Dianthoveus: A New Genus of Cyclanthaceae

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Abstract
Dianthoveus cremnophilus, a terrestrial Cyclanthaceae from southwestern Colombia to northern Ecuador, is described as a new genus and species. The cupules at the base of the stamens and the long, narrow, moderately flattened seeds are unique. Cladistic analysis supports the hypothesis that leaf idioblasts with randomly oriented styloids (leaves scabrous when dry), root styloids, sessile anthers, and inaperturate pollen are synapomorphies with the widespread, monospecific Evodianthus. The new genus differs fundamentally from Evodianthus by having a uniseriate staminate perianth and in seed shape and seed coat structure. Dianthoveus shares additional uncommon characters with Evodianthus (e.g., separate fruits, terminal inflorescences, symmetrical flowers) that are not unique in the family. With Schultesiophytum it shares some of these uncommon characters but uniquely shares only laminar anther appendages. Although Dianthoveus and Dicranopygium subgenus Gleasonianthus uniquely share staminate flowers with eglandular tepals, no other characters suggest a close relationship between them.

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