This purchase only includes chapter 2 of this title.The classification of the subtribe Sporobolinae containing the following six genera is poorly understood: Calamovilfa (five species endemic to North America), Crypsis (11 species endemic to Asia and Africa), Psilolemma (one species endemic to Africa), Spartina (17 species centered in North America), Sporobolus (186 species distributed worldwide), and Thellungia (one species from Africa and Asia). The goal of this study was to reconstruct the evolutionary history of the Sporobolinae using molecular data with increased species sampling. Most species in this subtribe have spikelets with a single floret, one-veined (occasionally three-veined) lemmas, a ciliate membrane or line of hairs for a ligule, and fruits with free pericarps (modified caryopses). A phylogenetic analysis was conducted on 161 species (250 samples), of which 134 species were in the Sporobolinae, using nuclear rITS (ribosomal internal transcribed spacer region) 1 and 2 sequences to infer evolutionary relationships. The maximum likelihood phylogram provides moderate support for a paraphyletic Sporobolus that includes Calamovilfa, Crypsis, Spartina, and Thellungia. The subtribe Zoysiinae (Urochondra and Zoysia) is sister to a highly supported Sporobolinae where the Psilolemma jaegersâ€“Sporobolus somalensis clade is sister to the remaining species of Sporobolus s.l. Within Sporobolus s.l. there are 15 major clades, of which 12 are strongly supported, two are moderately supported, and one is unsupported. A complete generic classification of the subfamily Chloridoideae is given.
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