the flowers of liatris spicata

inflorescence underground aboveground herbaceous asteraceae lanceolate decreasing wildflower perennial belonging ophiuchus flattened spherical gradually extending obliquely vegetable straight accounts arranged lavender flowers liatris spicata upright conical hualien prairie produce family tubers swells leaves linear bottom curled entire length purple colors flower meadow willd plant genus shape lower upper dense spike light color small bloom white grass lilac field shrub base stem pure herb food crop top