980 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



1. Chaenactis carphoclinia A. Gray in Torr., U. S. and Mex. Bound. 



Bot. 94. 1859. 



Mohave, Pinal, Pima, and Yuma Counties, up to 2,500 feet, plains 

 and mesas, March to May. Southern Utah to southern Arizona, 

 southeastern California and northern Baja California. 



The type of var. attenuata (A. Gray) M. E. Jones (C. attenuata A. 

 Gray), distinguished by having the pappus paleae of all the achenes 

 very short and usually obtuse (those of the central achenes in the 

 typical form being at least half as long as the corolla and usually 

 acuminate), came from Ehrenberg, Yuma County (Janvier). The 

 variety has been collected also at Papago Well (western Pima County) 

 and in the Gila Mountains (Yuma County) . 



2. Chaenactis fremonti A. Gray, ^mer. Acad. Arts and Sci. Proc. 



19: 30. 1883. 

 Mohave, Maricopa, Pinal, and (doubtless) Yuma Counties, 1,000 

 to 3,300 feet, plains and mesas, March to June. Southwestern Utah, 

 southern Nevada, western Arizona, and southeastern California. 



3. Chaenactis xantiana A. Gray, Amer. Acad. Arts and Sci. Proc. 



6: 545. 1865. 

 Hackberry, Mohave County, 3,550 feet (Jones 4561), Havasu 

 Canyon, Coconino County. Eastern Oregon to southern California, 

 western Nevada, and western Arizona, May and June. 



4. Chaenactis macrantha D. C. Eaton in King, Geol. Expl. 40th Par. 



5: 171. 1871. 

 Kingman and westward (Mohave County) , also near Tucson (Pima 

 County), about 3,000 feet, dry plains and slopes, April to June. 

 Southern Utah and Nevada, western and southern Arizona, and south- 

 eastern California. 



5. Chaenactis stevioides Hook, and Arn., Bot. Beechey Voy. 353. 



1840. 



Apache County to Mohave County, south to Graham, Pinal, and 

 Yuma Counties, 1,500 to 6,300 feet, very common on dry mesas and 

 plains, March to May. Wyoming to Idaho, south to New Mexico, 

 southern California, and Sonora. 



The var. brachypappa (A. Gray) H. M. Hall (C. brachypappa A. Gray) 

 differs in having the paleae of the pappus in all of the flowers blunt 

 and not more than 2 mm. long, whereas, in typical C. stevioides, the 

 central flowers have the paleae at least two-thirds as long as the 

 corolla, and usually acute. The variety is not typically developed 

 in Arizona, but an approach to this form is shown by collections in 

 the Sacaton Mountains, Pinal County (Peebles 11038), and at Chlo- 

 ride, Mohave County (Kearney and Peebles 11204). The var. 

 thornberi Stockwell, which differs in being coarser and having yellow, 

 or sometimes lemon or cream flowers, those of the other forms being 

 white, is cited from Yavapai, Pinal, Pima, and Santa Cruz Counties, 

 type from Wilmot, near Tucson (Thornber 385). 



6. Chaenactis douglasii (Hook.) Hook, and Arn., Bot. Beechey Voy. 



354. 1840. 



Hymenopappus douglasii Hook., Fl. Bor. Amer. 1: 316. 1834. 



Jacobs Lake to Fredonia, northern Coconino County, about 7,000 



feet, open pine forest (Peebles 13041, 13052). Alberta and British 



