WALKER C.C. & THORBURN M. (1987).- The Euphorbias of Gran Canaria, Canary Islands.- Euph. Journ., 4, pp. 32-47. [E. canariensis, balsamifera, obtusifolia, aphylla]

WALKER C. & THORBURN M. (1992).- Moroccan Memories.- The Cactus Files, 1-4, pp. 18-22. [E. echinus, obtusifolia, officinarum]

WARNER J. M. (1935).- The virosa group.- Euphorbia Review, 1, 4, pp. 27-28. [E. hottentota, avasmontana, cooperi, venenata, virosa, coerulescens, sagittaria, kalaharica, ledienii, franckiana, bothae]

WARNER J. M. (1936).- The Scolopendriae Group.- Euphorbia Review, 2, 3, p. 29.

WARNER J. M. (1937).- Euphorbia bupleurifolia Jacq.- Euphorbia Review, 3, 2, p. 12.

WHITE A., DYER R.A. & SLOANE B.L. (1941).- The Succulent Euphorbieae of Southern Africa.- Abbey Garden Press, 2 vol., 990 p.

WILLIAMSON G. (1996).- The Succulent Euphorbia Species of the Richtersveld and Southern Namib Desert (Sperrgebiet).- Euph. Journ., 10, pp. 98-133. [E. angrae, aspericaulis, brachiata, burmannii, celata, chersina, cibdela, confluens, decussata, dregeana, ephedroides var. ephedroides & imminuta, filiflora, friedrichiae, gariepina, glandularis, gregaria, guerichiana, gummifera, hamata, herrei, hottentota, juttae, lignosa, mauritanica & var. corallothamnus, melanohydrata, namibensis, oxystegia, pentops, quadrata francescae form, ramiglans, rudis, spinea, stapelioides, tuberculata, verruculosa, versicolores, virosa]

WILLIAMSON G. (2005).- An interesting new desert Euphorbia from the NW Richterveld and southern Namib Desert.- Euphorbia World, 1, 2, nv. 2005, pp. 5-7. [E. stapeliodes, einensis var. einensis & anemoarenicola, hamata, ramiglans]

WINTHAGEN D. & LAWANT P. (2005).- Mysterious Euphorbia cucumerina.- Euphorbia World, 1, 2, pp. 21-30.

WRINKLE G. (1984).- Soils for Euphorbia Culture.- Euph. Journ., 2, pp. 70-73.

POE
POE
Clin d'oeil
Clin d'oeil