Seneca Snakeroot (Polygala senega)

Seneca Snakeroot (Polygala senega)

Seneca snakeroot is a perennial herb typically 10 to 18 inches tall. Its flowers form dense, spike‑like racemes at the stem tip, with each small bloom about 1/6 inch long and colored white to greenish‑white, ending in a distinctive fringed crest. The leaves are 1 to 3 inches long and 1/3 to 1 1/3 inch wide, linear to lance‑elliptic, widest at or just below the midpoint, and either smooth or minutely hairy.

This species grows in full to partial sun and favors dry to mesic, well‑drained soils—especially sandy, gravelly, or rocky substrates. In Wisconsin it is found in prairies, savannas, open woodlands, and dry, rocky stream margins or slopes. Its presence often signals intact, undisturbed native plant communities.

Sources:

USDA PLANTS Database — Polygala senega species profile

Minnesota Wildflowers — Polygala senega (Seneca Snakeroot)

Illinois Wildflowers — Seneca Snakeroot (Polygala senega)

Flora of North America — Polygala senega botanical description

Michigan Flora / University of Michigan — Polygala senega account

NatureServe Explorer — Polygala senega conservation status and distribution

UW–Madison Division of Extension — Dry prairie and savanna species of Wisconsin

(LS)