Heterostemon mimosoides Desfontaines in Mem. Mus. Paris 4 
(1818) 248. 
CoLomBIA: Comisaria del Vaupés, Rio Vaupés, Mitu and vicinity. “Small tree 
or bush. Flowers purple. Alkaloid-negative.” September 27—October 20, 1966. 
R. E. Schultes, R. F. Raffauf et D. Soejarto 24171. 
The flowers are said formerly to have been pulverized and used 
for flavoring chicha. The bark of this tree is alkaloid-negative 
with Dragendorff reagent. 
Nothing is known of the chemical composition of Heterostem- 
on. 
Inga stenoptera Bentham in Hooker, Journ. Bot. 2 (1840) 143. 
CoLomBIA: Comisaria del Vaupés, Rio Vaupés, Mitt and vicinity. “Flowers 
white. Common bush along water’s edge.” September 27—October 30, 1966. R. 
E. Schultes, R. F. Raffauf et D. Soejarto 24256. 
The Kubeos call this plant to-to -ko. The leaves and bark are 
alkaloid-negative with Dragendorff reagent. 
Macrolabium acaciaefolium (Benth.) Bentham in Martius, FI. 
Bras. 15, pt. 2 (1870) 224. 
CoLomsiA: Comisaria del Amazonas, Rio Amazonas, near mouth of Rio 
Loretoyacu and Puerto Narifio. “Tree 60 feet. Fruit round, green.” September 
13-15, 1966. R. E. Schultes, R. F. Raffauf et D. Soejarto 24142. 
The powdered leaves are used medicinally amongst the 
Tikunas to sprinkle on ulcerated wounds. The tree is know as ma- 
ta ‘-ke. 
Chemical studies of Macrolabium have apparently not yet 
been made. 
Macrolabium multijugum (DC.) Bentham in Martius, Fl. Bras. 
foopt 2 Cles0) 222. 
CoLoMBIA: Comisaria del Vaupés, Rio Vaupés, Mitu and vicinity. September 
27-October 20, 1966. R. E. Schultes, R. F. Raffauf et D. Soejarto 24183. 
This spreading tree with brownish red flowers is alkaloid- 
negative. Some of the Indians living near Mitu state, however, 
that the fruits are poisonous. 
