A plant genus of the family RHAMNACEAE. Members contain nummularogenin (a spirostane) and is the source of an edible fruit.

The buckthorn plant family, of the order Rhamnales, includes some species with edible fruits and some that are medicinal.

A plant genus of the family RHAMNACEAE. Root nodules host the Frankia (ACTINOMYCETES) nitrogen-fixing bacteria.

The outer layer of the woody parts of plants.