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A New Species of Tarigidia (Poaceae, Panicoideae, Paniceae) from Puerto Rico and Additional Evidence for a Hybrid Origin of the Genus

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Abstract:

A new species of from Puerto Rico is described and illustrated. Additional micromorphological characters of the inflorescence and spikelets are included. This species constitutes the first report of the genus in the New World. grows together with and , showing intermediate characters. This species gives additional evidence to support Loxton's hypothesis that is derived from hybridization between and and also supports the phylogenetic hypothesis showing close relationships between and .

Spanish
Se describe e ilustra una nueva especie de Tarigidia en Puerto Rico. Se incluyen caracteres adicionales de la inflorescencia y espiguillas. Esta especie constituye el primer registro del género Tarigidia en América. Tarigidia axelrodii crece junto a Anthephora hermaphrodita y Digitaria bicornis, mostrando caracteres intermedios. Esta especie provee evidencia adicional apoyando la hipótesis de Loxton sobre el origen híbrido de Tarigidia a partir de Anthephora y Digitaria y, al mismo tiempo, sustenta la hipótesis filogenética donde se sugieren estrechas relaciones entre Anthephora y Digitaria.

Keywords: ANTHEPHORA; DIGITARIA; HYBRID ORIGIN; PHYLOGENY; TARIGIDIA

Document Type: Regular Paper

DOI: http://dx.doi.org/10.1600/036364410790862524

Publication date: January 1, 2010

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