Presentation after plant poisoning depends entirely on the specific plant consumed. In general, large quantities of the plant need to be consumed (or the plant needs to be concentrated into an extract or brewed into a tea) in order to affect symptoms. Clinicians should make every effort to identify the involved plant, but treatment should focus on presenting symptoms rather than expected or anticipated consequences of plant consumption.[33][34] Asymptomatic patients who present for evaluation after consuming a potentially poisonous plant should be observed for several hours after ingestion, and efforts should be made to correctly identify the plant. Some highly toxic plants may require more intensive evaluation and observation (e.g., poison or water hemlock, lily of the valley, autumn crocus, Glory lily, mayapple, jequirity bean, yew leaves).

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