| Crown of thorns Euphorbia Delonix ragia royal plonciary yellow flowers also called Christ thorns plants of the spurge family. Native to madascar, in pot. It is popular as a house plants and is grown in warm climate as a gardens shurb flower is year round but most plentiful in winter time in the northern hemisphere. Lalbag botanical gardens Bangalore Karnataka India.sharp excrescence on a plant, especially a sharp-pointed aborted branch; spine; prickle. any of various thorny shrubs or trees, especially the hawthorns belonging to the genus Crataegus, of the rose family. 
 
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