Pickerelweed (Pontederia cordata)

Pickerelweed (Pontederia cordata)

Observation - Pickerelweed (Pontederia cordata) - UK and Ireland. Description: This was growing in a roadside pond. I'm not sure if it was natural or introduced; probably considered to be part of someone's garden. Photo 2 shows detail of the flower/spadex. Gardens & parks / hedgerow / fresh water Edit: Changed to match ChrisBrooks

This was growing in a roadside pond. I'm not sure if it was natural or introduced; probably considered to be part of someone's garden. Photo 2 shows detail of the flower/spadex.
Gardens & parks / hedgerow / fresh water
Edit: Changed to match ChrisBrooks' ID. Many thanks.