194 University of California Publications in Botany. [VOL. 3 



rollas commonly more or less enlarged : involucre 6 to 9 mm. high ; 

 bracts obtuse or merely acutish, the midrib obtuse : pappus-paleae 

 of the disk-achenes 4, oblong-lanceolate, in the typical form nearly 

 equalling the corolla and acute. 



Lower Sonoran Zone of the Colorado and Mohave deserts, 

 east to Arizona, north to Idaho ; very common and mostly typical 

 in the eastern part of the Colorado Desert, less plentiful in the 

 western and northern parts of the Mohave Desert, where it grades 

 into the var. brachypappa. Specimens examined : Colorado Des- 

 ert, Hall, nos. 5903, 5935, 6018 ; Ash Hill, Mohave Desert, Hall 

 no. 6099; Antelope Valley, Hall, no. 3033; Morongo, Colorado 

 Desert, Parish, no. 1213 ; Catalina Mts., Arizona, Lemmon, no. 

 194 ; Diamond Creek Canon and near Kingman, Arizona, Wilson; 

 Diamond Valley, Utah, Goodding, no. 891. 



Var. brachypappa (Gray) Hall, comb. nov. C. brachypappa 

 Gray, Proc. Am. Acad. viii. 390 (1873). Leaf-segments thick 

 and short, obtuse: marginal corollas not enlarged: pappus re- 

 duced to a mere crown of obtuse erose paleae or in the central 

 flowers one of these often twice as long as the others, but even then 

 less than 1 mm. long. Near Independence, Inyo Co., S. W. Aus- 

 tin, no. 500 ; southeastern Tulare Co., in the Pinon belt between 

 Kernville and Cannell Meadows, about 1500 m. alt., Hall & Bab- 

 cock, no. 5101 ; Panamint Mts., Inyo Co., Coville & Funston, no. 

 532, also Hall & Chandler, no. 6947 ; Cuddy Valley, northeastern 

 Ventura Co., Hall, no. 6318; Frazier Mt., Ventura Co., in the 

 Transiton Zone (!), Hall, no. 6608; Colorado Desert, Hall, no. 

 5874; Maturango Kange, Purpus, no. 5457; Lone Pine, Brande- 

 gee; Johannesberg and Ord Mts., Hall & Chandler, nos. 6876. 

 6778. The pappus in the extreme form is very different from 

 that in typical C. stevioides, but, as shown under C. Fremonti, 

 pappus characters are of little specific value in this group. My no. 

 3033, cited under the species, is an intermediate form, the disk- 

 pappus consisting of 3 rather obtuse paleae one-half as long as the 

 corolla and an additional one commonly a little longer and acut- 

 ish. The series is completed by my nos. 5874 and 6318 in which 

 the pappus consists (in central flowers) of 3 obtuse paleae nearly 

 as short as in typical brachypappa and a fourth palea about one- 

 half as long as the corolla and either obtuse or acute. 



