Maianthemum trifolium (Three-leaf Solomon's-seal, three-leaf Solomon's-plume, threeleaf false lily of the valley, smilacine trifoliée) is a species of flowering plant that is associated with extremely wet environments and is native to Canada and the northeastern United States as well as St. Pierre and Miquelon and Asia (Siberia).

[3] It is a herbaceous perennial plant growing erect, 10–25 cm (4–10 in) tall.

It grows off spreading sympodial rhizomes with roots found only at nodes.

[3] Found in all Canadian provinces and territories and in the USA in some northeastern states (Connecticut, Maine, Massachusetts, Michigan, Minnesota, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, and Wisconsin).

[3] Maianthemum trifolium often forms dense patches in wet forests, sphagnum bogs and other wetlands and is sometimes considered to be aquatic.