Zygophyllaceae
Tribulus terrestris

Puncture Vine

Mat prostrate to 6 ft. across. Leaves divided, leaflets oval, opposite, 6–12. Flowers small, yellow. Fruit splits into 5 nutlets, each nutlet with 2–4 hard sharp spines. Grows in dry disturbed soils. Mediterranean. This pernicious weed causes flat tires and injured feet, and is named caltrop after a 4-spiked weapon used on the ground to obstruct moving armies.

  • Rarity: Common
  • Flowering Time: All Summer
  • Life Cycle: Annual
  • Height: mat
  • Habitat: Disturbed, Shrub-Steppe
  • Found In:
  • Native: No