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The study also suggests that calamints are genetically diverse, so much so that new species designations are likely warranted.

Some of the most beloved summer annuals and perennials — elephant ear, coleus, lantana, calamint, rudbeckia and echinacea — have a place in the container garden.

All six of our featured summer annuals and perennials — elephant ear, coleus, lantana, calamint, rudbeckia and echinacea — have a place in the container garden.

It's especially rare because it collects pollen on its face, and depends on another threatened species -- a blooming plant known as Ashe’s calamint.

Nepitella, also known as lesser calamint, is an essential herb in Italian cooking but little known in the United States.