Symplocarpus nipponicus Makino

Rhizome hypogeous, thinner. Leaves in a rosette; petiole to 20cm; leaf blade green, rarely variegated, ovate to narrowly ovate-oblong, 10–20 × 7–12cm, base obtuse to cordate-subcordate, apex acute; venation reticulate, midvein strong, primary lateral veins 6 or 7 on each side. Flowering with leaf appearance; peduncle purple, long. Spathe plain purple or mottled dark purple, broadly elliptic and boat-shaped, leathery. Spadix ellipsoid, stipitate. Flowers densely arranged.