Annona glabra, universally known as the pond apple, alligator apple, or swamp apple, is a tropical, semi-deciduous tree in the Annonaceae family. It is native to the coastal regions of Florida, the Caribbean, Central and South America, and West Africa. The genus name *Annona* is likely derived from the Latin annona ("yearly harvest"), while the species epithet glabra is Latin for "smooth," referencing its hairless leaves. Historically, this tree has been a fixture of wetland ecosystems, often found growing in swampy areas, mangrove borders, and coastal riverbanks where it is uniquely tolerant of both freshwater flooding and saline conditions.

The plant is an evergreen or semi-deciduous tree, typically growing 3 to 12 meters tall with a slender, sometimes buttressed, grey-barked trunk. It features glossy, dark green, ovate leaves that emit a distinct, green-apple-like aroma when crushed. Its flowers are solitary and showy, with three thick, creamy-yellow outer petals and three smaller, reddish-spotted inner petals. The fruit is a smooth, ovoid, or spherical berry that ripens from green to a yellowish-orange. Inside, the flesh is a pale yellow to orange, custard-like pulp that contains numerous convex, light-brown seeds. Annona glabra is highly efficient at dispersing via water; its fruit can float for up to 12 months in saltwater or freshwater without losing its ability to germinate, an adaptation that has made it a problematic invasive species in wetland ecosystems outside its native range, notably in northern Queensland, Australia, and Sri Lanka.

The pond apple holds a controversial reputation as a food. While the ripe, sweet-scented yellow pulp is technically edible for humans, it is generally considered inferior to its commercial cousins like the soursop (A. muricata) or sugar apple (A. squamosa). Its flavor is often described as a subtle, sometimes bland, blend of honeydew melon, passion fruit, and occasionally a hint of menthol. Culinary use is largely localized; it is occasionally prepared into jams, jellies, or fresh fruit drinks, particularly in regions like the Maldives. Because of its variable quality and texture—which can range from pleasant to insipid or "sawdust-like"—it has never achieved widespread commercial success. In Florida, it was historically used by Indigenous populations, such as the Seminole, for food, while its lightweight, cork-like wood served as functional material for fishing floats.

Nutritionally and biochemically, the pond apple is complex and requires caution. The pulp is a source of dietary fiber and vitamins, but it shares the genus-wide characteristic of containing potentially neurotoxic compounds. The seeds, bark, and leaves are known to be insecticidal and contain potent acetogenins, alkaloids, and other secondary metabolites. Scientific literature suggests that frequent, long-term consumption of various Annona species—including their herbal teas—may be linked to a risk of atypical Parkinson’s disease and other forms of cognitive impairment due to the presence of these compounds, which are capable of crossing the blood-brain barrier. Consequently, the seeds are strictly non-edible and are historically noted for being used to poison fish or as a topical treatment for lice.