Bedstraw \Bed"straw`\, n.

1. Straw put into a bed. --Bacon.

2. (Bot.) A genus of slender herbs, usually with square stems, whorled leaves, and small white flowers.

Our Lady's bedstraw, which has yellow flowers, is Galium verum.

White bedstraw is G. mollugo.

Source: Webster's Revised Unabridged Dictionary (1913)