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Tribulus terrestris
Ground cover herbaceous plant with green compound 3 to 4 inch long leaves. Height from ground 3 to 6 inches. Five petaled bright yellow flower with a slightly lighter yelow stamen and pistil,
Open lawn area in a poor fertility area.
By having this ID'ed I learned that the sharp little "land mine" that I had in my sandle was from this plant.
Thank you @Andrea Lim. Because of your ID I realized the "land mine" I had in my sandal was from this. Missed it.