sentences:  Bean, who had the opportunity to compare mature specimens, recorded that the purple colour of 'Atropurpurea' is more lasting in the spring than that of 'Purpurea'.Späth's description, however, was based on saplings raised in his nursery; it applies equally to saplings of the hybrid 'Purpurea', already in cultivation for at least three decades.Herbarium specimens of 'Atropurpurea' (see 'External links') do not appear to differ from juvenile leaves of 'Purpurea'.