PITTIER—-REVISION OF THE GENUS INGA, 205 
Type in the U. S. National Herbarium, no. 715742, collected in the vicinity 
of La Palma, southern Darién, Panama, in old clearings, flowers, January 26, 
1912, by H. Pittier (no. 5496). 
This is the only representative of the Pseudingae-Dysanthae so far reported 
from Central America. It differs from the two other species in its wingless 
leaf rachis, but except for the shorter calyx the flowers look exactly like 
those of the Brazilian Inga dysantha Benth. I was not able to collect the 
fruits, but was informed that they are small, flat, and rufous-hairy, the latter 
fact being confirmed by the local name of “guabito peludo.” 
Named in honor of Mr. Paul GC. Standley, Assistant Curator of the U. S. 
National Herbarium. 
Section 5. EUINGA. 
As already noted by Bentham, the identification of the species of 
this group is extremely difficult, and it may be added that little 
progress has been made since the publication of that author’s Re- 
vision of the Mimoseae in 1875. Few new species have been added 
and we are still in the dark with reference to the fruit characters 
of a large number of the old ones. Recent investigations in Central 
America have brought to light the existence of a number of forms of 
the Inga insignis type, characterized mainly by tetragonous fruits, 
accompanied by flowers not unlike those of the Longiflorae. These 
species, eight in number if we add J. fendleriana Benth., which 
probably belongs here, form in the section a distinct series, which is 
here separately treated under the name of Tetragonae, referring to 
the quadrangular cross section of the fruit. The remaining species, 
except one, resemble more or less J. edulis as to the legume, in which 
the many-sulcate margins are expanded so as to more or less obliter- 
ate the faces. On account of this characteristic form of the fruit 
this series, which may be again subdivided, is designated by the 
term Sulcatae. 
These two series seem to constitute very natural groups and the 
distinction drawn between them will certainly help the student in 
determining the species of this very large section. As mentioned 
above, this new arrangement excludes one species, /. sessélis (Vell.) 
Mart., which, in my opinion, would be better placed with Pseudinga, 
among the Vulpinae. 
Series 1. TETRAGONAE. 
DESCRIPTIONS OF OLD AND NEW SPECIES. 
Of the Central American species of this group, two, Inga pittiert 
Micheli and J. preussii Harms, have been published previously. 
As the original diagnosis of the first is not very satisfactory and we 
have in our collections the fruit of the second, not known hereto- 
fore, I deem it useful to repeat here full descriptions of both. Be- 
sides these, four new species are introduced. The six have in com- 
