Juniperus/Cypress and Sequoia sp.
This includes the mountain cedar and is considered one of the most potent allergens in parts of the United States. This particular species occurs in south central Oklahoma and Texas. The pollen becomes airborne and can be found in significant numbers in areas where it is not native. The pollination season is December and January with the highest concentration being the last week of December. The other junipers and cedars are common all over North America and when found in high concentrations they can cause allergic reactions. The yellow cypress is found in western coastal North America and the pollen causes hay fever when released in high numbers. There is a great deal of cross-reactivity among this group. People with an allergy to one species can develop reactions to other cedars.
Last Updated: 14 October 2009
The information presented here is designed to inform, not replace, the relationship that exists between a patient and a medical professional.