Glabrous; stems hollow; leaves 2-4 pinnate, leaf-segments ovate/linear; usually no bracts, short bracteoles.  Some umbels axillary and opposite leaflets; peduncles shorter than rays. 

Oenanthe fluviatilis; other wetland umbellifers

Good quality photos of umbels (side-on, not top-down) to show bracts/bracteoles; photograph of leaves and growth habit; note habitat.  We recommend that you retain a specimen in case expert verfication is needed

Still or slow-moving water, marshes, shallow ponds and ditches

Declining throughout its range.  See the BSBIs Plant Atlas 2020 website

It is on the current VC55 Rare Plant Register (Hall & Woodward, 2022) as 'locally rare' with few recent records.