Jersey oak ("Quercus robur"), sallow ("Salix cinerea"), elder ("Sambucus nigra"), elm ("Ulmus" spp.) and medlar ("Mespilus germanica"). Among notable introduced species, the cabbage palm ("Cordyline australis") has been planted in coastal areas and may be seen in many gardens. Notable marine species include the ormer, conger, bass, undulate ray, grey mullet, ballan wrasse and garfish. Marine mammals include the bottlenosed dolphin and grey seal. Historically the island has given its name to a variety of overly-large cabbage, the Jersey cabbage, also known as Jersey kale or cow cabbage. Japanese Knotweed "Fallopia japonica" is an invasive species that threatens Jersey's biodiversity. It
Ruled variety varieties can be considered to be relatively simple among all varieties, although there are many of them. Every uniruled variety over a field of characteristic zero has Kodaira dimension −∞. The converse is a conjecture which is known in dimension at most 3: a variety of Kodaira dimension −∞ over a field of characteristic zero should be uniruled. A related statement is known in all dimensions: Boucksom, Demailly, Păun and Peternell showed that a smooth projective variety "X" over a field of characteristic zero is uniruled if and only if the canonical bundle of "X" is not pseudo-effective (that is,