434 DESCRIPTIONS OF NEW SPECIES 



trice minute, not a oalosity. Pappus white and shining, coarse and rather 

 bristly, scarcely in the least scabrous, thicker at the base, longer than the 

 achenium. 



Hab. With the above, to the Rocky Mountains. 



Troximon *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. 



Hab. 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 T. glaucum, but with the habit and leaves of T. aurantiacum ; the invohicrum 

 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. 



Hab. Plains of the 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. 

 i . 



1 1 Achenium compressed, with ten shallow, acute ribs, and attenuated into a dis- 

 tinct rostrum, shorter than the long and hristhj pappus. Involucrum ovate, in 

 about three series of unequal, lanceolate sepals. 



Troximon * parviftorum; 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. 



Hab. 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. 



