This is an annual herb producing a solid stem 10 to 40 centimeters tall.

It erects one thin, tall stem which may approach a meter in height.

Water is pumped up a tall central stem and then tumbles into a small bowl.

The second year plants normally produce a single unbranched stem usually 1-2 m tall.

One particularly scraggly tall stem had to be cut off.

They are mostly terrestrial ferns, usually with a single tall stem.

It produces an erect stem up to 50 centimeters tall.

The inflorescence is borne on a stem just a few centimeters tall.

Small, pointed leaves are arranged alternately about the tall stem.

This is an annual herb producing a thin stem 10 to 50 centimeters tall.