Rydberg : Studies on the Rocky Mountain Flora 628 



Leaves mostly piiinatjfid or at least iiicisedly toothed. 

 Plant canescent or white-tomentose. 

 Plants loosely white-tomentose. 



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



or slightly toothed. 5- ^- i'"-'^^"^'- 



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. terebiJitltacea. 

 Plants more or less hispid, neither canescent nor tomentose. 



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



S. B. macrophylla. 

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



9. B. hirsuta. 



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



7: 350. 1840 



BuptJialmiiiui saggittatitni 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 12 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. Txvccdy, 10.^ 



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



7 : 351- 1840 

 The name of this plant is i-ather 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 1 899 {no. 21 14), may 

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



