Rydberg : Studies on the Rocky Mountain Flora 628 



Leaves mostly pinnatifid or at least incisedly toothed. 

 Plant canescent or white-tomentose. 

 Plants loosely white-tomentose. 



Stem 1-3 dm. high ; segments of the leaves 1-3 cm. long, ovate, entire 



or slightly toothed. 5- B. iiicana. 



Stem 3 dm. or more high ; segments of the leaves 3-5 cm. long, lanceo- 

 late, coarsely toothed. 6. B. Jloccosa. 

 Plant finely canescent, tomentose only on the involucre ; .some of the leaves 

 merely toothed. 7. B. terebinthacea. 

 Plants more or less hispid, neither canescent nor tomentose. 

 Disk 3-4 cm. broad ; segments of the leaves mostly entire. 



8. B, macrophylla. 

 Disk 2-2.5 cm. broad ; segments of the leaves mostly toothed. 



9. B. Iiirsuta, 



I. Balsamorrhiza sagittata (Pursh) Nutt. Trans. Phil. Soc. II. 



7: 350. 1840 



Bupthabiiiuvi saggittattun Fl. Am. Sept. 564. 18 14. 



Growing on hillsides at an altitude of 1000-2500 m., this spe- 

 cies is not uncommon from Alberta and British Columbia to Cali- 

 fornia, Colorado and the Black Hills of South Dakota. 



2. Balsamorrhiza tomentosa sp. nov. 



A white-tomentose perennial with thick root ; but the tomen- 

 tum is shorter and finer than in B. sagittata. Basal leaves with 

 long petioles ; blades about 1 2 dm. long, ovate-lanceolate with 

 subcordate bases, i 5-20 cm. long, acute, coarsely toothed ; stem- 

 leaves generally two, including the slender petioles about i dm. 

 long, lanceolate to linear elliptic, acute at both ends : stem 3-4 

 dm. high, involucre densely floccose, over 2 cm. broad : outer 

 bracts half longer than the inner, reflexed : rays about 3 cm. long 

 and I cm. wide ; achenes glabrous. 



Closely related to B. sagittata this species differs mainly in the 

 toothed leaves, shorter tomentum and longer outer bracts. 



Wyoming : Headwaters of Tongue River in the Big Horn 

 Mountains, 1898, F. Tzvccdy, lo."^ 



3. Balsamorrhiza deltoidea Nutt. Trans. Am. Phil. Soc. II. 



7: 351. 1840 

 The name of this plant is rather unfortunate, as the leaves are 

 rarely deltoid, but on the contrary usually broadly cordate. B. 

 deltoidea ranges from British Columbia to California and Idaho. 



*A specimen collected by Tweedy on Teepee Creek in .1899 [no. 21 14), may 

 also belong here. It has smaller heads, not reflexed bracts and lanceolate leaves. 



