Perennial herb with a creeping rhizome 20 cm - 1 m tall Stem: upright or ascending, slender, four-angled, unbranched to often many-branched from base, more or less straight-hairy. Leaves: in whorls of four, numerous, 1 - 2.5 cm long, half as wide, elliptic to oval, three-veined, more or less straight-hairy, and firm. Inflorescence: a two- to three-forked, widely spreading cluster of flowers. Flowers: terminating the branches of the inflorescence, distinctly stalked, greenish purple, 2 - 3 mm wide, more or less flat and circular in outline, with four short lobes. Stamens four, alternating with lobes, shorter than corolla. Styles two, short. Fruit: dry, indehiscent, spherical, paired, separating when ripe, one-seeded, bristly.

Similar species: No information at this time.

Flowering: mid-June to mid-September

Habitat and ecology: Common in sandy Black Oak savannas. Also found in partial shade on dune slopes near Lake Michigan.

Occurence in the Chicago region: native

Etymology: Galium comes from the Greek word gala, meaning milk, referring to the plants that are used to curdle milk. Pilosum means "covered with long, soft hair."

Author: The Morton Arboretum