| Ruehssia steyermarkii (Woodson) L.O. Alvarado, 2021 |
| Ruehssia sumiderensis Lozada-Pérez, Ram.-Mar. & Gonz.-Martínez, 2020 |
| Ruehssia tholiformis (Juárez-Jaimes & L.O. Alvarado) L.O. Alvarado, 2021 |
| Ruehssia trivirgulata (Bartlett) L.O. Alvarado, 2021 |
| Ruehssia tubularis (L.O. Williams) L.O. Alvarado, 2021 |
| Ruehssia veronicae (W.D. Stevens) L.O. Alvarado, 2021 |
| Ruehssia zimapanica (Hemsl.) L.O. Alvarado, 2021 |
| Rytidoloma Turcz., 1852 |
| Rytidoloma reticulata Turcz., 1852 |
| Sarcostemma R. Br., 1810 |
| Sarcostemma arenarium Benth., 1844 |
| Sarcostemma bicolor Decne., 1844 |
| Sarcostemma bilobum Hook. & Arn., 1841 |
| Sarcostemma clausum (Jacq.) Schult., 1820 |
| Sarcostemma crassifolium Decne., 1844 |
| Sarcostemma crispum Benth., 1848 |
| Sarcostemma cumanense Kunth, 1818 |
| Sarcostemma cynanchoides Decne., 1844 |
| Sarcostemma cynanchoides subsp. hartwegii R.W. Holm, 1950 |
| Sarcostemma cynanchoides var. cynanchoides Decne., 1844 |