▁mil ky ▁late x ▁found ▁in ▁its ▁young ▁parts ▁and ▁is ▁native ▁to ▁most ▁of ▁Europe , ▁extending ▁east wards ▁to ▁Central ▁Asia . ▁Another ▁English ▁common ▁name ▁for ▁the ▁plant ▁is ▁mar sh ▁h og ' s ▁f enn el ▁( h og ' s ▁f enn el ▁( un qual ified ) ▁and ▁sea ▁h og ' s ▁f enn el , ▁by ▁contrast , ▁are ▁common ▁names ▁of ▁Pe u ced an um ▁offic inale , ▁a ▁per enn ial ▁species ▁in ▁the ▁same ▁genus , ▁found ▁in ▁d rier ▁habit ats , ▁but ▁having ▁similar ▁medic inal ▁properties ). ▁ ▁Pe u ced an um ▁pal ust re ▁grows ▁( as ▁its ▁specific ▁name ▁implies ) ▁in ▁wet lands , ▁shall ow ▁water ▁at ▁the ▁marg ins ▁of ▁rivers ▁and ▁est u aries ▁and ▁occasionally ▁in ▁d itch es ▁and ▁other ▁smaller ▁water ▁features . ▁It ▁is ▁relatively ▁sh ade - tol er ant ▁and ▁requires ▁season al ▁sub mer ging ▁of ▁the ▁site ▁to ▁comp ete ▁with ▁other ▁plants . ▁It ▁is ▁well - known ▁to ▁le pid opter ists ▁as ▁the ▁main ▁food plant ▁of ▁the ▁Old ▁World ▁sw allow tail . ▁ ▁Cambridge ▁milk ▁par s ley ▁is ▁the ▁common ▁English ▁name ▁of ▁a ▁different ▁plant : ▁Sel in um ▁car v ifolia ▁- ▁also ▁an ▁um bell ifer , ▁but ▁belonging ▁to ▁a ▁different ▁genus . ▁The ▁two ▁plants ▁are ▁not ▁only ▁similar ▁in ▁appearance , ▁but ▁also ▁grow ▁in ▁similar ▁habit ats , ▁although