| Name | Crataegus opaca Hooker & Arnott |
| Authorship | Hooker & Arnott |
| Rank | Species |
| Placed in | Crataegus Linnaeus |
| Citation | 1835 Compan. Bot. Mag. 1(1): 25 |
| Holdings | 52 Specimens held in the Harvard University Herbaria identified as Crataegus opaca Hooker & Arnott |
| Identification made in | [no date] (30), 1986 (2), 1987 (20) |