bank. “‘Spike purple. Leaves stiff. In sterile white sand.’’ March 
1951, Richard Evans Schultes 12094 (Tyrer in Herb. Gray).—Same 
locality. August 12, 1951, Richard Evans Schultes & Isidoro Cabrera 
13517.—Comisaria del Vaupés, Rio Vaupés, Raudal de Yurupari (+ 
350 kts. arriba de Mitt). Alt. 220 m. “‘Espata verdosa; espadice 
amarillo-violaceo.’’ September 24, 1939, J. Cuatrecasas 6963. 
Anthurium crassinervium (Jacq.) Schott Melet. 
1 (1832) 22. 
Anthurium crassinervium appears to be rather wide- 
spread in northern South America, but in the northwest 
Amazon basin it is confined to the granitic, pre-Cambrian, 
dome-shaped mountains, where it occurs often in great 
abundance under conditions of extreme xerophytism. 
The collection Cuatrecasas 6885 establishes its occurrence 
in the Colombian Amazonia. 
Cotompra: Comisaria del Vaupés, Rio Vaupés, Cerro de Mitt. Alt. 
380 m. ““Espadice pardo-violaceo.’? September 17, 1939, J. Cuatre- 
casas 6885, 
VenezugELa: Territorio del Amazonas, Rio Negro, Piedra del Cocui. 
**Terrestrial.’’ December 22-23, 1947, Richard Evans Schultes & 
Francisco Lopez 942%. 
Anthurium gracile (Rudge) Engler in Bot. Jahrb. 
25 (1898) 370. 
A widespread plant of the rain tropics of South Amer- 
ica, Anthurium gracile has apparently not hitherto been 
reported from eastern Colombia. 
Cotompra: Intendencia del Meta, Sabanas de San Juan de Arama, 
margen izquierda del Rio Giejar, alrededores del aterrizaje ‘‘ Los 
Micos.’’ Alt. ca. 500 m. “‘Epifita. Espata purptreo-grisdcea.’’ Jan- 
uary 22, 1951, Jesus M. Idrobo & Richard Evans Schultes 1268. 
Anthurium Idroboanum R. FE. Schultes sp. nov. 
Herba terrestris, usque ad 24 pedes alta, in coloniis in 
silvis densis pluviosisque crescens. Caudiculus magno- 
pere abbreviatus, robustus, internodiis brevissimis. Folia 
rigidissime erecta, valde coriacea, supra atroviridia, sub- 
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