× Beruladium procurrens is an intergeneric hybrid plant in the umbellifer family (Apiaceae); the result of hybridisation between Berula erecta (lesser water parsnip) and Helosciadium nodiflorum (fool's water cress).
[1] In July 1979 Max Walters collected an unidentified plant from Chippenham Fen, Cambridgeshire, England; it resembled H. nodiflorum, but grew as a floating mass in a fen ditch with small, pedunculate umbels rising above the water surface.
[2] Later suggestions included a depauperate example of B. erecta, which can be confused with H. nodiflorum in the vegetative state, or else an intergeneric hybrid between the two.
Plants considered to be the same as those collected by Walters in 1979 still occur on Chippenham Fen and, in 2014, Alan Leslie reexamined the plants and sent them for molecular and cytogenetic analysis at the University of Leicester, which revealed a previously unknown intergeneric hybrid between B. erecta and H.
[1] The original Walters' material and the 2014 collection from Chippenham Fen are both 2n = 20,[1][5] which is consistent with an intergeneric hybrid between B. erecta (2n = 18[1]) and H. nodiflorum (2n = 22[1]) East Anglia (particularly Cambridgeshire and Suffolk).