Celeriac
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Celeriac, also called celery root, knob celery, and turnip-rooted celery, is a group of cultivars of Apium graveolens cultivated for their edible bulb-like hypocotyl, and shoots.
A celeriac hypocotyl sliced in half, and with the greens removed
Hypocotyl
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The hypocotyl is the stem of a germinating seedling, found below the cotyledons and above the radicle.
Celeriac
…turnip-rooted celery (although it is not a close relative of the turnip), is a group of cultivars of Apium graveolens cultivated for their edible bulb-like hypocotyl, and shoots. Celeriac is widely cultivated in the Mediterranean Basin and in Northern Europe. It is also but less commonly cultivated in North Africa…
Diagram of Scouler's willow (Salix scouleriana) seed, indicating position of hypocotyl.