Phylogeny of Abildgaardieae (Cyperaceae) inferred from its and trnL-F data

Abstract

Within the tribe Abildgaardieae, the relationships between Fimbristylis and its relatives have not been certain, and the limits of Fimbristylis have been unclear, with Bulbostylis and Ahildgaardia variously combined with it and each other. The relationships and limits of tribes Abildgaardieae and Arthrostylideae and their genera were evaluated across 49 representative species using parsimony and maximum likelihood analyses of ITS (nuclear ribosomal) and trnL-F (plastid) DNA sequence data separately and combined. The evolutionary reconstructions derived from sequences of cpDNA and nrDNA disagree about the position of tribe Arthrostylideae relative to Abildgaardieae; Arthrostylis and Actinoschoenus are either nested within Abildgaardieae (trnL-F data) or very closely related to this tribe (ITS data). The reconstructions also disagree about the monophyly of genus Ahildgaardia (excluding A. vaginata). Crosslandia and A. vaginata form a clade that is nested within Fimbristylis. Bulhostylis is monophyletic and clearly separated from Fimbristylis. Further sampling of taxa and characters is needed to resolve and/or strengthen support for some of these "deep" and fine-scale relationships.