The American lotus exists in Maryland's Mattawoman Creek, Great Bohemia Creek, Little Blackwater River and the Sassafras River.

The Buttercup Scorpion-weed is in floodplains and adjacent forests. It is a small blue flower that appears in April and May.

The Featherfoil floats in a Caroline County bay and produces seeds that will germinate on the mud after it dries each summer.

Harperella is adapted to the annual rise and fall of river waters. Harperella seeds germinate during low summer flows.

Indian paintbrush is partially parasitic. Some of its food is from photosynthesis, and its other food is from its neighbors. It is very rare in Maryland and lives along streams and in moist meadows in the mountains.

The Narrow Melicgrass exists in open woodlands, rocky glades and road banks.

The Swamp Pink grows in forested wetlands of Maryland’s coastal plain, in Cecil and Anne Arundel County. It was classified as an Endangered Species by the State of Maryland in 1987.

Tawny cottongrass exists in Garrett County bogs in high elevation wetlands.

Wild False Indigo is Threatened in Maryland. Its habitat is vulnerable to trampling and development.

The Mountain Sandwort's only known Maryland location on the basalt glade on Catoctin Mountain. It is listed as Endangered.