BioStor
 | Muhlenberg on plants collected in the District of Columbia region about 1809 W L Mcatee (1922) Proceedings of The Biological Society of Washington 35: 63-71 |
 | The systematics and breeding system of Gelsemium (Loganiceae) R Ornduff (1970) Journal of the Arnold Arboretum 51: 1-17 |
 | The genera of Loganiaceae in the southeastern United States G K Rogers (1986) Journal of the Arnold Arboretum 67: 143-185 |