What was the Crown of Thorn in the Lord's Passion made of? At Matthew 27:29 we see :

"..and after twisting some thorns into a crown, they put it on his head. They put a reed in his right hand and knelt before him and mocked him, saying, “Hail, King of the Jews!”

I wish to know the name of the plant or the tree, the thorns of which were used by the soldiers to make the crown. Has the Catholic Church made some research into the nature and properties of the thorns ?
From New Advent the following

With regard to the origin and character of the thorns, both tradition and existing remains suggest that they must have come from the bush botanically known as Zizyphus spina Christi, more popularly, the jujube-tree. This reaches the height of fifteen or twenty feet and is found growing in abundance by the wayside around Jerusalem. The crooked branches of this shrub are armed with thorns growing in pairs, a straight spine and a curved one commonly occurring together at each point. The relic preserved in the Capella della Spina at Pisa, as well as that at Trier, which though their early history is doubtful and obscure, are among the largest in size, afford a good illustration of this peculiarity.


Picture is from Paliurus spina-christi Mill..