cocklebur is a large-seeded annual. If you get it, you better get rid of it or you are in
Seed capsules (left) contain two seeds with different dormancy characteristics. This is an example of somatic polymorphism: the same plant produces seed with different characteristics.
Spotted stem and distinctive leaf shape.
Red stems, light green flowering capsules, large leaves.
flowering, barbed, capsules.
Yet more, another seedling.
An outline of a seedling.
Still yet another outline of a seedling.