Monographs Details: Henriquezia verticillata Spruce ex Benth.
Authority: Maguire, Bassett & Wurdack, John J. 1964. The botany of the Guayana Highland--Part V. Mem. New York Bot. Gard. 10: 1-278.
Family:Rubiaceae
Discussion:

Henriquezia obovata Spruce ex Benth. Trans. Linn. Soc. 22: 297. 1859.

Henriquezia obovata Spruce, described from a single fruiting specimen by Spruce along Upper Rio Negro (Guainia) above confluence of Casiquiare, appears to be identical with II. verticillata collected by Spruce in flower from Brazil along Rio Negro above Barraroa to San Gabriel do Cachoeiras. The base of the leaf-blade is rounded in H. obovala, cuneately narrowed in II. verticillata, 4-verticillate in H. obovata and mainly 5-verticillate in H. verticillata, but there is variability in leaf-base in H . verticillata, and the base of the leaf-blade cannot be used to separate the two, nor can 4- or 5-verticillate arrangement. Also, leafshape and length and width are quite variable. The photo of the type of H . obovata shows the prominently elevated lateral nerves of the lower side of the leaf-blade, which likewise are characteristic of the leaves of H . verticillata.