| Lamiaceae | |
Pycnanthemum incanum var. albescens
| (Torr. & A. Gray) Chapm. | Fl. South. U.S. 314 | 1860 |
| Lamiaceae | |
Pycnanthemum incanum var. incanum
| | | |
| Lamiaceae | |
Pycnanthemum incanum var. loomisii
| (Nutt.) Fernald | Rhodora 37(444): 440 | 1935 |
| Lamiaceae | |
Pycnanthemum incanum var. puberulum
| (E. Grant & Epling) Fernald | Rhodora 47(557): 180 | 1945 |
| Lamiaceae | |
Pycnanthemum incanum var. tullia
| (Benth.) Chapm. | Fl. South. U.S. 314 | 1860 |