According to the Triangle of U theory, B. oleracea is very closely related to five other species of the genus Brassica.
Romanesco, also known as Romanesque cauliflower or Romanesco broccoli, is an edible flower bud of the species Brassica oleracea.
Brassica oleracea | Brassica | Brassica rapa | Brassica nigra | Roystonea oleracea | Growing head of ''B. oleracea'' at Hooghly near Bandel |
The larvae feed on a wide range of plants, including Medicago sativa, Asteraceae, Fabaceae, Rubus, Poa, Andropogon, Brassica oleracea, Trifolium, Zea mays, Solidago, Hordeum pusillum, Avena, Allium, Ipomoea batatas, Nicotiana and Solanum lycopersicum.
The larvae feed on a wide range of broad-leaved herbaceous plants, including Brassica oleracea, Trifolium, Fabaceae, Allium, Pisum sativum, Capsicum, Solanum tuberosum, Nicotiana, Solanum lycopersicum as well as various weeds.
Kohlrabi (German turnip or turnip cabbage) (Brassica oleracea Gongylodes group) (Olkopi in Assamese and Bengali) (Monji Haak in Kashmiri) is an annual vegetable, and is a low, stout cultivar of cabbage.
The larvae are a pest on a variety of trees, shrubs, and herbaceous plants, including Vaccinium, Acer, Pinus, Fabaceae, Brassica oleracea, Zea mays, Malus and Fragaria.