STUDIES OF TROPICAL Woe PHANEROGAMS— 
By Paur C. STANDLEY. 
INTRODUCTION. 
The third paper of this series? is devoted almost wholly to trees 
and shrubs of tropical and subtropical North America, chiefly those 
of Mexico. The principal exception is an account of the Panama- 
nian species of Leiphaimos, a genus of the Gentianaceae, whose rep- 
resentatives are interesting because of their saprophytic habit and 
the diverse forms of their flowers. 
The writer has been engaged recently upon a proposed systematic 
account of the woody plants of Mexico, and it is as a result of this 
work that many of the new species here described are published. 
Most of the latter belong to the group Leguminosae, although repre- 
sentatives of several other families of Mexican plants are described. 
There is included, in addition, a brief account of the Mexican and 
Central American species of Hrythrina. 
In the course of work upon the family Rubiaceae for the North 
American Flora, numerous plants have been discovered which are 
not referable to any of the published species. Some of the most in- 
teresting of these have been discussed elsewhere,? but others are 
treated in the present paper. Most of the Rubiaceae described here 
belong to the genera Fandia and Hoffmannia. 
THE MEXICAN SPECIES OF ATELEIA. 
Several species of At¢eleéa have been described from South America 
and the West Indies, but only one, A. pterocarpa DC., the generic 
type, has been reported from Mexico. Ateleia pterocarpa was based 
upon one of Sessé and Mociiio’s plates, and the writer has been un- 
able to find any published reference to the collection of specimens. 
There are, however, in the National Herbarium several Mexican col- 
1See also Contr. U. S. Nat. Herb. 17: 427-458. pls. 24-31. 1914; 18: 87-142. 
1916. 
2 Standley, Paul C., Blepharidium, a new genus of Rubiaceae from Guatemala, 
Journ, Washington Acad. Sci. 8: 58-60. 1918; Omiltemia, a new genus of 
Rubiaceae from Mexico, op. cit. 8: 426, 427. 1918. 
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