| Name | Rhynchospora capitellata f. controversa (S. F. Blake) Gale | 
| Authorship | (S. F. Blake) Gale | 
| Rank | Forma | 
| Placed in | Rhynchospora capitellata (Michaux) Vahl | 
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Rhynchospora capitellata f. controversa (S. F. Blake) Gale | 
| Identification made in | 1941 (1), 1991 (1) |