*Tribulus terrestris Puncture Vine, Caltrop
Long creeping stems and shiny pinnate
leaves lie flat on the ground. Yellow flowers have five petals, five-lobed
stigma. Blooms all summer. Hard star-shaped seedpods have sharp,
penetrating spines. Occasional in flat gravel washes, dirt roads,
recently disturbed ground.
FAMILY: Zygophyllaceae (Caltrop Family)