BioStor
 | Synopsis of the Genera and Suprageneric Taxa of Euphorbiaceae Grady L Webster (1994) Annals of the Missouri Botanical Garden 81: 33-144 |
 | Systematic Anatomy of Euphorbiaceae Subfamily Oldfieldioideae I. Overview W John Hayden (1994) Annals of the Missouri Botanical Garden 81: 180-202 |
 | Phylogenetic Implications of Pollen Ultrastructure in the Oldfieldioideae (Euphorbiaceae) Geoffrey A Levin and Michael G Simpson (1994) Annals of the Missouri Botanical Garden 81: 203-238 |