418 STANDLEY: CHENOPODIACEAE 
cornutum, but it differs in no way from the mass of Mexican ma- 
terial. Tropical’ forms: have been referred commonly to C. 
foetidum Schrad., a different plant of which the writer has seen 
no North American specimens. 
CHENOPODIUM DISSECTUM (Mogq.) Standley, N. Amer. Fl. 21: 26. 
1916 
Ambrina dissecta Moq. Chenop. Enum. 38. 1840. 
Apparently this is a very rare plant. Before seeing material 
of it the writer presumed, from Moquin’s description, that it was 
only a form of C. incisum. It is, however, quite distinct, being 
more closely related to C. Botrys L.,as was apparent when the two 
following collections were discovered, both of which agree perfectly 
with the original description. 
MExIco: Saltillo, 1898, Palmer 353; Valley of Mexico, ence” 
ner 437. 
CHENOPODIUM VAGANS Standley, N. Amer. Fl. 21: 26. 1916 
Chenopodium chilense Schrad. Ind. Sem. Hort. Gotting. 1832: 
2.. 1832; Linnaea 8 (Litt.-Ber.): 25. 1833. Not C. chilense 
Pers. 1805. . 
Although most of the segregates from C. ambrosioides are too 
poorly marked to deserve specific rank, the one to which the above 
names have been applied seems to be an exception. It has ap- 
parently been overlooked by American botanists, the collections 
at hand having been identified mostly as C. anthelminticum L. 
C. vagans differs from all the forms of C. ambrosioides in its white- 
villous stems and in the conspicuously dentate or sinuate-pinnatifid 
leaves of the inflorescence. In fruit the plants have a character- 
_istic appearance because of the very numerous, much elongate, 
slender spikes. The species is a native of Chile, and probably 
is adventive in California. The following specimens have been 
examined : Sep 
CALIFORNIA: Clinton, Hansen 2020; Ione, Braunton 1185; 
Tehama, Ward 101; Ukiah, Chestnut 349; North Fork, Griffiths 
4648; Mendocino, H. E. Brown 949; Crystal Sorings, Elmer 4134; 
without locality, 1860-67, Rattan. 
A specimen ‘Ex Herb. E. & C. Faxon”’ collected at Pe 
