a slender-stemmed plant, with a brown head

These slender, pithy-stemmed plants grow to over four feet in height, and
are topped by long, fat, dark brown heads. Dense clusters of coarse, long
green leaves surround each fruit-bearing stem.

It is a slender-stemmed plant, with a brown head.
It weighs about one pound.

You identify a slender-stemmed plant, with a brown head.
It is an unsellable plant.
It weighs twelve ounces, and it is worth about one busc.
Its keywords are plant, bulrushes, bulrush, rush, and stem.