[Wikipedia] Native range: Casuarina equisetifolia, common names Coastal She-oak or Horsetail She-oak[1] (sometimes referred to as the Australian pine tree or whistling pine tree outside Australia), is a she-oak species of the genus Casuarina. The native range extends throughout Southeast Asia, Northern Australia and the Pacific Islands; including Thailand, Myanmar, Vietnam, Malaysia, Singapore, Brunei, Indonesia, East Timor, and the Philippines (where it is known as agoho pine),[2] east to Papua New Guinea, French Polynesia, New Caledonia, and Vanuatu, and south to Australia (north of Northern Territory, north and east Queensland, and north-eastern New South Wales).[3] Populations are also found in Madagascar, but it is doubtful if this is within the native range of the species (contributed by Mary Ann Machi)

[www.fs.usda.gov] Invasiveness: TAXONOMY: The scientific name of the sheoak genus is Casuarina (Casuarinaceae). Three species of sheoak are common in the United States. All will be treated in this report because of their similar status as invader species and across-the-board efforts to eradicate the genus from the continent. "Sheoak" refers to the genus. The species covered in this review are: Casuarina cunninghamiana Miq., river sheoak Casuarina equisetifolia L., beach sheoak Casuarina glauca Seiber, gray sheoak. These species hybridize with each other. FEDERAL LEGAL STATUS: NO_ENTRY OTHER STATUS: All 3 species of sheoak are list as noxious weeds (prohibited aquatic plants, Class 1) in Florida [16]. (contributed by Mary Ann Machi)