400 FERRIS: TAXONOMY AND 
partite, callous bracts. The species of the pilosa group have a 
puberulent or pilose pubescence and their bracts are typically 
linear, though they are parted in A. viscida and A. Hanseni. 
The genus is confined to western America and is characteristic 
of California and the Great Basin. Of the twenty-one species, 
there are but five that are not recorded from California and nine 
are known only from that state. According to the present records 
the range of the genus extends from Washington and southwestern 
Montana to Sonora, Chihuahua, and northern Lower California. 
The members of the genus are found principally in open, 
exposed places in the Upper and Lower Sonoran and the Arid 
Transition Zones. Certain of the species may at times be met 
with in the Humid Transition Zone, but they occur only on 
exposed slopes that are truly “islands” of Upper Sonoran. All 
the species of the section Chloropyron, which is in part coastal, 
are found in salt marshes and on alkaline soils. This unusual 
habitat may account for the fact that this group appears not to 
conform to the ordinary zonal lines. 
In preparing this paper I have had the opportunity of examin- 
ing the material in the herbaria of the following institutions: the 
National Herbarium, the University of California and Stanford 
University. 
I wish to express appreciation of the kindness shown me at the 
University of California during my work in that herbarium and 
to the National Herbarium for the loan of material. I also wish 
to thank Dr. L. R. Abrams for his advice and assistance and Dr. 
B. L. Robinson, of the Gray Herbarium, for fragments and 
photographs of types. 
ADENOSTEGIA Benth. 
Adenostegia Benth. in Lindley, Nat. Syst. ed. 2. 445. 1836. 
Cordylanthus Nutt.; Bentham in De Candolle, Prodr. ro: 597- 
1846. 
Chloropyron Behr, Proc. Calif. Acad. 1: 6r. 1855. 
Rigid, summer-blooming annuals with divaricate or paniculate 
branches and yellow roots. Leaves alternate, entire, parted or 
dissected, those subtending the branches much longer than the 
others, deciduous with age; flowers in spikes, heads, or scattered 
along the branches; floral bracts entire, dissected, or parted; 
