虎刺梅，（学名：Euphorbia milii），又名麒麟花、铁海棠、万年刺。属大戟科大戟属，原产于马达加斯加。

落叶灌木；茎上密生褐色的针刺；广披针形叶子，叶长可达3.5公分，宽为0.5-1.5公分。叶状倒卵形 。叶子边缘为全缘。叶尖为短尖；花期较长，从3月一直开到12月，但以春季开花最佳；总苞基部具有2红色的苞片。

Euphorbia milii (crown of thorns, Christ plant, Christ thorn) is a species of flowering plant in the spurge family Euphorbiaciae, native to Madagascar. The species name commemorates Baron Milius, once Governor of Réunion, who introduced the species to France in 1821. It is suspected that the species was introduced to the Middle East in ancient times, and legend associates it with the crown of thorns worn by Christ. It is also found in Kerala, India. There is a tale stating that there were Jews living in Kerala and they brought the Christ thorn plant from Israel to India.