what are parsnips?
It is a root vegetable closely related to carrot and parsley; all belong to the family Apiaceae.
Parsnip
The parsnip, Pastinaca sativa, is a root vegetable closely related to carrot and parsley; all belong to the family Apiaceae.
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.
wiki:4776853
Parsnip [SEP] Introduction
The parsnip, Pastinaca sativa, is a root vegetable closely related to carrot and parsley; all belong to the family Apiaceae. It is a biennial plant usually grown as an annual. Its long, tuberous root has cream-colored skin and flesh, and, left in the ground to mature, it becomes sweeter in flavor after winter frosts. In its first growing season, the plant has a rosette of pinnate, mid-green leaves. If unharvested, in its second growing season it produces a flowering stem topped by an umbel of small yellow flowers, later producing pale brown, flat, winged seeds. By this time, the stem has become woody and the tuberous root inedible.