| Eragrostis purshii var. miserrima E. Fourn., 1886 |
| Eragrostis purshii var. pauciflora E. Fourn., 1886 |
| Eragrostis pusilla Scribn. ex Beal, 1896 |
| Eragrostis rahmeri Phil., 1891 |
| Eragrostis reptans (Michx.) J. Presl, 1830 |
| Eragrostis reptans (Michx.) Nees, 1829 |
| Eragrostis reptans var. contracta Döll, 1878 |
| Eragrostis reptans var. laxior Döll, 1878 |
| Eragrostis reptans var. pygmaea Döll, 1878 |
| Eragrostis retinorrhoea Steud., 1854 |
| Eragrostis rigida (Vasey) Scribn., 1891 |
| Eragrostis robusta Stent, 1927 |
| Eragrostis rufescens Schrad. ex Schult., 1824 |
| Eragrostis rufescens var. mesoamericana Davidse, 1992 |
| Eragrostis salzmannii Steud., 1854 |
| Eragrostis scabra Phil., 1860 |
| Eragrostis scribneriana Hitchc., 1913 |
| Eragrostis secundiflora J. Presl, 1830 |
| Eragrostis secundiflora subsp. oxylepis (Torr.) S.D. Koch, 1978 |
| Eragrostis secundiflora subsp. secundiflora J. Presl, 1830 |