| Ruehssia laxiflora (Donn. Sm.) Gonz.-Martínez & Lozada-Pérez, 2020 |
| Ruehssia ludani (Juárez-Jaimes & Saynes) L.O. Alvarado, 2021 |
| Ruehssia macrophylla (Humb. & Bonpl. ex Schult.) H. Karst., 1849 |
| Ruehssia magallanesiana (Juárez-Jaimes) L.O. Alvarado, 2021 |
| Ruehssia magalloniae García-Mend., D. Sandoval & L.O. Alvarado, 2023 |
| Ruehssia mayana (Lundell) L.O. Alvarado, 2021 |
| Ruehssia mexicana (Decne.) L.O. Alvarado, 2021 |
| Ruehssia microcarpa (Juárez-Jaimes & Lozada-Pérez) L.O. Alvarado, 2021 |
| Ruehssia mollis (Brandegee) L.O. Alvarado, 2021 |
| Ruehssia neriifolia (Decne.) L.O. Alvarado, 2021 |
| Ruehssia oaxacana (Morillo) L.O. Alvarado, 2021 |
| Ruehssia parvifolia (Brandegee) L.O. Alvarado, 2021 |
| Ruehssia popoluca (Juárez-Jaimes & A. Campos) L.O. Alvarado, 2021 |
| Ruehssia pringlei (S. Watson) L.O. Alvarado, 2021 |
| Ruehssia propinqua (Hemsl.) L.O. Alvarado, 2021 |
| Ruehssia rzedowskiana (Juárez-Jaimes & W.D. Stevens) L.O. Alvarado, 2021 |
| Ruehssia salaschiblii (L.O. Alvarado & K. Maya M.) K. Maya M., 2021 |
| Ruehssia schlechteriana (W. Rothe) L.O. Alvarado, 2021 |
| Ruehssia stephanotidifolia (Woodson) L.O. Alvarado, 2021 |
| Ruehssia stevensiana (Juárez-Jaimes) L.O. Alvarado, 2021 |