Rydberg : Studies on the Rocky Mountain Flora G18 



MACRONEMA Nutt. 



This genus was also established by Nuttall in 1840 and re- 

 estabHshed by Greene. The latter included, as is stated before, 

 also Stenotiis pygviacjts Nutt. {Aplopapptis pyguiaciis A. Gray). 

 As the relationship of that species is rather doubtful, I have not 

 included it in the treatment below. The species can be separated 

 as follows : 



Heads radiate. 



Heads small, fastigiate clustered ; disk 5-8 mm. in diameter. 



Leaves broadly obovate, mucronate-cuspidate. I. M. obovatum. 



Leaves oblanceolate, acute or pointed. 2. M. Watsonii. 

 Heads larger, solitary : disk I cm. or more in diameter. 



Leaves oblanceolate, acute. 3. M. stiffruticostim. 



Leaves spatulate, obtuse or mucronate. 4. AI. grindelifoliitiii. 

 Heads discoid. 



Leaves oblong-oblanceolate. 



Outer bracts oblong, acute. ^. /!/. discoideum. 



Outer bracts broadly oblong, obtuse. 6. M. obtusum. 



Leaves linear. 7. J/. Uneare. 



I. Macronema obovatum sp. nov. 



A glandular-puberulent undershrub, 2-3 dm. high, with light 

 yellow bark on the branches. Leaves broadly obovate, 1—2 cm. 

 long, 7—10 mm. wide, mucronate-cuspidate : heads usually 2—3 

 together, about 10 mm. high, and 8 mm. broad : its bracts firmer 

 than in the other species, oblong-linear, abruptly obcuneate-acute 

 at the apex, unequal, imbricated in about 4 series : rays short, 4—5 

 mm. long and i — 1.5 mm. wide, about 10 in number. 



The species is nearest related to M. Watsonii, differing mainly 

 in the broad leaves and the abruptly acute bracts. The type was 

 collected at an altitude of 1600 m. 



Utah : City Creek Cafion, M. E. Jones, 1081. 



2. Macronema Watsonii (A. Gray) Greene, Erythea, 2 : 74. 



1894 

 Aplopappus Watsonii A. Gray, Proc. Am. Acad. 16 : 79. 1881. 

 This grows on mountains at an altitude of 2000-2=500 m., in 

 Utah and Nevada. 



3. Macronema suffruticosum Nutt. Trans. Am. Phil. Soc. II. 



7: 322. 1840 

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

 1865. 



