Photosynthesis took place, and the roots of the sunflower plants produced tubers with tough skins.

It is one of three species of the mint family native to Africa that produce edible tubers.

The long primary roots extend beneath the soil surface, producing large tubers 40-50 centimetres long.

The plant produces one or more spindle-shaped or cylindrical tubers.

Amandine shaws typically produce long tubers with very pale, unblemished skin.

This plant produces edible tubers that were heavily collected by the Native Americans as a food source.

It produces tubers, to which above-ground parts of the plant die back to after producing fruit in the summer.

It produces tubers; however the bulbils which grow at the base of its leaves are the more important food product.

These creeping rhizomes occasionally produce tubers, and often outweigh the above-ground growth by 100 to 1.

Bloomers produce round purplish-blue tubers with fairly deep eyes.