花柳界[karyuukai] red-light district
花柳病[karyuubyou] sexually transmitted disease
蒲柳[horyuu] purple willow
枝垂柳[shidareyanagi] weeping willow (Salix babylonica)
川柳[senryuu] comic haiku

楊柳[yanagi] willow (any tree of genus Salix)
柳腰[yanagigoshi] slim waist
柳川鍋[yanagawanabe] soup prepared with dojou
柳び[ryuubi] beautiful eyebrows
花柳[karyuu] red-light district

木天蓼[matatabi] silver vine (Actinidia polygama)
蓼食う虫も好き好き[tadekuumushimosukizuki] there's no accounting for taste
紅蓼[benitade] water pepper (Polygonum hydropiper forma purpurascens)
仙蓼[senryou] Chloranthus glaber
大毛蓼[ooketade] kiss-me-over-the-garden-gate (species of smartweed, Polygonum orientale)

柳蓼[yanagidate] water pepper (Persicaria hydropiper)
藍蓼[aitade] dyer's knotweed (Persicaria tinctoria, used to produce indigo dye)
蓼科[tadeka] Polygonaceae (knotweed family of plants)
蓼藍[tadeai] dyer's knotweed (Persicaria tinctoria, used to produce indigo dye)