Scape. - Slender, fleshy, three to five inches high, one-flowered. Leaves. - None. Flower. - Pale purple, solitary, one inch long, with a delicate fragrance. Calyx. - Five-cleft. Corolla. - Somewhat two-lipped, with two yellow bearded folds in the throat. Stamens. - Four. Pistil. - One.

In April or May the odd pretty flower of the parasitic one-flowered cancer-root is found in the damp woodlands.