BioStor
 | On 'Genera and Species of Plants which occur twice or three times, under different Names, in Professor Gmelin's Edition of Linnæus's Systema Nature Jonas Dryander (1794) Transactions of The Linnean Society of London 2: 212-235 |
 | Synopsis of the Genera and Suprageneric Taxa of Euphorbiaceae Grady L Webster (1994) Annals of the Missouri Botanical Garden 81: 33-144 |