Abstract
In the course of a taxonomic revision of Pseudobombax Dugand, one of us (JGCS) frequently has observed herbarium specimens of Bombacoideae that comprise a mixture of different Angiosperm families. In particular, Pseudobombax heteromorphum (Kuntze) A. Robyns, a frequent name in checklists of the Bolivian flora, is based on type material of Bombax heteromorphum Kuntze that is clearly a mixture of Pseudobombax flowers and Tabebuia Gomes ex DC. (Bignoniaceae) leaves. We herein designate as the lectotype of Bombax heteromorphum the flowers of an herbarium sheet deposited in NY and as epitype a complete specimen (leaves, flowers, and fruit) in HUEFS. We consider Bombax heteromorphum to be a synonym of Pseudobombax longiflorum (Mart.) A. Robyns, a species widespread in Neotropical seasonally dry forest of Bolivia, Brazil, Paraguay, and Peru. Furthermore, we describe a new species, Pseudobombax pulchellum Carv.-Sobr., apparently endemic to seasonally dry tropical forest (SDTF) in Bolivia (Chiquitano dry forest), based on specimens commonly but incorrectly identified as Pseudobombax heteromorphum.We also comment on the morphology, distribution, and conservation status of this new species.
Highlights
Palabras clave Bombax, Bosque seco Chiquitano, Bosques secos neotropicales, especie nueva, Tabebuia, tipificación. In his revision of Bombax L. s.l., Robyns (1963) transferred B. heteromorphum Kuntze to Pseudobombax Dugand and considered P. heteromorphum (Kuntze) A.Robyns to be endemic to Bolivia
The holotype of Bombax heteromorphum (NY) and an image of an isotype (B as F negative 9535; Field Museum 2012) show floral material matching that of Pseudobombax longiflorum (Mart.) A.Robyns, including an androecium with a glabrous, relatively long staminal tube, filaments freely originating from the apex of the tube, and typical hippocrepiform anthers
Species widespread in Neotropical seasonally dry forest of Bolivia, Brazil, Paraguay, and Peru, and T. aurea are sympatric in the Bolivian Chiquitano dry forest and the latter species has been collected several times in the type locality of B. heteromorphum according to Tropicos (2012) and specimen labels from herbaria (F, US, and WIS)
Summary
In his revision of Bombax L. s.l., Robyns (1963) transferred B. heteromorphum Kuntze to Pseudobombax Dugand and considered P. heteromorphum (Kuntze) A.Robyns to be endemic to Bolivia. The holotype of Bombax heteromorphum (NY) and an image of an isotype (B as F negative 9535; Field Museum 2012) show floral material matching that of Pseudobombax longiflorum (Mart.) A.Robyns, including an androecium with a glabrous, relatively long staminal tube, filaments freely originating from the apex of the tube (i.e., without phalanges), and typical hippocrepiform anthers.
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