The Las Vegas Sun has an article about an up-and-coming tamarisk species making its way around Lake Mead. The athel tree (Tamarix aphylla) is evergreen, grows quite a bit larger than other saltcedars, and until recently was thought to be sterile and therefore not a threat. Following the removal of over 20,000 trees by the National Park Service, that opinion has likely changed (apparently Australia doesn't like it much either).
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