Tuber

Tuber, a shortened shoot with a swollen stem, and small, scaly leaves, usually developed underground, as in the potato and the Jerusalem artichoke. The buds are known as "eyes," and the plant may be reproduced by cuttings of the tubers (then known to growers as "seed~tubers"), each cutting having necessarily at least one eye. Under abnormal conditions the potato-plant will develop green tubers in the axils of its aerial leaves.