124 Rydberg : Rocky Mountain flora 



Machaeranthera viscosula sp. nov. 



Biennial with a rosette of basal leaves ; stems few, about 2 dm. 

 high, viscid-puberulent ; basal leaves oblanceolate, petioled, the 

 upper similar or linear, but sessile ; all saliently and coarsely 

 toothed ; inflorescence narrow and racemiform, very viscid ; heads 

 about 1 cm. high ; bracts linear, with a long linear-subulate 

 spreading or reflexed green and very glandular tip, usually longer 

 than the chartaceous lower portion ; rays reddish-purple, 8-10 

 mm. long and fully 1 mm. wide; achenes sparingly strigose ; pap- 

 pus tawny. 



This is closely related to M. viscosa, but differs in the lower 

 stature, the racemiform inflorescence and the narrow saliently 

 toothed basal leaves. 



Colorado: Veta Pass, 1896, Shear 3633; South Park, 

 southeast of Jefferson, 1896, Cowen 3222. 



Xylorrhiza Brandegei sp. nov. 



Perennial with a cespitose caudex, canescent throughout, 

 almost 1 dm. high ; leaves spatulate or the upper oblanceolate, 

 3-4 cm. long, firm, closely and sharply serrate with bristle-tip- 

 ped teeth ; disk about 3 cm. wide ; bracts narrowly linear-lanceo- 

 late, attenuate ; achenes oblong, densely grayish-strigose, pappus 

 tawny; rays rose-purple, 15-20111111. long. 



Closely related to X. coloradensis {Aster coloradensis Gray), 

 but differs in the larger size, longer rays and scarcely spinescent 

 bracts. It grows at an altitude of 3000 m. 



Colorado: San Juan Pass, 1875, Brandegee (type in the 

 Gray herbarium). 



Erigeron nematophyllus sp. nov. 



Depressed cespitose-pulvinate perennial ; flowering stems sev- 

 eral, strigose, about 5 cm. high, few-leaved ; both basal and 

 cauline leaves linear-filiform, 2-4 cm. long, less than 1 mm. wide, 

 strigose; heads solitary, 4-5 mm. high; bracts linear in 1-2 

 series, scarcely at all imbricated, acute, hirsute-strigose ; rays 

 pinkish or white, 4-5 mm. long and I mm. wide ; achenes spar- 

 ingly hirsute. 



This is closely related to E. radicatus, but differs in the very 

 narrow and erect leaves. It grows on rocky hills. 



Colorado: Dale Creek, 1897, Osterliout (type). 



Wyoming: Fort Steele, 1901, Tweedy 4103 ; Sand Creek, 

 1900, Aven Nelson 6993. 



