EXPLANATION OF THE MAP 
This map is based upon a study of several old man- 
uscript maps; Conzatti’s Mapa biologico y minerolo- 
gico del Estado de Oaxaca (1918), seale 1:500,000 ; the 
1937 edition of the map of Oaxaca of the Departa- 
mento de Geogrifico (Mexico), scale 1:1,000,000; 
the map of North America, section E-14, of the Amer- 
ican Geographical Society of New York (1938), scale 
1:1,000,000; the maps in Bevan (2); and upon field 
observations made by the writer in 1938 and 1939. 
Many places which are of historical interest to 
botanists have been indicated on the map. The lo- 
calities visited by the early botanical explorers (Gal- 
eotti, Hartweg, Jiirgensen, Karwinski, Liebmann, 
Nelson, ete.) are included. 
Scale: approximately 1:1,670,000 
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