SALTBUSHES AND THEIR ALLIES IN THE UNITED STATES 19 
Composition (water-free basis) 
Sample Moisture Teen 
Ash Epber Crude | ee Mt Protein | Pento- 
% extract fiber pete sans 
extract | | 
Per cent | Per cené | Per cent | Per cent | Percent | Per cent | Per cent 
Department 10907 (G)_________- 5. 4 15. 9 4.3 2301 42.9 1822 12.0 
INMassachusetts (28)2_.. eS 80. 8 15.8 3.9 B}8' 46. 4 20, Gules eo 
As a range plant, lamb’s-quarter is eaten freely by sheep and cat- 
tle. Apparently it is a very good feed. 
CHENOPODIUM ARIZONICUM Standl. 
Chenopodium arizonicum (Pl. VII, fig. 2) grows to be 2 feet high 
or more under favorable conditions. Its leaves are pale or dark- 
green above and scurfy beneath. Its slender, widely spreading 
branches bear an abundance of fruit. Like all other species of this 
genus, it accommodates its size to the water supply. In seasons or 
places of scanty water supply the plants are small and dry up soon, 
but they usually produce some seed. This species is one of several 
closely related species of annual herbs that grow in the mountains, 
foothills, and outwash plains in the southwestern United States. So 
far as is now known from collections, it grows only in southern Ari- 
zona. It 1s, however, very similar in appearance to other species that 
have a much wider distribution. This species prefers the slight 
shelter afforded by scattering mesquites or other shrubs and trees. 
Department sample 7217 (W), consisting of mature plants in full 
leaf and fruit, collected under a low mesquite tree on the Santa 
Rita Range Reserve, Pima County, Ariz., at an elevation of 4,000 
feet, September 9, 1914, contained, on an air-dry basis, 5.2 per cent 
of moisture, and, on a water-free basis, 12.5 per cent of ash, 2.8 per 
cent of ether extract, 31.1 per cent of crude fiber, 42.7 per cent of 
nitrogen-free extract, 10.9 per cent of protein, and 12.6 per cent of 
7 pentosans. 
Like the rest of the species closely related to it, C. arizonicum is 
important as range forage. When produced abundantly, horses do 
not eat the plants while ereen, probably because of the abundance 
of hetter feed. The absence of well- -orown plants on the open cattle 
range, however, indicates that cattle eat them freely during the 
growing season. 
CHENOPODIUM CYCLOIDES A. Nels. 
Chenopodium cycloides (PI. VIII, fig. 1) is a native annual herb, 
often reaching a height of 31% to 4 feet. It branches freely, pr odue- 
ing erect slender stems, that bear narrow ereen leaves, an inch or so 
long, and many flat, discoid reddish or brownish-black seeds, to 
which the calyx remains attached like a little membranous wing. 
_ This seed structure is eminently suited to the drifting sands where 
these plants grow. It grows in the drifting sand dunes about the 
_ bases of the low mesquite and other bushes on the ranges of southern 
_ New Mexico, where it is sometimes abundant. It is also known 
from similar regions in western Kansas, 
