Field horsetail is a primitive, non-flowering perennial with jointed, hollow green stems and whorled branches, resembling miniature evergreen trees. It is highly invasive and persistent, thriving in wet areas and spreading rapidly through underground rhizomes.

Great horsetail is a tall, bamboo-like perennial with jointed stems and whorled branches, thriving in wet or boggy conditions. It is prized for its architectural foliage but can be invasive and is best contained in water gardens or specialized plantings.

A primitive, non-flowering perennial with jointed, tubular green stems that resembles bamboo in appearance. It thrives in wet areas and spreads vigorously, making it useful for erosion control or naturalizing moist sites.

Wood horsetail is a delicate, fern-like perennial with feathery branched stems that create an airy, graceful appearance. It thrives in moist woodland settings and spreads slowly via rhizomes.