CONTRIBUTIONS TO WESTERN BOTANY. 699 



This grows only in the Larrea belt, and abounds on 

 drifting sand dunes in the hottest places. 



Ch^enactis carphoclinia var. attenuata (Gray, P. 

 A. A. 10, 73). 



ChcBnactis atteimata Gra}^, 1. c. 



No. 5036au. April 13, ten miles below Mica Spring, 

 Nevada, in gravel, at 2000° alt. 



No. '5045r. April 13, three miles below Mica Spring, 

 Nevada, in gravel, 4000° alt. 



These specimens have very many awns on the recep- 

 tacle. It would seem that the presence or absence of 

 awns is accidental rather than specific. This fact also 

 noted by Mrs. Brandegee, in Zoe. 



F. V. Coville, in the Botany of the Dea,th Valley Exp., 

 p. 134, says: " This plant has not been reported since its 

 original discovery." It was collected in 1884, by me, at 

 Yucca, Arizona, and reported in my lists published in the 

 same year. See " Flora of Arizona, First Fascicle." 



Chcenactis car-phoclinia Gray. 



No. 5036Z. April 13, near Hole in the Rock, 8 miles 

 above Stone's Ferry, Nevada, at 1500° alt., in gravel. 



There is a great deal of doubt in my mind of the 

 validity of the characters in this group. In this particular 

 number there are no awns on the receptacle, and the 

 bracts have a prominent midrib, but in other respects it 

 corresponds with this species. 



Ch^nactis alpina (Gray, Syn. Flora, 341). 



ChcBnactis Douglasii var. al-pina Gray, 1. c. 



This species is very well defined, as to the high alpine 

 specimens, shows little variation, but it has been confused 

 with perennial forms of C . Douglasii. It is characterized 

 by being c^spitose, often forming large mats above timber 

 line, stems not filiform; leaves about 2' long, with many 

 pinnate, narrowly oblong segments, which are rounded 



