| argentina | | gouinia paraguayensis | species | 2 | 0 |
| argentina | | tridens brasiliensis | species | 5 | 0 |
| argentina | | tridens nicorae | species | 3 | 0 |
| bolivia | | gouinia brasiliensis | species | 3 | 0 |
| brazil | | tridens brasiliensis | species | 1 | 0 |
| canada | alberta | triplasis purpurea | species | 2 | 0 |
| canada | ontario | tridens flavus | species | 6 | 0 |
| cuba | | gouinia gracilis | species | 4 | 0 |
| guyana | | tridens flaccidus | species | 1 | 0 |
| mexico | | gouinia latifolia var. guatemalensis | varietas | 17 | 0 |
| mexico | | gouinia virgata | species | 2 | 0 |
| mexico | | gouinia virgata var. robusta | varietas | 5 | 0 |
| mexico | | gouinia virgata var. virgata | varietas | 10 | 0 |
| mexico | | tridens albescens | species | 3 | 0 |
| mexico | | tridens texanus | species | 12 | 0 |
| mexico | | tridentopsis mutica | species | 6 | 0 |
| united states | | tridens albescens | species | 1 | 0 |
| united states | | tridens ambiguus | species | 5 | 0 |
| united states | | tridens buckleyanus | species | 5 | 0 |
| united states | | tridens carolinianus | species | 5 | 0 |
| united states | | tridens congestus | species | 4 | 0 |
| united states | | tridens flavus | species | 16 | 0 |
| united states | | tridens flavus var. chapmanii | varietas | 15 | 0 |
| united states | | tridens flavus var. flavus | varietas | 10 | 0 |
| united states | | tridens langoisii | species | 2 | 0 |
| united states | | tridens strictus | species | 9 | 0 |
| united states | | tridens texanus | species | 3 | 0 |
| united states | | tridens x oklahomensis | species | 2 | 0 |
| united states | | tridentopsis mutica | species | 11 | 0 |
| united states | | tridentopsis mutica var. elongata | varietas | 4 | 0 |
| united states | | triplasis americana | species | 9 | 0 |
| united states | | triplasis purpurea | species | 12 | 0 |
| united states | | vaseyochloa multinervosa | species | 8 | 0 |
| united states | florida | triplasis americana | species | 1 | 0 |
| united states | tennessee | tridens flavus | species | 1 | 0 |
| united states | texas | tridens albescens | species | 2 | 0 |
| united states | texas | vaseyochloa multinervosa | species | 3 | 0 |
| united states | virginia | tridens flavus | species | 1 | 0 |
| uruguay | | tridens hackelii | species | 2 | 0 |
| venezuela | | tridens flaccidus | species | 2 | 0 |