PCA's Alien Plant Working Group Least Wanted: Alien Plant Invaders of Natural Areas

Trees

Tree-of-heaven (Ailanthus altissima) Updated
Silk tree (Albizia julibrissin)
Paper mulberry (Broussonetia papyrifera)
Australian pine (Casuarina equisetifolia)
Carrotwood (Cupaniopsis anacardioides)
Melaleuca (Melaleuca quinquenervia)
Chinaberry (Melia azedarach)

Princess tree (Paulownia tomentosa)
Amur corktree (Phellodendron amurense)
White poplar (Populus alba)
Strawberry guava (Psidium cattleianum)
Velvet tree (Miconia calvescens)
Common buckthorn (Rhamnus cathartica)
Black locust (Robinia pseudoacacia)
Salt cedar (Tamarix species)
Siberian elm (Ulmus pumila)

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http://www.nps.gov/plants/alien/trees.htm
Last updated: 01-Jul-2009