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Ageratina aristei
Native to montane forests of the Andes in Colombia. This species is recognized by its rounded corymbs of dense, white flowers composed of numerous long, thread-like styles and stigmas, giving them a fluffy appearance. Like other members of the genus, this species contains pyrrolizidine alkaloids, which are toxic if ingested in large amounts and serve as a natural deterrent to herbivores. Photographed in Colombia.