Tufted to clump-forming from a fairly robust rootstock. Stems erect, to 50cm or more in height. Leaves oblong-ovate to lanceolate, slender-pointed. Flowers to 4.5cm long, cylindrical to narrowly urn-shaped without spreading lobes, blue-purple, in terminal clusters of up to five or more, late summer to autumn. G.a. forma albiflora is white, forma rhodantha has pink flowers. Eastern North America, in damp grassland and shrub. Too large and coarse for the rock garden.