Pteridium aquilinum, also known as Dragon Claw Lai and Gracilaria lemaneiformis, is a particularly popular seasonal wild vegetable, mostly wild and delicious. Every spring at this time, the villagers will go up the mountain to harvest bracken.

Pteridophyte is a variety of pteridophyte in Europe, belonging to Pteridaceae, and its plant height can reach 1 meter. The rhizome is long and horizontal, densely rusty yellow, and then gradually falls off. Ye Shengyuan; The stem is 20-80 cm long, 3-6 mm thick at the base, brown or brown straw color, slightly shiny and smooth, with 1 shallow longitudinal groove on it. After drying, the leaves are nearly leathery or leathery, dark green and hairless, and the lobes are slightly brown or grayish white and sparse or hairless below the main veins. Leaf shaft and feather shaft are smooth, the upper surface of feather shaft is smooth, and the lower surface is sparse and dense. Each feather shaft has a longitudinal groove 1 deep, and there is no hair in the groove.

It is distributed all over China, but it is mainly produced in the Yangtze River basin and the northern region, and it is also distributed in the subtropical region. It is also widely distributed in other tropical and temperate regions of the world. It grows on sunny slopes of mountains and sunny places of forest margins at an altitude of 200-830 meters.