027 Rydberg : Studies on the Rocky Mountain Flora 



rowly linear-oblanceolate, with strong midrib, 2-4 cm. long, 2-4 

 mm. wide, entire-margined, acute, finely villous on both sides : 

 heads on naked peduncles, which are 3-4 cm. long : disk about 

 I cm. high and 12-15 mm. broad : bracts in about 2 series, broadly 

 lanceolate, contracted into a long slender tip : rays about i cm. 

 long and 1.5 mm. wide : achenes pubescent: pappus tawny. 



In habit this species resembles most P. inuloidcs, but differs in 

 the smaller leaves, the shorter pubescence and the acumination of 

 the bracts. 



Wyoming: Fort Bridger, 1873, Dr. J. V. Carta- {type in Co- 

 lumbia Herbarium). 



14. Pyrrocoma inuloides (Hook.) Greene, Erythea, 2 : 60. 1894 

 D)uia inuloidcs Hook. Fl. Bor. Am. 2: 25. 1834. 

 Aplopappus inuloides Torr. & Gray, Fl. N. Am. 2 : 241. 1842. 

 Dr. Gray included this in A. uuiflorus, but I agree with Pro- 

 fessor Greene that it ought to be kept distinct. It ranges from 

 Montana to Idaho and Wyoming. 



15. Pyrrocoma uniflora (Hook.) Greene, Erythea, 2 : 60. 1894 

 Donia uniflora Hook. Fl. Bor. Am. 2: 25. 1834. 

 Aplopappus uniflorus Torr. & Gray, Fl. N. Am. 2: 241. 



1842. 



This species grows in alkaline meadows, up to an altitude of 

 2500 m., and ranges from Saskatchewan and Montana to Utah 

 and Colorado. 



16. Pyrrocoma hirta (A. Gray) Greene, Erythea, 2: 69. 1894 

 Aplopappus hirtus A. Gray, Syn. Fl. 2^: 127. 1884. 



The range of this species includes eastern Oregon, Washington 

 and western Idaho, where it reaches an altitude of looo m. 



BALSAMORRHIZA Hook. 



Leaves entire or bluntly toothed, never pinnatifid. 

 Plant white-tomentose. 



Leaves with entire margins or slightly undulate, oblong-cordate to hastate. 



I. B. sagiUaia. 

 Leaves more or less distinctly toothed, ovate-lanceolate, with subcordate 

 base. 2. B. tomentosa. 



Plant hirsute puberulent ; basal leaves cordate. 



Rays linear, deciduous ; achenes glabrous. 3. B. dcltoidea. 



Rays oval, becoming papery, and more or less persistent : achenes puberulent. 



4. B. Cai-eyana. 



