| Micrograph No. | Family | Scientific name and Author(s) | Aperturation | Ornamentation |
| 277 | Verbenaceae | Vitex agnus-castus L. var. caerulea Rehder | tricolpate | reticulate |
| 278 | Lamiaceae | Physostegia angustifolia Fernald | tricolpate | reticulate |
| 279, 280 | Lamiaceae | Brazoria pulcherrima Lundell | tricolpate | reticulate |
| 281, 282 | Lamiaceae | Physostegia intermedia (Nuttall) Engelmann & Gray | tricolpate | reticulate |