Ionactis linariifolia also known as the flax-leaf ankle-aster, flaxleaf whitetop or simply aster is a North American species of plants in the daisy family. It was initially classified by Carolus Linnaeus as Aster linariifolius, known as the stiff-leafed aster.Ionactis was classified as a separate genus by Edward Lee Greene in 1897. Ionactis linariifolia grows across much of eastern and central North America from Florida north as far as Québec and New Brunswick, and west to extreme eastern Texas.