Flowers yellow. Latex white, watery. Bark thin and brittle.’’ Sep- 
tember 1948, Francisco Lopez 2.—Comisaria del Amazonas, Leticia. 
*“*Large tree with large buttress roots. Trunk columnar above buttress 
roots. Flowers yellowish. Latex watery, white.’’ September 1948, 
Francisco Lopez 3,—-Comisaria del Vaupés, Rio Guainia, near Sejal. 
**Enormous tree, 80 ft. tall with large flaring buttress roots. Latex 
thin, white. Bark thin, hard, dark tan, smooth. Buds yellowish.’’ 
June 1948, Richard Evans Schultes & Francisco Lépez 10057 .—-Comis- 
aria del Vaupés, Rio Guainia, at base of Cerro Monachi. ‘‘Enormous 
tree 85 ft. tall with extensive buttress roots. Latex white, thin.’’ 
June 1948, Richard Evans Schultes & Francisco Lopez 10135.—Comis- 
aria del Vaupés, Rio Guainia, Cafio Nani below San Antonio, ‘‘But- 
tressed tree 75 ft. tall. Trunk columnar, diameter 18—20 inches. 
Latex watery, white, sparse.”’ June 1948, Richard Evans Schultes & 
Francisco Lopez 10163.—-Comisaria del Caqueta, Rio Caqueta, La Pe- 
drera, at Angostura. ‘“Tree 80 ft. tall; huge buttresses; trunk col- 
umnar, 2 ft. diameter above buttresses. Bark hard, reddish brown. 
Latex very thin, white, not coagulating. Flowers yellow.’’ July 16, 
1948. Richard Evans Schultes & Francisco Lopez 10221.—Comisaria del 
Caqueté, Rio Caqueta, La Pedrera, at Angostura. ‘‘Corpulent tree 
55 ft. tall, diameter above buttresses 15 inches. Bark hard, thin, red- 
dish brown. Latex thin, watery, white, not coagulating. Flowers 
yellow.”’? July 16, 1948, Richard Evans Schultes & Francisco Lépez 
10222.—Comisaria del Amazonas, Leticia. “‘Corpulent tree 75 ft. 
tall. Extensive buttress roots up to 6 ft. high. Bark dark brownish- 
tan, thin, hard. Flowers yellow.’ November 1948, Richard Evans 
Schultes & Francisco Lopez 10257. 
Senefeldera chiribiquetensis PR. 1. Schultes & 
L. Croizat in Caldasia 8 (1944) 122. 
Matching the type and topotype material of Senefeld- 
era chiribiquetensis pertectly, Cuatrecasas 7682 establishes 
the occurrence of this curious endemic slightly north- 
westward of the type locality which is the confluence of 
the Rios Macaya and Ajaju in the Apaporis drainage- 
area. More interesting, however, is the discovery, through 
Cuatrecasas 7682, that Senefeldera chiribiquetensis, hith- 
erto believed to be confined to cretaceous quartzite hills, 
also occurs on granite of a much earlier (probably Cam- 
brian) age. 
A search for Senefeldera chiribiquetensis on a number 
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