Su Tie fruit is iron tree fruit, also known as phoenix egg, is the seeds of the plant Su Tie in the genus Su Tie in the family of iron.

The fruit of the ironwood is mainly distributed in the southwestern part of China's Yunnan Simao, Jinghong, Lancang, Luxi and other areas, Guangxi, Guangdong is cultivated, Myanmar, Thailand, Vietnam is also distributed. Its fruit is ovoid or broadly obovoid, with a pointed tip, yellow-brown or light brown when ripe, and the seed coat is hard, smooth, and glossy, with a length of about 2-3 centimeters and a diameter of 1.8-2.5 centimeters. It is often born in the understory of monsoon forests and is mainly harvested in summer and fall. The fruit can be used as medicine in small quantities, with a bitter, sour flavor and flat nature. It enters the lung and large intestine meridians. It has the effect of removing dampness and lowering rebelliousness, strengthening the spleen and stomach, expelling phlegm and relieving cough. The main treatment for enteritis, dysentery, dyspepsia, eructation, tracheitis, bronchitis. The fruit is poisonous and cannot be eaten directly.

Yunnan southeastern fruit evergreen palm-like woody plants. Stem cylindrical, surrounded by persistent petiole base. Leaves pinnate, up to 0.5-2.4m long, thick leathery and hard, pinnae striped, up to 18cm long, the edge of the significant anticline. Flowers terminal, dioecious, male bulbous flowers long cylindrical, female bulbous flowers slightly oblate, flowering period June-August. Seeds ovate and slightly compressed, red, 2-4cm long, seed maturity in October.

The fruit is a tropical, subtropical tree species, native to southern China. Sex like strong light, good born in warm, dry and well-ventilated place. Not cold hardy, slow growth. Soil to fertile, slightly acidic sandy soil is suitable. Southeastern is one of the oldest surviving plants in the modern world, its beautiful body, quite tropical style, often arranged in the center of the flower beds or potted plants arranged in large venues, or the shoots processed into brightly colored dried leaves, become a confident flower arrangement with materials. Flowers, leaves and fruits can be used as medicine.