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Tap root
The entire onion plant is edible.
Buttress roots are not edible.
an edible circle is an onion ring
The onion is completely edible. The skin, though papery and edible is usually removed as is the small root at the bottom of the bulb. these two parts are less palatable and usually discarded. The bulb and leaves (green onion) are used in a large variety of ways.
The carrot, radish, onion and sugar beet have stems that are above ground and the roots and edible tuber/bulb is underground. The stem is green and the carrot is orange; the beet is red, the onion is white/red; the radish is red/white.
Jack-in-the-pulpit roots are edible, but only after drying and cooking it.
Onion roots emerge from the base of the condensed stem.
aerial stem
The reed is not edible, but some species of reed have edible tuberous roots.
You can eat Indian cucumber roots
The Chinese use the roots in herbal medicine.
onion