There are no known plants or seeds from A. brownii in any botanical gardens.

This species is the only known endemic Canadian plant to go extinct since the 16th century.

The oldest known cultivated plant is a parthenocarpic fig first grown at least 11,200 years ago.

It is the rarest known plant in Washington state.

About 270 of the island's 828 known plant species are endemic.

She looked for similarities to known plants, and understood categories within larger categories.

In 2001 there were only 56 known plants.

Of these, about one eighth of known plant species are threatened with extinction.

This would make the species by far the most advanced known plant of the time.

Plant classification is the placing of known plants into groups or categories to show some relationship.