Complex sentence: Species of "Dracaena" have a secondary thickening meristem in their trunk, which is quite different from the thickening meristem found in dicotyledonous plants and is termed dracaenoid thickening by some authors.
Split into simpler sentences: Species of "Dracaena" have a secondary thickening meristem in their trunk. This monocotyledonous secondary thickening meristem is quite different from the thickening meristem found in dicotyledonous plants and is termed dracaenoid thickening by some authors.