14. 
The specific location of a species is described in relation to 
existing landmarks and to the numbered grid now being constructed 
for the entire Center (see Figures 6 and 7). The units of the grid 
are in hectares (a hectare equals 2.471 acres or 10,000 square meters). 
The hectare was chosen to facilitate the future establishment of sample 
plots, since it can easily be broken down into smaller metric units. 
Once the location of a species is established the oe may check the 
soil and vegetation maps (Figures 2 to 5) for additional details. 
The remaining annotation data summarize the vegetation of the 
collecting sites. The dominant species are listed when these are 
apparant. Also listed are "associate species" collected or observed 
at the same location and in the same stratum. Further investigation 
of the coincidence of these associate species should lead to more 
reliable correlations among them and with their habitats. Additional 
details of the vegetation may be obtained from Figures 4 and 5 and 
from Table I. 
The specimen collection numbers of each species follow its 
annotation. All specimens collected by the writer are preserved in 
the U. S. National Herbarium, Washington, D. C. Duplicate specimens 
will be filed at the Chesapeake Bay Center. A few additional specimens 
collected by Dr. H. David Hammond are kept in the Howard University 
Herbarium, Washington, D. C. 
