Most bedstraws have flowers with four petals, but Clayton's bedstraw has mostly three-petalled flowers. A closely related species, small bedstraw (Galium trifidum) also has three-petalled flowers.
- Family: bedstraw (Rubiaceae)
- Habitat: swamps, wet soil
- Height: 4-10 inches
- Flower size: 1/16 inch across
- Flower color: white
- Flowering time: June to August
- Origin: native