fruit varies from lanceolate and oblong to ovate, but that 
none are ellipsoid-cordate. In view of the many resem- 
blances between these two genera, however, it is possible 
that a future monographer of Arracacia might emend 
the genus-concept to include Neonelsonia. 
Distribution 
Specimens of Neonelsonia acuminata in the Harvard 
University Herbarium indicate that its range is Colom- 
bian and Ecuadorean, extending from the Departamento 
del Cauca in the north to the Provincia de Azuay in the 
south at elevations of 2450 to 3660 meters. My speci- 
mens from Sibundoy in the Comisaria del Putumayo, 
Colombia, were collected at 2100 meters, extending the 
known altitudinal limits of the species. Another collec- 
tion, from San Diego near Guachucal, Narifio, is within 
the previously known range. 
Because Neonelsonia acuminata is not readily distin- 
guished in the field from Arracacia Pennell and from 
A. Wigginsii when fruits are not available, it is well to 
note the distribution of these two species of Arracacia 
in central Colombia and central Ecuador, overlapping 
the range of N. acuminata. The specimens of Arracacia 
Pennellit available to Constance (8) when the species was 
described came from Cundinamarca, Norte de Santander 
and Santander in Colombia at elevations of 3000 to 3800 
meters. Likewise, the specimens of Arracacia Wigginsu 
were collected in Cafiar and Azuay (one at 8660 meters) 
in Ecuador. A later collection, now in the Harvard 
University Herbarium, is also from Azuay but at 2740 
meters. Our present scanty knowledge indicates that of 
these three species, only Neonelsonia acuminata is found 
in southern Colombia and northern Ecuador and that 
its altitudinal tolerance extends to lower elevations than 
does that of the two species of Arracacia. 
[ 193 ] 
