Annona glabra is a tropical fruit tree in the family Annonaceae, in the same genus as the soursop and cherimoya. Common names include pond apple, alligator apple (so called because American alligators often eat the fruit), swamp apple, corkwood, bobwood, and monkey apple. The tree is native to Florida in the United States, the Caribbean, Central and South America, and West Africa. It is common in the Everglades. The A. glabra tree is considered an invasive species in Sri Lanka and Australia. It grows in swamps, is tolerant of saltwater, and cannot grow in dry soil. Description The trees grow to up to 12 m. They have narrow, gray trunks and sometimes grow in clumps. The leaves are ovate to oblong, each with an acute tip, 8–15 cm long and 4–6 cm broad with a prominent midrib. The upper surface is light to dark green. Leaves of the A. glabra are said to have a distinct smell, similar to green apples, that can distinguish it from mangroves. The fruit is oblong through spherical and apple-sized or larger, 7–15 cm long and up to 9 cm diameter, and falls when it is green or ripening yellowish. It disperses by floating to new locations, and it is food for many animal species such as wild boar. Reproduction begins around two years of age. A fruit contains 100 or more convex, light yellow-brown seeds, about 1 cm long. A. glabra flowers have a short life-span, and have a diameter of 2–3 cm. The flowers have three outer petals as well as three inner petals. Compared to the pale yellow or cream color of the petals, the inner base of the A. glabra flower is a bright red. Its pollen is shed as permanent tetrads. Ecology A. glabra thrives in wet environments. The seeds and fruit of this plant can be dispersed during wet seasons where they fall into swamps and rivers. This allows the seeds and fruits to spread to coastlines. A 2008 study found that A. glabra seeds can withstand floating in salt water and fresh water for up to 12 months. About 38% of those seeds can then germinate in soil, though A. glabra roots do not do well with constant flooding. Another study in 1998 found that even under intense flooding, the 12-month lifespan of A. glabra seedlings was unaffected; the growth rate of A. glabra trees did decrease however