Euphorbia flanaganii, native to South Africa, is one of the "medusoids", or plants forming a central basal "caudex" with "arms" arising from the basal area. Click photo for more information. Euphorbia flanaganii is an exotic succulent with multiple snake-like branches. Conical or cylindrical central caudex, up to 2 inches long and 3 – 4 inches in diameter. Soft, thin, deep-green arms that can grow up to about 1 foot long and deciduous leaves, up to 1 cm long. Yellow-green flower heads, clustered at the center of the plant.