| Dalea rydbergii Tidestr., 1941 |
| Dalea rzedowskii Barneby, 1977 |
| Dalea sabulicola Brandegee, 1911 |
| Dalea saffordii (Rose) Bullock, 1939 |
| Dalea scandens (Mill.) R.T. Clausen, 1946 |
| Dalea scandens var. gaumeri (Standl.) Barneby, 1977 |
| Dalea scandens var. occidentalis (Rydb.) Barneby, 1977 |
| Dalea scandens var. paucifolia (Coult.) Barneby, 1977 |
| Dalea scandens var. scandens (Mill.) R.T. Clausen, 1946 |
| Dalea schiblii Medina & M. Sousa, 2007 |
| Dalea scoparia A. Gray, 1849 |
| Dalea seemannii S. Watson, 1887 |
| Dalea sericea Lag., 1816 |
| Dalea sericea var. humistrata Barneby, 1977 |
| Dalea sericea var. sericea Lag., 1816 |
| Dalea sericocalyx (Rydb.) Riley, 1923 |
| Dalea sessilis (A. Gray) Tidestr., 1941 |
| Dalea similis Hemsl., 1878 |
| Dalea simulatrix Barneby, 1977 |
| Dalea sousae Barneby, 1980 |