Cold potato is a leguminous herb vine. Thick, twining, slightly hairy, sometimes slightly woody at the base. The raceme is 15-30 cm long, with 3-5 flowers per section; Bracteoles setose, caducous; Calyx is 9- 1 1 mm long and densely covered with long bristles; Corolla light purple or reddish, flag nearly round; 8- 10 capsules per pod, nearly square.

Root block, spindle-shaped or oblate, generally about 20-30 cm in diameter, fleshy. Take its underground root tuber as raw food or vegetable food. Seeds are highly toxic and should not be eaten, but they can be used as pesticides to control aphids.

Extended data

Nutritional value of cold potato: cold potato is rich in water and carbohydrates. Eating sweet potatoes can clean up toxins accumulated in the body, accelerate blood circulation and promote metabolism. Moreover, sweet potato itself tastes sweet and juicy, suitable for eating in hot summer, which can not only relieve summer heat, but also clear liver, remove fire and reduce dryness.

Sweet potato is generally regarded as fruit, peeled and washed and eaten raw. Raw sweet potatoes are crisp, sweet and full of water. As a vegetable, it can be said that the sweet potato is shredded and mixed with rice vinegar, sugar, sesame oil and other cold dishes, which is not only sweet and sour and crispy, but also can stimulate appetite, clear the heart and quench thirst, and has the functions of promoting appetite and helping digestion.

Chemical constituents of cold potato: pachymenogenin, A(C30H38O6), B(C23H 18O7) and pachymenone (C20H 14O7).

The seeds contain erosnin (C 18H8O6), rotenone (C23H22O6), erosone, pachyrrhizin and isorotenone.

Baidu encyclopedia-cold potato

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