|Other names:||goathead, bullhead, caltrop, Mexican sandbur, Texas sandbur, puncture vine, goatheads, sandbur|
Low-growing, spreading weed with fernlike leaves and an extensive root system. Flowers have 5 petals. Seed pods have 5 segments, each with 2 spines that are sharp enough to penetrate shoes and tires. Tolerates hot, compacted soils.