Betel nut is cultivated in China, India, Sri Lanka, Thailand, Malaysia and the Philippines. The trunk has no branches, up to 12? 15m.

2. Areca catechu is the seed of Areca catechu (Palmae). Areca catechu leaves are the leaves of betel leaves of Piperaceae. Betel nut is slightly smaller than an egg, with fibrous skin and seeds, that is, betel nut. The endosperm is hard with gray-brown spots.

3. Areca nut is at 8? 1 1 Harvest the fruit before it is fully ripe, peel it, cook it, cut it into thin slices and dry it in the sun, and it will be dark brown or black after drying. Areca catechu is the raw material of catechu, and its main alkaloid is arecoline, which is used as an insect repellent by veterinarians.