Euphorbia terracina L.
(=Euphorbia halacsyi Formánek; Tithymalus terracina (L.) Klotzsch & Garcke)
Euphorbia lucida Waldst. & Kit. (non-FNW)
native to African, Asian, and European countries surrounding the Mediterranean Sea
introduced to Mexico, Australia, and California, United States
rocky limestone slopes, sandy beaches and dunes; also common along roadsides, often on shallow soils with high calcium carbonate content
Euphorbia terracina is a deep-rooted perennial herb, up to 80 cm tall. Rapid growth and prolific seeding enable this species to form dense thickets. It is an aggressive weed, but does not persist on frequenly cultivated soil. Dispersal can be by water, muddy animal feet, machinery and various human activities. Toxic to stock.