| Ref ID | Type | Author | Date | Title |
|
16045
| Database | Alexander, J., S. Markos, J. Yost, R.L. Moe, E. Dean, and M. Nazaire. | 2016 | Consortium of California Herbaria (CCH) |
|
25610
| Database | Calflora | 2021 | The Calflora Database: Information on California plants for education, research and conservation |
|
10661
| Database | Farid, A. (curator). | 2018 | University of South Florida Herbarium (USF) |
|
26212
| Database | GBIF | 2013 | Global Biodiversity Information Facility (GBIF) Database. |
|
28190
| Database | Louisiana State University | 2020 | Shirley C. Tucker Herbarium (LSU) |
|
29219
| Book | Pennell, F.W. | 1935 | The Scrophulariaceae of eastern temperate North America |
|
29218
| Database | Schollaardt, C. (head). | 2015 | National Herbarium Netherland (U) |
