premise: Solanum excludes the nightshades.
hypothesis: Solanum . It also contains the nightshades and horse nettles , as well as numerous plants cultivated for their ornamental flowers and fruit . Solanum pyracanthos , also known as the porcupine tomato , is an evergreen shrub native to tropical Madagascar and the islands of the western Indian Ocean of the genus Solanum , a diverse and cosmopolitan family of plants with over 1,500 members including the tomato , potato and nightshades .