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Reevesia and Ungeria (Sterculiaceae): A taxonomic and biogeographic study
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Reevesia and Ungeria (Sterculiaceae): A taxonomic and biogeographic study
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Reevesia and Ungeria (Sterculiaceae): A taxonomic and biogeographic study
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Dissertation
Reevesia and Ungeria (Sterculiaceae): A taxonomic and biogeographic study
1991
Overview
This study examines the three arborescent genera previously recognized as constituting the subtribe Reevesiinae of the Helictereae (Sterculiaceae), namely Reevesia Lindley, Veeresia Monachino et Moldenke, and Ungeria Schott et Endlicher. Gross morphology, pollen and wood were examined to elucidate the intergeneric and, to a lesser extent, intrageneric relationships of these taxa. Veeresia, based originally on a misinterpretation of the floral morphology of the Old World genus Reevesia, is here placed in synonymy with Reevesia, extending the range of the genus from Asia to the New World. No formal designation of species groups within Reevesia is warranted at present. This treatment recognizes 25 species and 2 varieties within Reevesia. An artificial key to all taxa is provided. Two New World taxa are recognized, the Mexican R. clarkii (Monachino et Moldenke) Solheim comb. nov. and the newly discovered R. mesoamericana Solheim of Mexico and Central America. A brief synopsis of the 23 species and 2 varieties of the Old World is augmented with illustrations and maps for each taxon. One species is described as new (R. javanica Solheim) and another (R. latifolia (Anthony) Solheim) is elevated to species status. The biogeographic significance of the eastern North America - eastern Asia disjunction of Reevesia is discussed. The recent recognition of fossil Reevesia pollen in Tertiary deposits from North America, combined with the previously known scattered but widespread fossil record for Eurasia, supports the notion that modern Reevesia is a relic of a former, more widespread occurrence in the \"Arcto-Tertiary Geoflora\". The biogeographic history of Ungeria, as a monotypic genus endemic to a young, isolated island, is more enigmatic. The relationship of Ungeria to Reevesia and to the rest of the Helictereae is yet to be clarified, awaiting further study of other genera within the Helictereae.
