A herb with a rhizome or underground stem. It keeps growing from year to year. The stem is 1 m high. The stems are erect. The leaves are oval and 8-16 cm long by 6-10 cm wide. They are pale green and clasp the stem. The leaves curl at the tip. There are several flowers at the ends of stems. The flowers are greenish-white with purple-red spots. The fruit is a capsule 2-3 cm across.