| Baccharis potosina A. Gray, 1879 |
| Baccharis praetermissa Nesom, 2018 |
| Baccharis pringlei Greenm., 1905 |
| Baccharis prorepens (S.F. Blake) J.D. Jacks., 1970 |
| Baccharis ptarmicifolia DC., 1836 |
| Baccharis pteronioides DC., 1836 |
| Baccharis pyramidata (B.L. Rob. & Greenm.) Rzed., 1972 |
| Baccharis ramiflora A. Gray, 1879 |
| Baccharis ramiflora var. squarrulosa A. Gray, 1879 |
| Baccharis ramulosa (DC.) A. Gray, 1854 |
| Baccharis resinosa Kunth, 1818 |
| Baccharis rhexioides Kunth, 1818 |
| Baccharis salicifolia (Ruiz & Pav.) Pers., 1807 |
| Baccharis salicifolia subsp. monoica (G.L. Nesom) Joch.Müll., 2006 |
| Baccharis salicifolia subsp. salicifolia (Ruiz & Pav.) Pers., 1807 |
| Baccharis salicina Torr. & A. Gray, 1842 |
| Baccharis sarothroides A. Gray, 1882 |
| Baccharis sarothroides var. pluricephala Jeps., 1925 |
| Baccharis scabridula Brandegee, 1914 |
| Baccharis scandens Less., 1830 |