There are hundreds of different terpenes found in the marijuana plant, but some of the most common primary terpenes include:

1. Myrcene: This terpene is known for its musky, earthy aroma and its sedative effects. It is often found in high concentrations in Indica strains, and is believed to contribute to the "couch-lock" effect that is commonly associated with these strains.
2. Limonene: This terpene is known for its citrusy aroma and its mood-elevating effects. It is commonly found in high concentrations in Sativa strains and is believed to contribute to the strains' ability to reduce anxiety and improve mood.
3. Pinene: This terpene is known for its piney aroma and its bronchodilator and anti-inflammatory effects. It is often found in high concentrations in Sativa strains and is believed to contribute to the strains' ability to promote focus and concentration.
4. Linalool: This terpene is known for its floral, lavender aroma and its sedative effects. It is commonly found in high concentrations in Indica strains and is believed to contribute to the strain's ability to promote relaxation and reduce anxiety.
5. Caryophyllene: This terpene is known for its spicy, woody aroma and its anti-inflammatory effects. While it's not exclusive to Indica or Sativa strains, it is found in higher concentrations in both and is believed to contribute to the strains' ability to promote a sense of well-being.
6. Humulene: This terpene is known for its earthy, woody aroma and its anti-inflammatory and appetite-suppressing effects. It's not as commonly found as other terpenes, but it's still present in some strains.

This is not an exhaustive list, as many other terpenes present in marijuana, each with its unique properties and characteristics, which is why a variety of strains and their terpene profiles can be very different.