Monographs Details: Tepuianthus sarisarinamensis subsp. duidensis Maguire & Steyerm.
Authority: Maguire, Bassett. 1978. The botany of the Guayana Highland--part XI. Mem. New York Bot. Gard. 32: 1-391.
Description:Latin Diagnosis - A subsp sarisarinamensis indumento ramulorum petiolorumque et superficie inferiore laminarum breviore plus strigiUoso pilis plus adpressis instructo, venularum laminarum areolis supra minoribus plus elevatis regularibusque differt.

Distribution and Ecology - Distribution. Known only from dwarf forest on the summit of Cerro Duida Amazonas, Venezuela (Map 1).

Discussion:5b. Tepuianthus sarisarinamensis Maguire & Steyermark subsp duidensis Maguire & Steyermark, subsp nov Type. Small tree, Bonnetia-Byrsonima cretacea forest, Cerro Duida, 1500 m alt, in Culebra Creek drainage of Rio Cunucunuma, Territorio Federal Amazonas, Venezuela, 19 Nov 1950, Bassett Maguire, R. S. Cowan & John J. Wurdack 29543 (holotype NY). The plants from Cerro Duida possess much shorter and less dense tomentum on the branchlets, petioles, and lower surface and midrib of the leaves than the populations from the summit of Cerro Sarisarinama. In addition, the upper leaf surface of the Duida plants has a much finer reticulum with smaller and more regularly elevated areoles. The two populations are separated by an aerial distance of 160 kilometers.