2. Cassava, also known as Nanyang sweet potato, wood sweet potato and tree potato, is the root tuber of Euphorbiaceae plants.

3. Mainly distributed in tropical areas.

It is a shrub-like perennial crop.

5. The stems are erect, woody, 2 to 5 meters high, with palmately parted leaves, papery and lanceolate.

6. unisexual flowers, panicles, terminal, monoecious.

7. Cassava was introduced to China in the 1920s. It was first cultivated in Gaozhou, Guangdong, and then introduced to Hainan Island. Now it has been widely distributed in South China, with Guangxi, Guangdong and Hainan as the most cultivated areas, and Fujian, Yunnan, Jiangxi, Sichuan, Guizhou and other southern provinces have also introduced and tried planting.

8. Cassava is native to tropical America and is widely cultivated in tropical areas all over the world.

9. There are long cylindrical tuberous roots with meat. Root tuber is rich in starch, which can be eaten or pasted. It can be used to grind cassava flour, make bread, provide cassava starch and starch for sizing, and even alcoholic drinks.

10. But roots, stems and leaves all contain cyanosides, so it is not suitable to eat them raw. It must be soaked in water for a long time and cooked to remove toxicity.

1 1. Primitive people used complicated processes such as friction, extrusion and heating to detoxify.

12. The stem is upright and smooth, containing milk.

13. Leaves alternate, palmately 3-7-parted, lobes lanceolate to oblong, like castor leaves, but deeper.