what are the uses of the plant?
Broad-leaved dock ("Rumex obtusifolius") used to be called butter dock because its large leaves were used to wrap and conserve butter.
Rumex
Broad-leaved dock ("Rumex obtusifolius") used to be called butter dock because its large leaves were used to wrap and conserve butter.

when did radishes become a food source for humans They were domesticated in Asia prior to Roman times. how are they consumed? They are mostly eaten raw as a crunchy salad vegetable with bite. are there other varieties? Yes, they differ based on the  seasons when they are grown and a variety of shapes, lengths, colors, and sizes, such as red, pink, white, gray-black, or yellow radishes, with round or elongated roots that can grow longer than a parsnip. what are parsnips? It is a root vegetable closely related to carrot and parsley; all belong to the family Apiaceae. what chemical compound give the first mentioned root vegetable its sharp taste? Glucosinolate, myrosinase, and isothiocyanate is the first mentioned compound found in any other plants? Yes, in mustard, cabbage, and horseradish. is the vegetable mentioned in the beginning and the third mentioned vegetable in the answer above are the same? No, but belongs to the same family of Brassicaceae where are they commonly cultivated and used? It is perennial in hardiness zones 2–9. how is the the third mentioned vegetable in your answer described? It is tall, hairless bright green unlobed leaves that may be mistaken for docks ("Rumex"). what is this plant mentioned above that it can be mistaken as? These are a genus of about 200 species of annual, biennial, and perennial herbs in the buckwheat family, Polygonaceae. are they described as fossils? UNANSWERABLE
wiki:4970373
Rumex [SEP] Uses
These plants have many uses. Broad-leaved dock ("Rumex obtusifolius") used to be called butter dock because its large leaves were used to wrap and conserve butter. "Rumex hymenosepalus" has been cultivated in the Southwestern US as a source of tannin (roots contain up to 25%), for use in leather tanning, while leaves and stems are used for a mordant-free mustard-colored dye. These plants are edible. The leaves of most species contain oxalic acid and tannin, and many have astringent and slightly purgative qualities. Some species with particularly high levels of oxalic acid are called sorrels (including sheep's sorrel "Rumex acetosella", common sorrel "Rumex acetosa", and French sorrel "Rumex scutatus"), and some of these are grown as leaf vegetables or garden herbs for their acidic taste.