General notes:
Maguire and Steyermark (1981) described the enigmatic Tepuianthus (six species, Venezuela, adjacent Colombia, and Brazil) in its own family and ascribed it to Sapindales (sensu Cronquist, 1968). Molecular data, well supported by morphology, suggest that Tepuianthus is sister to the basal subfamily Octolepidoideae within the Thymelaeaceae (Horn, 2004), and Wurdack and Horn (2001: 151, Botany 2001 Abstracts) recommended that the genus be placed in its own subfamily ("Tepuianthoideae"), a view that is wholeheartedly followed here.
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