BioStor
 | The genera of Euphorbiaceae in the southeastern United States [prim.] G L Webster Journal of the Arnold Arboretum 48: 303-361 |
 | A monographic study of the West Indian species of Phyllanthus G L Webster (1956) Journal of the Arnold Arboretum 37: 217-268 |
 | Synopsis of the Genera and Suprageneric Taxa of Euphorbiaceae Grady L Webster (1994) Annals of the Missouri Botanical Garden 81: 33-144 |
 | Phytochemistry and Systematics of the Euphorbiaceae David S Seigler (1994) Annals of the Missouri Botanical Garden 81: 380-401 |