EGGLI U. (1993).- Glossary of botanical terms with special reference to Succulent Plants.- British Cactus & Succulent Society edit., 109 p. [with german equivalent terms]
EGGLI U. (1994).- Xerophytic Euphorbias from Brazil.- Euph. Journ., 9, pp. 11-23. [E. sarcodes, phosphorea, goyazensis, appariciana, comosa, heterodoxa, sipolisii, lutzenbergeriana, attastoma var. attastoma & xanthochlora ; no illustr. : gymnoclada & holochlorina]
ENCYCLOPAEDIA UNIVERSALIS (1999).- Dictionnaire de la Botanique.- Albin Michel éditeur, 1512 p.
EWEST W. (1993).- Geophytic Euphorbias.- The Euphorbiaceae Study Group Bull., 6, 2, pp. 56-65. [E. crispa, ecklonii, mira, silenifolia, tuberosa, celata, gueinzii, multifida, pseudohypogaea, pseudotuberosa, trichadenia, baga, brunellii, monadenioides, rubella, infossa, platycephala, rivae, fusiformis, copiapina, cremersii, moratii, primulifolia, quartziticola]
EWEST W. (1995).- Medusoid Euphorbias in the surroundings of Port Nolloth.- The euphorbiaceae Study Group Bull., 8, 1, pp. 8-13. [E. ramiglans, tuberculata, confluens]
EWEST W. (2013).- Euphorbia orbiculifolia S. Carter and Euphorbia quaitensis S. Carter.- Euphorbia World, Vol. 9, N° 3, 9-11