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Tribulus bimucronatus is a common desert plant. Here u can see its fruit.
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Tribulus pentandrus is a creeping herb of the extreme desert. Relative to the other local Tribulus species, it has rather large flowers.
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Tribulus pentandrus is to be found in Israel only in the dar south of the country. Here u can see the fruit, I have posted the yellow flwoers some days ago.
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Tribulus is a desert and tropical genus. This one is a desert species, occuring from the dead sea to the Gulf of Eilat. The flowers are almost inconspicuus, the fruits and winged, hairy and spiny.