616 Rydberg: Studies on the Rocky Mountain Flora 



puberulent, with a very narrow scarious margin, imbricated in 2 

 series : achenes somewhat fusiform, about 4 mm. long, grayish or 

 white villous as in the other species. 



This species is nearest related to the preceding, but character- 

 ized by the less rigid leaves, the fewer and narrower involucral 

 bracts, the involucre being more that of S. lanuginosiis. 



The type was collected on dry open hills. 



Montana: Belt Mountains, 1886, F. W. Anderson, 3561. 



* 



4. Stenotus caespitosus Nutt. Trans. Am. Phil. Soc. II. 7 : 335 



1840 



Chrysopsis caespitosa Nutt. Tour. Acad. Phila. 7 : 33- I ^34- 



Aplopappus acaulis var. glabratus D. C. Eaton, King's Exped- 

 5 : 161. 1871. 



This grows on dry hills and mountains, at an altitude of 1000- 

 3000 m., from Montana and Idaho to Nevada, Arizona and 

 Wyoming. 



* 5. Stenotus falcatus sp. nov. 



A glabrous cespitose perennial, with a woody caudex, resem- 

 bling 5. armerioides in habit. Flowering stems 10-15 cm. high, 

 leafy, 1-3-cephalous : basal leaves oblanceolate, rigid, obtuse or 

 acute, 4-5 cm. long, 4-6 mm. wide, 3-ribbed ; stem leaves linear, 

 4-7 cm. long, 2-3 mm. wide, more or less falcate : heads about I 

 cm. high : bracts lanceolate, acute, with scarious margin : rays 6-7 

 mm. long, 2.5-3 rnm - wide. 



This species differs from ^. armerioides, which it closely re- 

 sembles in the narrower and acute involucral bracts. It grows in 

 barren soil at an altitude of about 1500 m. 



Utah : Red Creek, 1877, Dr. & Palmer, 202 (type) ; Milford, 

 1880, M. E.Jones, 1804. 



6. Stenotus armerioides Nutt. Trans. Am. Phil. Soc. II. 7 : 



335- 1840 



Aplopappus armerioides A. Gray, Syn. Fl. I 2 : 132. 1884. 



This species grows on dry hills and bad-lands, at an altitude of 

 1000-2000 m., from Manitoba and Assiniboia to Utah, N cU ' 

 Mexico and western Nebraska. 



* Unless otherwise stated, the types of the new species described are preserved in t 

 herbaria of the New York Botanical Garden or of Columbia University. 



