Limonene is a prominent terpene found in cannabis as well as--you guessed it--lemons (and other citrus.) It has a bright, awakening effect, and is often found in sativas and sativa hybrids. It also has antifungal and antibacterial properties! Naturally, a garden variety dragon would probably stop by for a taste of some Super Lemon Haze...
Find out more about Limonene at: