Lathyrus heterophyllus, a potentially overlooked alien in Belgium
In August 2011 I came across a dense population of a species of Lathyrus that I know since at least 25 years. It grows by a disused railway track and in adjacent grassland near Kortemark (prov. West-Flanders, Belgium; IFBL D1.26.41). It has always been referred to as Lathyrus latifolius L. and is mentioned as such on waarnemingen.be as well (see for instance http://waarnemingen.be/waarneming/view/55774177).