Inkberry is a common name for several unrelated plants:

They are usually called hornworts, although this name is also used for unrelated plants of the division Anthocerotophyta.

The name bugleweed can refer to two unrelated plants:

She found that unrelated plants competed for soil nutrients by aggressive root growth.

Bay-rum tree sometimes is used as a reference to two unrelated plants:

Peganum harmala, an unrelated plant also known as "Syrian rue"

Tea tree or Ti-tree is a popular name that has been applied to a number of different, unrelated plants:

These seemingly unrelated plants again have the curious characteristic of like flowers.

Inter-cropping and dispersal among other unrelated plants can also reduce the effects of an attack.

"Flame trees" is another vernacular name, but may refer to a number of unrelated plants as well.