用英文描写土豆的外表

Herbaceous annual (Solanum tuberosum) in the nightshade family. One of the world's main food crops, the potato differs from other food crops in that the edible portion is a tuber. Highly digestible, potatoes are prepared for eating in many ways and are a major source of starch as well as amino acids, protein, vitamin C, and B vitamins. The stem grows 20 – 40 in. (50 – 100 cm) tall, sprouting spirally arranged compound leaves. Underground, stems extend as stolons, the ends of which enlarge into 1 – 20 tubers of variable shape and size. The tubers have spirally arranged buds (eyes) that may remain dormant after the tuber is fully grown for up to 10 weeks or more; they grow into plants identical to the parent plant. A native of the Andes, the potato (also known as the common potato, white potato, or Irish potato) was carried by Spaniards into Europe during the 16th century. A century later, it had become the major food crop in Ireland; disastrous damage to the crop by a fungal blig