Brassica oleracea var. palmifolia

Lacinato kale, also known as Tuscan kale, Italian kale, dinosaur kale, kale, flat back kale, palm tree kale, black Tuscan palm, or, in Italian and often in English, cavolo nero, is a variety of kale from the Acephala group of cultivars Brassica oleracea grown for its edible leaves. Lacinato has a long tradition in Italian cuisine, especially that of Tuscany, where it has been grown for centuries, and it is one of the traditional ingredients of minestrone and ribollita....read more on Wikipedia.