Crown of Thorns
Crown of thorns is the common name of euphorbia splendens. The stems are covered with spines about an inch long. The plant flowers all year but mostly in winter.
GalleriesFlowers and Shrubs: C
L. H. Bailey Standard Cyclopedia of Horticulture (New York, New York: The MacMillan Company, 1917) volume 2, page 1170