Color, greenish or dull purple. Sepals, 5, 3 green, 2 colored like the petals. These form the wings, larger than the others. Flowers, in clover-like heads or spikes, on low stems, 4 to 15 inches high. Stems, square, slightly winged. Leaves, in whorls of 4, long, narrow, a few scattered. Heads of flowers rather large and showy. July to September.
Marsh milkwort (Poly gala Cruciata)
Time of blossoming and range nearly the same as P. cruciata.