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 Secretariat of the Pacific Regional Environment Programme

The PIER database is focused on plant species that are known to have been introduced to the Pacific region including the Pacific Rim. It provides listings and descriptions of plant species that threaten ecosystems and also listed many other invasive and potentially invasive plant species present in and around the Pacific region

 Secretariat of the Pacific Regional Environment Programme

Verbesina encelioides, a gray, golden crownbeard, is a sunflower-like herbaceous annual plant ranging in height from 0.3 to 1.7 m with showy yellow flowers. It is native to the southwestern United States, the Mexican Plateau, and other parts of tropical America. Its invasive characteristics include high seed production (as many as 300–350 seeds per flower and multiple flowers per plant), seed dormancy, ability to tolerate dry conditions, and possible allelopathic effects. Many other Pacific islands with similar habitats could be invaded by V. encelioides