222 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
New York Botanical Garden a number of new species have been 
distinguished, so that it seems desirable in connection with their 
description to present a summary of the species now known from 
America. 
All the American species of the genus are very closely related and 
belong to the section Racoubea of the subgenus Myriantheia, as the 
genus is arranged by Warburg in the Pflanzenfamilien. The charac- 
ters of most significance for the separation of the species are found 
in the sessile or pedicellate flowers, the number of stamens in the 
fascicles, the separate or united style bases, the pubescence of the 
leaves, and the shape of the perianth segments. 
Reference has already been made to the doubtful association of 
Aublet’s genus Napimoga with Homalium. Bentham in 1860 was 
of the opinion that it “can scarcely be a congener, not having the 
characteristic glands; the analyses given, rude as they. are, are not 
to be depended on for correctness, and afford no evidence of the plant 
belonging even to the same natural order.” In Bentham and 
Hooker’s Genera and in later general works, however, Napimoga is 
referred without comment to Homalium. It seems to the writer, in 
view of the important differences indicated by Aublet’s description 
and figures, that Bentham’s earlier view is the correct one, and that 
the genus Napimoga should again be placed in the list of genera of 
uncertain position. 
In addition to the material in the National Herbarium, to which 
have recently been added the specimens of this genus in the herbarium 
of Captain John Donnell Smith, I have been able through the kind- 
ness of Dr. N. L. Britton and Dr. B. L. Robinson to study the material 
in the herbarium of the New York Botanical Garden and the Gray 
Herbarium. The location of the specimens cited has been indicated 
in parenthesis.’ 
1G=Gray Herbarium; N=U. S. National Herbarium; Y=Herbarium of the 
New York Botanical Garden. 
