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Showy tick-trefoil flowers are about a 1/2" tall and 1" long, pea-like with five petals — an upper petal (banner or standard) with two elongate, yellowish-cream spots at its base, two lower petals (wings) forming a chamber perpendicular to the upper petal, and another pair of petals forming a "keel" within the wings. Emerging from between the wings and keel is a stout, upward-curved, white tube that bears a single style and several stamens at its tip.

Desmodium

Desmodium canadense

showy tick-trefoil [Blooms: Jun-Jul]