Chattahoochee River National Recreation Area is administered by the National Park Service, US Department of the Interior, and comprises 2618 ha (6470 acres) in 15 land units along 77.3 km (48 mi) of the river corridor in Georgia, from the Buford Dam on Lake Lanier (near Sugar Hill) south to Peachtree Creek in Atlanta. A floristic survey was conducted to provide Park Service personnel with a vouchered plant species checklist, supplemented with salient information such as relative abundance, locality data, and general community type. Twelve collecting trips conducted in 2006–2007 yielded 570 species and three varieties of vascular plants, including 169 species not previously vouchered for the park. Identifications of specimens in the park herbarium from prior surveys were also verified and incorporated into the annotated list, resulting in a total of 827 plant species vouchered for the park flora. The five largest families were Asteraceae (108 spp.), Poaceae (66 spp.), Fabaceae (51 spp.), Cyperaceae (44 spp.), and Rosaceae (30 spp.). According to state rankings, 13 rare plant species occurred within the study area and 19% of the noncultivated flora was exotic. Clinopodium gracile, native to Asia, was verified from Georgia for the first time. A vouchered checklist of vascular plants and descriptions of the general plant communities are included, as well as a list of unvouchered species previously reported from the park.
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Vol. 114 • No. 957