Opuntia ammophila, the devil's-tongue, is a species of prickly pear cactus in Florida. Individuals typically occur singly and do not generally form dense thickets. O. ammophila was once considered a variety of O. humifusa; however, it is a distinct species. Among their many differences, O. ammophila has gray-green cladodes rather than green or grass-green. Description Opuntia ammophila can grow to the height of humans, and large plants with thick trunks were encountered 100 years ago. However, now it is unusual to find plants that are even 1 m tall. However, even small plants form a single trunk. The flower buds are distinct with recurved tepals, and the flowers themselves are light-yellow with cream-colored stigmas. The plant is infrequently encountered in mid-Florida. References ammophila Cacti of the United States Endemic flora of Florida Taxa named by John Kunkel Small