Missouri Weed Seeds

Zygophyllaceae (Caltrop family)

Broadleaf plant family

This relatively small plant family has about 30 members, but only two actually occur in Missouri. Of these two, puncturevine is the more common.

Puncturevine
Tribulus terrestris
 

For an idea of relative seed size, each photo contains a millimeter ruler. The distance between increments is 1 mm.