▁the ▁common ▁hop , ▁Hum ulus ▁l up ulus . ▁As ▁a ▁result , ▁the ▁Japanese ▁hop ▁is ▁not ▁used ▁in ▁the ▁production ▁of ▁be er . ▁ ▁This ▁species ▁is ▁a ▁host ▁plant ▁for ▁the ▁but ter fly ▁Pol yg onia ▁c - a ure um , ▁the ▁Asian ▁comma . ▁ ▁Description ▁▁ ▁Well - develop ed ▁leaves ▁with ▁ 5 - 9 ▁lo bes ; ▁ab ax ial ▁surfaces ▁of ▁leaves ▁pub es cent , ▁but ▁not ▁dens ely ▁so ; ▁inf ruct esc ence ▁rarely ▁longer ▁than ▁ 2   cm , ▁with ▁b ract s ▁and ▁b ract e oles ▁less ▁than ▁ 1   cm ▁long , ▁and ▁notable ▁spin ul ose - c ili ate ▁In fl ores c ences : ▁st amin ate ▁infl ores c ences ▁ere ct , ▁ 1 5 – 2 5   cm , ▁flower ▁an thers ▁without ▁g lands ; ▁p ist ill ate ▁infl ores c ences ▁sp ikes , ▁con eli ke , ▁o void ; ▁b ract e ole ▁ov ate - orb ic ulate , ▁ 7 – 1 0   mm , ▁pil ose , ▁marg ins ▁dens ely ▁c ili ate - h air y . ▁Inf ruct esc ences ▁p end ul ous , ▁green , ▁con eli ke , ▁o void ▁to ▁ob long , ▁( 1 -) 1 . 5 - 3 (- 4 ) ▁cm ; ▁b ract e oles ▁without ▁yellow ▁g lands . ▁ ▁Dis pers al