The pods of Yellow trefoil are shaped as here shown and contain but a single seed. Magnified four diameters
Alfalfa Seed Pods
Alfalfa has a spiral pod of two or three turns, often containing five or six seeds. Magnified four diameters
Sweet Clover Pods
Magnified four diameters
Bur Clover Seed Pods
The seeds are enclosed in a coiled pod which is covered with bristly projections as shown above. Magnified four diameters