American cow‑wheat, is a herbaceous, hemiparasitic wildflower native to southern Canada and the northern United States, extending southward through the Appalachians. It is considered critically imperiled in Indiana and vulnerable in Ohio, but is secure and widespread in Pennsylvania, where it occurs in dry, open woods and rocky forest margins.

Although widespread in Pennsylvania, American Cow‑wheat is easy to overlook. Its branching, 6–16 inch stems form loose, delicate clumps that blend into the understory. The plant grows in dry, open woods, along trails, and in light gaps beneath pine, maple, or poplar. As a hemiparasite, it relies on both photosynthesis and root parasitism, using specialized haustorial connections to draw nutrients from nearby host plants—an interaction essential for vigorous growth and flowering.

Once established, American Cow‑wheat produces small, inconspicuous flowers on short stalks arising from the leaf axils of the upper branches. The surrounding leaves are narrow and lance‑shaped, with sharply pointed, triangular teeth along the margins. Each flower is about half an inch long and tubular, with a two‑lobed white upper lip that curls upward and a three‑lobed yellow lower lip that juts forward, giving the blossom a distinctive, snake‑head appearance.

The flowers attract bumblebees and small native bees for nectar and pollen, with butterflies visiting occasionally. After flowering, the seeds bear small, nutrient‑rich elaiosomes that attract ants, which carry the seeds back to their nests and aid in dispersal.

Very little has been recorded about the medicinal use of Melampyrum lineare. One Iroquois source notes that an infusion of the plant was used as an eye wash, but documentation is limited and the practice appears to have been uncommon.