▁top , ▁or ▁gre as egr ass , ▁is ▁a ▁large , ▁robust ▁per enn ial ▁bunch gr ass ▁native ▁to ▁eastern ▁North ▁America . ▁ ▁It ▁w ides p read ▁throughout ▁its ▁range ▁and ▁is ▁most ▁often ▁found ▁in ▁man - made ▁habit ats , ▁such ▁as ▁hay ▁me adows ▁and ▁la wn s . ▁ ▁The ▁se eds ▁are ▁pur ple , ▁giving ▁the ▁grass ▁its ▁common ▁name . ▁The ▁se eds ▁are ▁also ▁o ily , ▁leading ▁to ▁its ▁other ▁common ▁name , ▁" gre as egr ass ". ▁It ▁reprodu ces ▁by ▁seed ▁and ▁till ers . ▁ ▁The ▁grass ▁is ▁often ▁confused ▁with ▁the ▁similar ▁looking ▁Johnson ▁grass ▁( S org hum ▁ha le p ense ), ▁although ▁it ▁is ▁only ▁dist antly ▁related . ▁Tr id ens ▁flav us ▁is ▁easily ▁distinguished ▁by ▁its ▁short , ▁hair y ▁lig ule . ▁ ▁It ▁is ▁a ▁lar val ▁host ▁to ▁the ▁common ▁wood ▁n ym ph , ▁cross line ▁ski pper , ▁little ▁glass yw ing , ▁and ▁the ▁Z ab ul on ▁ski pper . ▁ ▁Gallery ▁ ▁References ▁ ▁External ▁links ▁ ▁Samuel ▁Roberts ▁No ble ▁Foundation ▁ ▁Illinois ▁Wild flow ers ▁ ▁Category : Ch lor ido ide ae ▁Category : B unch gr ass es ▁of ▁North ▁America ▁Category : Pl ants ▁described ▁in ▁ 1 7 5 3 <0x0A> </s> ▁Bent ho com etes ▁is ▁a ▁genus ▁of ▁c usk - e els . ▁ ▁Species ▁There ▁are ▁currently ▁two ▁recognized ▁species ▁in