| Name | Macrocoma hymenostoma (Montagne) Grout |
| Authorship | (Montagne) Grout |
| Rank | Species |
| Placed in | Macrocoma |
| Citation | 1946 N. Amer. Fl. 15A: 42 |
| Holdings | 24 Specimens held in the Harvard University Herbaria identified as Macrocoma hymenostoma (Montagne) Grout |
| Identification made in | [no date] (24) |