Tribulus terrestris

This is a weedy plant introduced from southern Africa. The spiny fruits, which are the origin of the common name "goats heads", can easily puncture tires.

Fruit near my apartment in Las Cruces, 8/22/04.

Flowering stem near my apartment in Las Cruces, 8/22/04.

A flower near my apartment in Las Cruces, 8/22/04.