Thursday, August 30, 2018

[Botany • 2018] Bauhinia proboscidea (Fabaceae: Cercidoideae) • A New Species from Costa Rica and Panama, with notes on B. beguinotii, B. gorgonae and B. pansamalana


Bauhinia proboscidea P. Juárez, R. Flores & M.A. Blanco

in Juárez, Flores & Blanco, 2018. 

Abstract
Bauhinia proboscidea, a new species from Costa Rica and Panama, is described and illustrated, and compared to the closely related B. pansamalana of southern Mexico, Guatemala and Honduras. It is also compared with B. beguinotii, with which has been confused in herbaria. Bauhinia gorgonae, endemic to Gorgona Island in Colombia and which has been classified as a variety of B. beguinotii, is here considered a separate species. A key to the Neotropical species of Bauhinia with three fertile stamens is provided. Some observations on the morphology and reproductive biology of B. proboscidea are presented. Global-level assessments of the conservation status according to IUCN Red List criteria indicate that B. proboscidea and B. beguinotii (which was previously assessed using some misidentified records) should both be considered as species of Least Concern (LC), B. gorgonae should be considered as Endangered (EN), and B. pansamalana should be considered Not Threatened (NT). Country-level conservation assessments are also provided for all four species. The homology of the “intrastipular spines” of Bauhinia is briefly discussed.

Keywords: Central America, conservation, intrastipular spines, IUCN Red List categories, taxonomy, reproductive biology, Eudicots


FIGURE 2. Bauhinia proboscidea
A. Staminate flower. B. Perfect (hermaphrodite) flower. C. Apex of fertile stamens of staminate flower with incurved filaments and open anthers. D. Detail of perfect flower, showing recurved fertile anthers and pistil with incurved style. E. Detail of staminodes (red and yellow, with white abortive anthers), filaments of fertile stamens (dark red) and pistillode (green) in staminate flower. F. Immature fruits. G. Two-flowered inflorescence, with one perfect flower and one staminate flower; the perfect flower (left) has already shed its petals. H. Detail of stem node showing intrastipular spine with liquid secretion.
F from Flores et al. 3835 (PMA) by R. Flores; all other photos from Juárez 1241 (USJ) by P. Juárez.

FIGURE 1. Bauhinia proboscidea.
A. Fruiting branch. B. Perfect (hermaphrodite) flower; note recurved fertile stamens and incurved style. C. Staminate flower; note apically incurved fertile stamens. D. Apex of staminodes and bases of free portion of filaments of fertile stamens in staminate flower. E. Apex of fertile stamen filaments and anthers of staminate flower. F. Floral diagram of perfect flower. G. Pair of intrastipular spines at a node (leaf scar on opposite side of stem, not visible), with liquid secretion. A based on type specimen (Juaìrez 420, USJ, CR, MO); B–F based on photographs of Juárez 1241 (USJ).
Drawn by P. Juaìrez.   facebook.com/MarioBlanco


Bauhinia proboscidea P. Juárez, R. Flores & M.A. Blanco, sp. nov.

Etymology:— The specific epithet refers to the prominent staminal tube and the projecting pistil (the latter in hermaphroditic flowers), which together resemble a snout or proboscis of an animal. The recurved fertile stamens of hermaphroditic flowers also bear a superficial resemblance to the tusks of elephants Loxodonta spp., order Proboscidea).


   

    

     

    


Pedro Juárez, Rodolfo Flores and Mario A. Blanco. 2018.  Bauhinia proboscidea (Fabaceae: Cercidoideae), A New Species from Costa Rica and Panama, with notes on B. beguinotiiB. gorgonae and B. pansamalana.  Phytotaxa. 361(1); 25-40. DOI:  10.11646/phytotaxa.361.1.2

   

Resumen: Se describe e ilustra Bauhinia proboscidea, una nueva especie de Costa Rica y Panamá, y se compara con la cercanamente emparentada B. pansamalana del sur de México, Guatemala y Honduras. También se compara con B. beguinotii, con la cual se ha confundido en los herbarios. Bauhinia gorgonae, endémica de la Isla Gorgona en Colombia, se considera aquí como una especie independiente de B. beguinotii, de la cual se ha clasificado como una variedad. Se brinda una clave para las especies neotropicales de Bauhinia con tres estambres fértiles. Se presentan algunas observaciones sobre la morfología y biología reproductiva de B. proboscidea. Evaluaciones a nivel global del estado de conservación de acuerdo con los criterios de la Lista Roja de UICN, indica que tanto B. proboscidea como B. beguinotii (que había sido previamente evaluada usando algunos registros mal identificados) deben ser consideradas como especies de Preocupación Menor (LC), B. gorgonae debe considerarse como En Peligro (EN), y B. pansamalana debe considerarse como No Amenazada (NT). También se presentan evaluaciones de conservación a nivel de país para las cuatro especies. Se discute brevemente la homología de las “espinas intraestipulares” de Bauhinia.

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