, and 
glaucous leaves. ‘The sepals are unusually numerous, and nearly all of a length, the outer a little 
shorter. Allied to 7. glaucum, but with the habit and leaves of 7’. aurantiacum ; the involucrum 
wholly different from either. 
Troximon * taraxacifolium; subhirsute; leaves lanceolate or oval-lanceolate 
scarcely acute, incisely and runcinately dentate at base; involucrum of about 
two series of leaflets, the inner linear; achenium rostrately attenuated, the ribs 
shallow and slender. : 
Has. Plains ofthe Wahlamet. But I have only seen it after flowering. A very distinct species, 
from the broadness of the leaves, which are one and a quarter inches wide, by about six inches 
long, attenuated at base, and most pubescent on the mid-rib. Scape rather short. Pappus very 
long and coarse, minutely scabrous. 
t + Achenium compressed, nith ten shallow, acute ribs, and attenuated into a dis- 
tinct rostrum, shorter than the long and bristly pappus. Involucrum ovate, in 
about three series of unequal, lanceolate sepals. 
Troximon * parviflorum; leaves linear-lanceolate, acuminate, smooth or pu- 
bescent, often runcinately denticulate towards the base; scape pubescent at 
the summit, lanuginous; sepals nearly smooth, in three unequal series, lanceo- 
late, acuminate; flowers yellow. 
Has. On the plains of the Platte to the Rocky Mountains. About four or five inches high. 
The leaves about two lines wide, acuminated at each end. Pappus minutely scabrous; the outer- 
most divisions of the involucrum only about half the length of the inner. 
Troximon * roseum; leaves narrow lanceolate, runcinately pinnatifid, acumi- 
nate, the segments or teeth linear and acuminate; scape elongated, smooth, ex- 
cept the summit, which is lanuginous; sepals in about three unequal series, | 
lanceolate, acuminate; flowers rose-colour. 
