乐发ll　　The seedling is spreading and green. The stem is green and its cross section is triangular shape. It has green leaves, flat leaf margins, and elliptic compound leaves growing alternating and oppositely. The stipule is obovate. Cymose flower bud is elliptic and green. The sepal is green and lanceolate. The corolla is light purple with pointed petal and the pointed end is white color. The pistil stylus is medium-long and the stylus head is rounded, amitotic and green. 5 stamens are conical and yellow, without natural berry. The potato is long-oval, and the potato meat is white with tight density. The bud eye is shallow and has 9.30±1.70 bud eyes. The potato tuberization is evenly and the dormant period is 30±2 days. The yield per plant is 0.43±0.01kg, the fruit number of single potato is 4.35±0.26 pieces, and the weight of single potato is 0.10±0.01kg. The potato starch content is 16.26%, Vc15.47mg/100g, reducing sugar content is 0.27% and dry matter is 21.11%. It is a medium maturing variety and its whole growth period is 120±3 days. It has medium cold endurance and weak drought resistance. The storability of the potato is medium. It is resistant to ring rot.