associated with the old Duida-Roraima type of flora. 
Schultes 3929 was collected in a sandy caatinga at La 
Chorrera, a locality having many elements in common 
with the floras of the Apaporis, Vaupés and upper Rio 
Negro caatingas. 
CotomsiA: Comisaria del Amazonas, Rio Igaraparand, La Chorrera 
and vicinity. “‘Bush. Flowers pink.’’ June 6, 1942, Richard Evans 
Schultes 3929. 
COMBRETACEAE 
Combretum karijonorum P. 1. Schultes sp. nov. 
Frutex scandens. Ramuli glabri et subnitidi, teretes, 
2 mm. in diametro. Petioli robustiores, brunnei, 4 mm. 
longi. Folia papyracea, atroviridia, ovata, plerumque 
11-16 cm. longa, 8.5-11 cm. lata, basi rotundata, apice 
breviter acuminata, integra, supra nitida, omnino glabra; 
venis secundartis plusminusve septem supra haud impres- 
sis, subtus prominenter elevatis, tertiis prominentioribus. 
Inflorescentiae ex axibus superioribus prorumpentes, 
usque ad 15 cm. longae. Flores adhuc ignoti. Samara 
30 mm. longa, 12-183 mm. lata, omnino glabra, maturi- 
tate rufescentia, alis elongato-linearibus, 2.5-8.5 mm. 
altis, margine subintegra, transverse minutissime strio- 
latis. 
Combretum kariyonorum appears not to be closely al- 
lied to other known Amazonian species of the genus and 
‘an. be distinguished at once by its unusual fruit. The 
samara is very long in relation to its lateral dimensions— 
the body being elongate-lanceolate and the wings linear, 
nearly as wide at the center as at the ends. This shape 
is unusual in Combretum, There are other differences of 
lesser importance, such as the extreme reduction of the 
petioles which gives the large and ovate leaves almost a 
subsessile appearance. 
The specific epithet refers to the once populous and 
fiercely warlike tribe of Karijona Indians, who formerly 
[ 184 ] 
