A cucumber

The cucumber (Cucumis sativus) is a widely cultivated creeping plant in the gourd family Cucurbitaceae. Its fruit, which is eaten as a salad vegetable, is of a cylindrical shape with rounded ends and has a green warty skin.

Special domed farms at the Habitat Mars complex produce abundant crops of food plants. Such is the surplus -- far in excess of what is required by the Martian residents -- that supplies of radishes, cucumbers and giant ears of corn are regularly shipped back to Earth.