The erect stem is surrounded by clusters of spreading leaves.

It is an annual herb growing an erect, slender stem.

The leaves are green and arranged oppositely on the erect stem.

Most have an erect stem, whose height varies from 20 to 120 cm.

This annual grows on a thick erect stem with a few short, pointed leaves.

The growth habit is on a single erect stem, with a few short branches starting halfway from the base.

It produces a single erect stem which can reach two meters in height.

It has an erect stem which may have a few branches or none.

It produces an erect stem up to 50 centimeters tall.

The leaves are mainly located around the base of the erect stem.