Swamp Lousewort
Pedicularis lanceolata
The USDA lists 7 states that see this as an endangered or 'historic' plant.
From Nearctica
Identification: Flowers yellow with a tubular corolla. Upper petal lobes fused into a convex, hood-like structure with a descending pistil arising from the tip of the hood. Lower 3 petal lobes fused into a lower 3-lobed banner. Flowers clumped near the apex of the plant. Stems and leaves smooth, not hairy. Leaves elongate and heavily lobed. Leaves nearly always opposite. Petioles of lower leaves short to non-existent. Plant 1 to 2 feet in height.
Distribution: Manitoba in the west to New England in the east, southward to North Carolina, Georgia, and Nebraska.
Habitat: Swamp Lousewort is a wetlands species found in swamps and wet meadows.
Flowering period: August to October.