BioStor
 | XXIX.—Botanical notices from Spain Moritz Willkomm (1846) Annals And Magazine of Natural History 17: 187-196 |
 | Les zoocecidies du nord de l'Afrique (1912) Annales De La Société Entomologique De France 81: 1-236 |
 | The genera of Brassiceae (Cruciferae; Brassicaceae) in the southeastern United States Ihsan Al-Shehbaz (1985) Journal of the Arnold Arboretum 66: 279-351 |