Rydberg : Studies on the Rocky Mountain Flora 634 



3. Hymenopappus scaposus sp. nov. 



Hymenopappiis lutcus A. Gray, PI. Fendl. 97. 1849. Not 

 Nutt. 1 84 1. 



An almost scapose perennial with a (espitose caudex. Stem 

 almost naked, with 1-2 reduced leaves, more or less densely to- 

 mentose : leaves mostly basal, 5-7 cm. long, bipinnately divided 

 into linear segments, 3—10 mm. long, more or less densely tomen- 

 tose, especially at the base : heads few, cor}'mbose, hemispherical, 

 about I cm. high and broad : bracts obovate with yellowish or 

 purplish scarious margins : corollas yellow ; tube and throat each 

 nearly 2 mm. long ; the latter campanulate and longer than the 

 lobes : achenes densely silky, scales of the pappus fully 2 mm. 

 long, longer than the tube of the corolla. 



This species has been confused with H. liitctis Nutt. but is easily 

 distinguished by the long pappus and also by the longer segments 

 of the leaves. H. scaposus grows in dry soil up to an altitude of 

 2200 m. from New Mexico and Arizona to Utah and Nevada. 



Arizona: Vicinity of Flagstaff, 1898, D. T. MacDougal, izg 

 (type). 



New Mexico: Santa Fee, 1897, A. A. &■ E. Gcrinide Heller, 

 3555 > 1847, A. Fendler, 436 ; 1869, E. Palmer, 11. 



Utah : Southern Utah, 1 874, C. C. Parry, loj. 



Nevada: 1868, ^^ Watson, 612. 



4. Hymenopappus arenosus Heller, Bull. Torr. Club, 25 : 200. 



1898 



This resembles somewhat the preceding, but is taller, more 

 leafy, and has much shorter pappus. It grows in sandy soil, up 

 to an altitude of 2200 m., in New Mexico and southern Colorado. 



5. Hymenopappus cinereus sp. nov. 



A grayish tomentose perennial with a cespitose caudex. Stems 

 about 2 dm. high, branched, with 2-4 leaves : these bi-pinnately 

 divided into linear segments 1—2 cm. long and about i mm. wide, 

 sparingly grayish tomentulose : heads corymbose, 8—10 mm. high, 

 10-12 mm. broad, hemispherical or somewhat turbinate: bracts 

 oblong-obovate, with narrow scarious margins : corollas yellow : 

 tube and throat each about 1.5 mm. long; the latter broadly cam- 

 panulate, longer than the lobes : achenes loosely villous ; scales of 

 the pappus variable, in the type fully i mm. long and nearly equal- 



