Gallic acid is found in a number of land plants.

How true is this and how much of our oxygen comes from land plants?

It is one of the best described early land plants.

The first land plants in the state grew during the Devonian.

Much of human nutrition depends on land plants, either directly or indirectly.

The green algae and land plants have lost that pigment.

The rest is absorbed by the oceans and land plants.

This is the most ancient group of land plants.

They don't have branches, leaves or flowers like land plants.

The early land plants had no vascular system and required free water for their reproduction.