a hemlock plant

It is a man-sized plant with very finely dissected leaves and large umbels of small, white flowers. Flowers and leaves are borne on a sturdy stem, and the top of the root is visible at ground level.

It is a hemlock plant.
It weighs half a pound.

You identify a hemlock plant.
It is a contaminated plant.
It weighs seven ounces, and it is worth about ten celeb.
Its keywords are hemlock and plant.