the flowers of otacanthus azure

distinctive otacanthus herbaceous platycodon diagonally elliptical indistinct serrations wildflower perennial belonging character flowering plantago petioles axillary flowers upright extends concave surface corolla tubular posture blossom produce linden family square leaves midrib convex smooth blooms purple petals flower unique period august nature yellow azure ronse plant genus shape stems edges veins large upper lower march petal green shrub lilac like gold long leaf fine side back