Color of the 8 to 15 rays surrounding each head of flowers, a pale blue. Leaves, wavy, somewhat toothed, the lowest 2 to 5 inches long, on margined petioles with heart-shaped bases; those higher up, petioled, the petioles much swollen and clasping the stem; the upper sessile, clasping; those on branches, very small. Stem, stiff, stout, 1 to 3 feet high, branched near the top. Flowers, medium-sized, panicled or racemose on the spreading branches. September to November.
Common East and South in dry woods, copses, and fields.