▁h ort icult ural ▁purposes . ▁ ▁The ▁me adows ▁are ▁particularly ▁rich ▁in ▁p ign ut ▁( Con op od ium ▁maj us ), ▁a ▁relative ▁of ▁par s ley , ▁which ▁formed ▁a ▁break time ▁sn ack ▁for ▁children ▁in ▁former ▁times . ▁If ▁the ▁plant ▁is ▁d ug ▁up ▁a ▁small ▁pot ato - like ▁structure ▁is ▁found ▁which ▁when ▁e aten ▁raw ▁has ▁a ▁slightly ▁nut ty ▁taste . ▁It ▁is ▁available ▁commer cially ▁for ▁sal ads , ▁etc . ▁ ▁Hem lock ▁water ▁drop wort ▁grows ▁well ▁in ▁the ▁wet ter ▁areas ▁and ▁is ▁best ▁left ▁alone ▁as ▁the ▁name ▁hem lock ▁suggests . ▁The ▁large ▁leaves ▁of ▁the ▁but ter bur ▁( P et as ites ▁hy brid us ) ▁are ▁found ▁in ▁several ▁areas ; ▁its ▁name ▁h ark ens ▁back ▁to ▁the ▁days ▁before ▁cl ing film ▁or ▁cheap ▁paper ▁when ▁the ▁leaves ▁were ▁used ▁to ▁wrap ▁but ter ▁dest ined ▁for ▁the ▁market . ▁Water ▁rag wort ▁( or ▁Sar ac en ' s ▁rag wort ) ▁( a ▁species ▁of ▁S ene cio ) ▁is ▁an ▁introduced ▁plant ▁which ▁grows ▁along ▁the ▁rivers ide ▁in ▁tall ▁stands . ▁It ▁is ▁common ▁on ▁the ▁Gar no ck ▁and ▁at ▁present ▁quite ▁rare ▁elsewhere . ▁H imal ay an ▁b als am ▁or ▁polic emen ' s ▁hel m ets ▁is ▁another ▁introduction , ▁but ▁a ▁common ▁one . ▁Gi ant ▁h og we ed ▁is ▁beginning ▁to ▁make ▁its ▁presence ▁felt . ▁It ▁is