Galium obtusum
Family: Rubiaceae
blunt-leaf bedstraw, wild madder
Galium obtusum image
Emmet J. Judziewicz  
Galium obtusum image
University of Wisconsin - Madison (WIS-VP)  
Etymology: Galium: from Greek word gala, "milk," and alluding to the fact that certain species were used to curdle milk
Plants: erect to matting, perennial, 8"-32" tall forb, many branches throughout; stems smooth except for the densely bearded nodes
Leaves: main leaves in whorls of 4, mostly blunt tipped, more than 1/10" wide
Flowers: white, 4-parted, 1/8" wide, lobes longer than wide; inflorescence a short, mostly terminal, 1-2 times-branched cluster of 3-5 flowers; blooms May-July
Fruits: smooth
Habitat: moist to wet; swamps, thickets, meadows
Conservation Status: Native