Vetch n. : Any leguminous plant of the genus Vicia, some species of which are valuable for fodder. The common species is V. sativa.

Example:
neighbor planted crown Vetch and it spreads to my ground cover. How can I kill it w/o killing my plants?

Taxonomy
Vicia, Broad Bean, Vetch, species, vetches, Common Vetch, Vicia faba, seeds, Bean, faba, Bitter Vetch, sensu, auct, Boiss, Hook, the seeds, free encyclopedia, Tufted Vetch.

Defination from the web:
Vetch (V. ervilia) is one of the first domesticated crops. ... The Hairy Vetch also has well-established uses as green manure and allelopathic cover crop. ... Split Common Vetch seeds resemble split red lentils (Lens culinaris), and has been occasionally mislabelled as such by ...