Basal

In a phylogenetic tree, being a group, or member of a group, which diverged earlier.

For example, berrypeckers, satinbirds, stitchbird, New Zealand wattlebirds, Australasian robins, picathartes, rockjumpers, rail-babbler and hyliotas are all basal Passerida.

Also, located at or related to the base, as in plants.