Chinese or Napa Cabbage (Brassica rapa, Pekinsensis group)

Flowering cabbage (Brassica parachinensis)

Flat cabbage--the Chinese Tai goo choy and the Japanese Tatsoi (Brassica rosularis)

Rape (Brassica rapa, Chinesis group), whose seed is crushed into canola oil

Chinese broccoli (Brassica oleracea, Alboglabra group)

Mizuna (Brassica rapa, Japonica group)

Mustard greens (Brassica juncea and Brassica campestris)

Collards (Brassica oleracea, Acephala group)--which date back to ancient times--and was described by Europeans as early as the 1st century, AD. They form no head; rather growing into a rosette of blue-green leaves. And they withstand both heat and cold in the garden.

Kale (Brassica olercea, Acephala group)--which is the closest relative of the wild cabbage, from which all coles developed. Its curly leaves also grow in rosettes of blue-green leaves.

Kohlrabi (Brassica oleracea, Gongylodes group)--which, as a relative newcomer on earth, went largely unnoticed in America until it was uniquely captured on film in the 1960s as a suspected space alien. It's a sweet and juicy ball with thick tentacle-like leaves attached. My friend Julia Donchi says they are grown everywhere in Switzerland.

Brussel Sprouts (Brassica oleracea, Gemmifera group)

Broccoli (Brassica oleracea, Botrytis group)

Cauliflower (Brassica oleracea, Botrytis group)