Rydberg : Studies on tpie Rocky Mountain Flora 617 



7. Stenotus laxuginosus (A. Gray) Greene, Erythea, 2 : 72. 



1894. 



Aplopappus lanuginosus A. Gray, U. S. Expl. Exped. 17 : 347. 

 1862-74. 



This species is a rather anomalous member of the genus, as 

 the leaves are not rigid, and scarcely evergreen. In habit it re- 

 sembles somewhat some species of Pyrrocoma } as for instance, P. 

 inuloides ; but it has the thin involucral bracts and the white pap- 

 pus of Stenotus. It grows on the mountains of Washington, 

 northern Idaho and Montana. 



Stenotopsis gen. nov. 



Low shrubs with fastigiate branches, narrow fasciculate glan- 

 dular punctate leaves and large peduncled heads. Involucre broadly 

 hemispherical ; its bract subequal, almost in a single series, linear 

 lanceolate, thin scarious-margined, not at all hebaceous. Recep- 

 tacle naked, alveolar. Ray-flowers about 12, ligulate, yellow, 

 large, pistillate and fertile. Disk-flowers perfect : their corollas 

 tubular-trumpet shaped, deeply 5-lobed. Anthers obtuse at the 

 base. Style branches stigmatic their whole length, with ovate to 

 lanceolate-subulate appendages. Achenes densely silvery-villous. 

 Pappus of white capillary bristles, rather deciduous. 



The genus contains two known species. It differs mainly from 

 Stenotus in its shrubby habit and glandular punctate leaves. 



Leaves 3-4 cm. long ; rays II-I4 mm. long. t. S. tinearif otitis. 



Leaves 1-2 cm. long ; rays 9-1 1 mm. long, 2. S. interior. 



v/i. Stenotopsis linearifolia (DC.) 



Aplopappus linearifolius DC. Prod. 5 : 347. 1836. 

 Stenotus linearifolius Torr. & Gray, Ft, N. Am. 2 : 238. 1842. 

 This species is a shrub 3—10 dm. high, and grows on dry 

 hills, from Utah to California and Arizona. 



" 2. Stenotopsis interior (Coville) 



Aplopappus interior Coville, Proc. Biol. Soc. Wash. 7: 65. 

 1892. 



Stenotus interior Greene, Erythea, 2 : 72. i8g2. 

 Its range is further southwest, from southern Utah to Arizona 

 and southern California. 



