Penthorum sedoides, known by the common name ditch stonecrop, is a perennial forb native to the eastern United States and Canada[1] which produces small white flowers in summer.

The erect lower portion of the stem is smooth, but the curved branching inflorescence is covered in glandular hairs.

It has been recorded in the states of Alabama, Arkansas, Connecticut, Washington, D.C., Delaware, Florida, Georgia, Iowa, Illinois, Indiana, Kansas, Kentucky, Louisiana, Massachusetts, Maryland, Maine, Michigan, Minnesota, Missouri, Mississippi, North Carolina, North Dakota, Nebraska, New Hampshire, New Jersey, New York, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Virginia, Vermont, Washington, Wisconsin, and West Virginia, as well as the Canadian provinces of British Columbia, Manitoba, New Brunswick, Ontario, and Quebec.

Penthorum sedoides is only native to the eastern half of the continent, in the Pacific Northwest it is an introduced species found in commercial cranberry bogs.

[1][4] In Virginia, Penthorum sedoides grows in habitats such as alluvial swamps, floodplain pools, rocky or sandy shores, fens, marshes, beaver ponds, and disturbed wetlands.