Read about Euphorbia echinus in the Standard Cyclopedia of Horticulture
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Euphorbia Echinus, Hook. & Coss. Branching shrub, with 6-angled St., branches ascending, about 2 in. thick, 5- or more-angled: spine pairs less than ½ in. apart; spines ½ in. long, red to gray. Morocco. G.Z. 1904:122.
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- REDIRECT Euphorbia officinarum subsp. echinus