Vol. 44 No. 9. 
BULLETIN 
OF THE 
~ TORREY BOTANICAL CLUB 
SEPTEMBER, 1917 
The Chenopodiaceae of the North American Flora 
PauL CARPENTER STANDLEY* 
The North American Chenopodiaceae have been treated pre- 
viously in two monographic accounts. The first of these was that 
of Moquin-Tandon in De Candolle’s Prodromus,{ published in 
1849. Moquin had access to a very limited number of specimens, 
for at that time scarcely any collections had been made in the 
western United States and northern Mexico, the parts of the 
continent in which the family is most extensively represented. 
The other monograph of the North American species, by Watson, 
appeared in 1874.t The latter author had the advantage of fairly 
ample collections, and his monograph is very useful even now, 
although many additional species have been described in recent 
years. Watson enumerated 83 species; the present writer, in the 
treatment of the family for the North American Flora,§ has 
recognized 223. The great increase in number of species in the 
last forty years is due partly, of course, to a different conception of 
specific limits, but chiefly to more extensive exploration. Several 
European and South American species have become naturalized 
only in comparatively recent years. It is not probable that the 
present number will be <a increased unless from parts of 
Mexico still unexplored. 
* Published by permission of the Secretary of the Smithsonian Institution. 
Proc. Amer. Acad. 9: 82-126. 1874. 
§ 21: 3-03. 27 N 1916. 
_ [The BuLLETIN for August (44: 369-410) was issued August 10, reais 
