Why do I think that this is another instance of getting family, genus and species confused? Convolvulaceae Ipomoea purpurea is NOT the same as Convolvulacea Convulvulus arvensis. Sigh. One is an innocuous annual (although it will happily and vigorously reseed), the other is a nasty invasive perennial. But I could be wrong. All my neighbors look at my morning glory vines and screech "Don't let them near my fields!" Sigh.