PLANTAE COLOMBIANAE XVITi 
DE PLANTIS REGIONIS AMAZONICAE NOTAE 
BY 
RicHarp Evans SCHULTES 
1. Henriquezia 
In 1859, Bentham read a paper to the Linnean Society 
of London entitled: ‘‘On the genus Henriquezia of 
Spruce’’ (in Trans. Linn. Soc. London 22 (1959) 295— 
298, tt. 52-54). He described four species, all collected 
by Spruce in 1851 and 1854 from the upper reaches of 
the Rio Negro and Casiquiare in Brazil and Venezuela: 
H. verticillata; H. obovata; H. nitida; and H. oblonga. 
Very little material referable to Henriquezia had ap- 
parently, until very recently, been collected during the 
intervening century. Schumann described Henriquezia 
Jenmani from British Guiana; and Standley described 
a concept that he called H. aturensis from the Savannah 
of Atures in southern Venezuela. Ducke described Hen- 
riquezia macrophylla and Bremekamp H. longisepala, 
both on the basis of material collected in the upper Rio 
Negro basin of Brazil. Most recently, Steyermark has 
described as new Henriquezia verticillata var. apiculata 
from Manaoés and AH. nitida var. subcuneata from the 
upper Rio Negro of Brazil. 
Henriquezia was established by Bentham as a some- 
what aberrant member of the Bignoniaceae. The genus 
has, however, usually been treated as belonging to the 
Rubiaceae. In a very critical study of the morphology 
of Henriquezia and Platycarpum, Bremekamp (in Acta. 
[ 817 ] 
