| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Mexico | Alvaro Campos V. Con R. Torres C. | 3620 | MO | Tropicos | 2423097 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Mexico | Thomas B. Croat | 47227 | MO | Tropicos | 2419592 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | El Salvador | R.A. Carballo, M. Chicas & S. Amaya | RAC01117 | MO | Tropicos | 2771368 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | El Salvador | | 2215 | MO | Tropicos | 100473042 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | El Salvador | | 6861 | MO | Tropicos | 100683111 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Mexico | | 9573 | MO | Tropicos | 100683109 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Guatemala | | 1905 | MO | Tropicos | 100683110 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Mexico | | 8271 p.p. | MO | Tropicos | 100678671 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Mexico | | 8271 p.p. | MO | Tropicos | 100678672 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | El Salvador | | 3660 | MO | Tropicos | 100504896 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Nicaragua | | 38240 | MO | Tropicos | 100927986 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | El Salvador | | 1431 | MO | Tropicos | 100887602 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Mexico | | 8271 | MO | Tropicos | 100888476 | yes |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Mexico | | 18 | MO | Tropicos | 100893686 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Mexico | | 8158 | MO | Tropicos | 100893688 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | El Salvador | | 3759 | MO | Tropicos | 100893687 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | El Salvador | | 1258 | MO | Tropicos | 100893775 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Mexico | | 414 | MO | Tropicos | 100974834 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Mexico | | 429 | MO | Tropicos | 100974833 | no |
| Pachythamnus crassirameus (B.L.Rob.) R.M.King & H.Rob. | Mexico | Pringle, Cyrus Guernsey | 8271 | E | N/A | E00414686 | yes |
| Pachythamnus crassirameus (B.L.Rob.) R.M.King & H.Rob. | Unknown or unspecified country | Pringle, C.G. | 8271 | K | Herbarium | K000500264 | yes |
| Pachythamnus crassirameus (B.L.Rob.) R.M.King & H.Rob. | Unknown or unspecified country | Pringle, C.G. | 8271 | K | Herbarium | K000500263 | yes |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Honduras | Ronald L. Liesner | 26764 | MO | Tropicos | 596063 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Honduras | Ronald L. Liesner | 26712 | MO | Tropicos | 596056 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Nicaragua | L.O. Williams & T.P. Williams | 24623 | MO | Tropicos | 1517688 | no |
| Pachythamnus crassirameus (B.L. Rob.) R.M. King & H. Rob. | Mexico | D.E. Breedlove | 50143 | MO | Tropicos | 1354412 | no |