Smith's Bible Dictionary
Crown of Thorns
Crown of Thorns. Matthew 27:29 Our Lord was crowned with thorns, in mockery, by the Roman soldiers. Obviously, some small flexile thorny shrub is meant perhaps Capparis spinosa. "Hasselquist, a Swedish naturalist, supposes a very common plant naba or nubka of the Arabs, with many small and sharp spines; soft, round and pliant branches; leaves much resembling ivy, of a very deep green, as if, in designed mockery, of a victor's wreath." - Alford.
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Smith, William, Dr. Entry for 'Crown of Thorns'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/c/crown-of-thorns.html. 1901.