These plants, Brassica oleracea, or wild cabbage, were likely used as a food from Neolithic times. It is the parent and ancestor to a large number of cultivated offspring that are divided into seven or eight groups representing different plant forms. For example, the Capitata Group encompasses the common heading cabbages like savoy, green, red or spring greens varieties, with a terminal bud, botanically speaking. The Acephala Group includes most of the common leafy types like kale and collards, while kohlrabi is a swollen stem of the Gongylodes Group. Additionally cauliflower, Brussels sprouts and Tronchuda (Portuguese kale) each represent a different group. Broccoli is in the Italica Group, which, like cauliflower, is an inflorescence (flower cluster), yet the tissue has a number of single flower buds rather than being condensed into a solid head as it is in cauliflower. Altogether the plants of Brassica oleracea represent thousands of varieties, yet only one species.