How might a pollen allergy manifest when drinking a tea derived from related plant material?

An allergic reaction could range from mild irritation in the mouth to a more severe systemic response

Individuals managing known allergies must exercise caution with herbal teas because the source material—flowers, roots, seeds, and leaves—can trigger reactions in susceptible persons. If someone has a pollen allergy, they may react adversely to a tea made from a related botanical species, even though the substance is being consumed internally rather than inhaled. This internal exposure can illicit a typical allergic response. The severity is variable; it might manifest locally as simple irritation or inflammation within the mouth or throat upon contact, or it could escalate into a more serious, widespread systemic reaction affecting other bodily systems.