Here are seeds of fringed sage (Artemisia frigida). The strongly aromatic plant is common in western North America, and has been used by Native Americans for treating colds, heartburn, indigestion, fever, headache and wounds. These small seeds have dimensions of about 0.4 by 0.9 mm.
Equipment used: Canon EOS Rebel T5i with a standard zoom lens (EF-S 18-55 mm) on a 49 mm long extension tube.