Pistachio, (Pistachio Vera), small tree of the cashew family (Anacardiaceae) and its edible seeds, grown in dry lands in warm or temperate climates. The pistachio tree is believed to be indigenous to Iran. It is widely cultivated from Afghanistan to the Mediterranean region and in California.  

Pistachios likewise have the most noteworthy phytosterol content among nuts, which seem to assist with bringing down blood cholesterol levels..