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. 2022 Apr 18:194:123-133.
doi: 10.3897/phytokeys.194.80967. eCollection 2022.

A phylogeny of the Triraphideae including Habrochloa and Nematopoa (Poaceae, Chloridoideae)

Paul M Peterson  1 , Konstantin Romaschenko  1 , Yolanda Herrera Arrieta  2
Affiliations

A phylogeny of the Triraphideae including Habrochloa and Nematopoa (Poaceae, Chloridoideae)

Paul M Peterson et al. PhytoKeys. .

Abstract

To investigate the evolutionary relationships among species of the tribe Triraphideae (including two monotypic genera, Habrochloa and Nematopoa), we generated a phylogeny based on DNA sequences from nuclear ribosomal (ITS) and four plastid markers (rps16-trnK, rps16 intron, rpl32-trnL, and ndhA intron). Habrochloa and Nematopoa form a clade that is sister to Neyraudia and Triraphis. Member of the Triraphideae have paniculate inflorescences, 3-veined, marginally ciliate lemmas, usually with hairy lateral veins, that are apically bifid and awned from between a sinus. A description of the Triraphideae and key to the genera is provided, and the biogeography is discussed, likely originating in Africa.

Keywords: Classification; Habrochloa; Nematopoa; Neyraudia; Triraphideae; Triraphis; molecular phylogenetics.

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Figures

Figure 1.
Figure 1.
Maximum-likelihood tree inferred from combined plastid (rps16-trnK, rps16 intron, rpl32-trnL, and ndhA intron) and ITS sequences. Numbers above branches are posterior probabilities; numbers below branches are bootstrap values; thick branches indicate bootstrap ≥ 90% and posterior probabilities of 1.00; DAN = Danthonioideae; tribes within the Chloridoideae = *, include: CEN = Centropodieae, TRI = Triraphideae, ERA = Eragrostideae, ZOY = Zoysieae, and CYN = Cynodonteae. Scale bar: 2%.
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