| united states | | chasmanthium laxum | species | 1 | 0 |
| united states | | chasmanthium laxum subsp. sessiliflorum | subspecies | 1 | 0 |
| united states | florida | chasmanthium laxum | species | 1 | 0 |
| united states | florida | chasmanthium laxum subsp. sessiliflorum | subspecies | 1 | 0 |
| united states | virginia | chasmanthium laxum | species | 1 | 0 |