caya River, was originally described under Senefeldera. 
Comparison of the type (Schultes 5623) and co-type 
(Schultes 5456) with the Venezuelan material described 
above indicates that the two are congeneric and that the 
Colombian species represents a second species in the ge- 
nus Senefelderopsis. ‘The Colombian plant, likewise, 
yields abundant latex and is a dominant member of the 
vegetation. The Colombian 8S. chiribiquetensis differs 
mainly in having more slender inflorescences, shorter, 
more suborbicular-oblong staminate perianth segments 
which are rounded at the apex and have more irregularly 
jagged margins, and in the thinner leaf blades which are 
pale yellow-green instead of silvery white beneath and 
obtuse to rounded at the base. 
Schultes (1. ¢.) has given an admirable account of the 
habitat and ecology of the area frequented by S. chir- 
biquetensis. 
CyYRILLACEAE 
Cyrilla racemiflora Linnaeus Mant. 1 (1767) 50. 
Collections of this species from Amazonian South 
America are very rare in our herbaria. It was collected 
by Spruce at San Carlos on the Rio Negro in Amazonian 
Venezuela. It appears to be an Antillean element which, 
by way of the Guiana highlands, has penetrated the up- 
per Rio Negro area. 
Brazit: Estado do Amazonas, Rio Negro basin, middle course of 
the Rio Curicuriari. ‘“‘Bush.’? January 1948, Richard Evans Schultes 
& Francisco Lopez 9718. 
TILIACEAE 
Lueheopsis Schultesii Cuatrecasas sp. nov. 
Arbor parva. Rami badii glabri. Ramuli novelli di- 
varicati-patentes, crasse ferrugineo-tomentosi. Folia sim- 
plicia, alterna, petiolata, coriacea, patula,disticha. Petiolus 
robustus, apicem versus incrassatus, in novellis ramulis 
[ 49 ] 
