Rydberg : Studies on the Rocky Mountain Flora 619 



.This species grows in the mountains of Oregon and California 

 up to an altitude of 3000 m. It has also been reported from 

 Wyoming, but possibly some specimens of the next have been mis- 

 taken for it. 



4. Macronema grindelioides Rydberg, Mem. N. Y. Bot. Garden, 



1 : 384. 1900 



The habitat of this species is rocky places on mountain-sides, 

 at an altitude of 2500-3000 m. It grows in Montana, Idaho and 

 northern Wyoming. 



5. Macronema discoideum Nutt. Trans. Am. Phil. Soc. II. 7 : 



322. 1840 



Aplopappus Macronema A. Gray, Proc. Am. Acad. 6 : 542. 

 1864. 



This species grows on the higher mountains at an altitude of 

 2500-3000 m., from Wyoming and Colorado to California. 



v 



6. Macronema obtusum sp. nov. 



A dense glandular-pubescent undershrub, 2—4 m. high, with 

 white-tomentose branches. Leaves oblong-oblanceolate, about 

 3 cm. long and 6 mm. wide, obtuse or mucronate : heads about 

 18 mm. high, 10-18 mm. in diameter: their bracts linear, acute, 

 scarcely more than half as long as the flowers, subequal, except 

 the outermost, which are foliaceous, broadly oblong, obtuse or mu- 

 cronate : rays none. 



The species is closely related to the preceding, differing in the 

 stouter habit and the larger and broader, more obtuse outer bracts. 

 It grows on high mountains at an altitude of about 2500 m. 



Colorado: South Cottonwood Gulch, 1892, C. S. Sheldon, 

 58 j8 (type) ; Twin Lakes, 1873, /<?//// Wolfe, 451. 



7. Macronema lixeare Rydb. Mem. N. Y. Bot. Garden, 1 : 384. 



1 900 



In habit, this species resembles some species of Chrysothamnus 

 and Prof. Aven Nelson insists that it should be referred to that 

 genus. It has, however, the foliaceous outer bracts and long style- 

 appendages of Macronema and is clearly congeneric with the two 

 preceding species. It cannot very well be referred to Chrysotham- 

 nus, for it lacks the most essential character of the genus, viz., the 



