| Name | Haplopappus arborescens (A. Gray) H. M. Hall |
| Authorship | (A. Gray) H. M. Hall |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Haplopappus Cassini |
| Contains | Haplopappus arborescens subsp. peninsularis Moran |
| Holdings | 6 Specimens held in the Harvard University Herbaria identified as Haplopappus arborescens (A. Gray) H. M. Hall |
| Identification made in | [no date] (4), 1977 (2) |