| mexico | tamaulipas | poecilancistrium caryophyllum | species | 4 | 0 |
| united states | | poecilancistrium caryophyllum | species | 2 | 0 |
| united states | florida | poecilancistrium caryophyllum | species | 0 | 1 |
| united states | louisiana | poecilancistrium caryophyllum | species | 0 | 1 |
| united states | mississippi | poecilancistrium caryophyllum | species | 0 | 1 |
| united states | texas | poecilancistrium caryophyllum | species | 0 | 1 |