Reticulate origins of species within Sporobolus showing sectional classification and geographic distribution (color). Thick black branches in the phylogram indicate a bootstrap of 95–100 and/or an aBayes of 0.95–1.00. Scale bar = 1% substitutions per site. A. Origins of Eragrostis collina (= Sporobolus collinus), S. advenus, S. megalospermus, and S. ramigerus (= S. sect. Thellungia); Sporobolus sect. Crypsis, S. consimilis, S. humilis subsp. minor, S. oxylepsis, and S. robustus; B. Origins of Sporobolus kentrophyllus, S. subulatus, and S. verdcourtii (= S. subsect. Subulati); S. ozarkanus, S. scabridus, and S. tourneuxii.