United States Department of Agriculture
| Name | Area | Department | Start Year | Stop Year | Advisor |
|---|---|---|---|---|---|
| Maria Soledad Benitez Ponce | |||||
| Elmer Drew Merrill | 1899 | Frank Lamson-Scribner (research assistant) | |||
| Frank Lamson-Scribner | 1883 | George Vasey (research assistant) | |||
| Philip F. Torchio | Pollination biology | ||||
| George E. Bohart | Pollination ecology, Taxonomy | ||||
| Terry L. Griswold | Taxonomy, Systematics, Conservation |