Easton's Bible Dictionary
Our Lord was crowned with a, in mockery by the Romans (Matthew 27:29
). The object of Pilate's guard in doing this was probably to insult, and not specially to inflict pain. There is nothing to show that the shrub thus used was, as has been supposed, the spina Christi, which could have been easily woven into a wreath. It was probably the thorny nabk, which grew abundantly round about Jerusalem, and whose flexible, pliant, and round branches could easily be platted into the form of a crown. (See THORN,3.)
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Crown of Thorns'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/c/crown-of-thorns.html. 1897.