PLANTAE COLOMBIANAE XVIII 
PLANTARUM UTILIUM SPECIEL DUAK NOVAK 
BY 
Ricuarp Evans Scuunres 
Durinc the course of ethnobotanical investigations in 
the northwestern part of the Amazon, two new species 
which are used in the primitive economy of the region 
have been discovered. The diagnoses of these two con- 
cepts are herewith published. 
The illustrations that accompany the descriptions were 
made possible through a grant from the National Science 
Foundation for studies of the phytogeography of the 
northwest Amazon. 
ARACEAE 
Anthurium infectorium P. 1). Schi/tes sp. nov. 
Planta terrestris, non scandens, in arenis crescens. 
Caudiculus magnopere abbreviatus, robustus, internodiis 
brevissimis. Folia rigidissime erecta, valde coriacea, 
glabra supra atroviridia, subtus pallide viridia, petiolis 
strictis robustis, basi haud dilatatis: lamina elliptica vel 
elliptico-lanceolata, leviter marginata, basi sensim atten- 
uata, apice breviter apiculata, usque ad 55 cm. longa, 
26 cm. lata, nervo centrali robusto, recto, siccitate sub- 
stramineo, usque ad apicem penetrante, supra leviter sed 
subtus valde elevato, nervis secundariis vel lateralibus 
arcuatis, non confluentibus. Inflorescentia erecta sed 
leviter arcuata, pedunculo usque ad 75 cm. longo, plus 
