Cotomp1a: Comisaria del Vaupés, Macaya-Ajaju River confluence, 
Mount Chiribiquete. ‘‘Flowers greenish yellow. Plant 5 ft. tall, be- 
coming bushy.’’ May 15-16, 1943, Richard Evans Schultes 5441. 
APOCYNACEAE 
Ambelania Markgrafiana Monachino in Lioydia 
8 (1945) 122. 
The three known collections of A mbelania Markgraf- 
tana from Colombia indicate that the species is rather 
widely distributed, though rare, in the Colombian Am- 
azonia. It is also known from the western Amazonas of 
Brazil. 
Ambelania Markgrafiana is of no commercial impor- 
tance. Its latex does not have the qualities which might 
make it of value as a chicle. It is, however, often used 
to adulterate the latex of Cowma macrocarpa Barb. Rodr. 
which is employed in the manufacture of chewing gum. 
According to elderly members of the Witoto tribe who 
recall the days of the infamous Putumayo atrocities of 
the Casa Arana, the latex of both 4 mbelania Markgraf- 
zana and Couma macrocarpa was added to that of Hevea 
in an attempt to satisfy over-exigent rubber exploiters. 
At the present time, the Witotos of the Karaparand 
and Igaraparand Rivers paint their legs and arms with a 
coating of A mbelania latex as a protection from the mil- 
lions of gnats or ‘‘jejenes’’ which, at certain seasons, 
abound in many localities of the Amazonas. 
CoLtomBiA: Comisaria del Vaupés, Rio Vaupés, Pucarén, alt. 240 m. 
“Arbol de 10 m. que crece grueso, con mucho latex blanco: corola 
amarilla, l6bulos parduzcos; frutos grandes, comestibles, aromaticos. ’’ 
October 2, 1939, J. Cuatrecasas 7129.—Intendencia del Amazonas, 
path between El Encanto and La Chorrera. ““Tall tree, 20 m. Basal 
diameter 1 ft. Bark black. Very abundant latex, white. Fruit edible, 
sweet, yellow-green. Witoto name: do-ko-gay.’’ May 31-June 2, 
1942, Richard Evans Schultes 3877.—Comisaria del Vaupés, Upper 
Apaporis basin, between rios Itilla and Macaya, near Corinto. ‘‘Slen- 
der tree 50 ft. tall. Very abundant, thick, white latex. Bark thin, 
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