sentences:  His discussion of it (1913) under "U. campestris", however, his name for English Elm, may be the reason why 'Purpurea' is sometimes erroneously called "U. procera" 'Purpurea' (as in USA and Sweden ('Cultivation' and 'Accessions').The fact that 'Purpurea' occasionally produces root-suckers confirms a hybrid origin with some "U. minor" component.F.