Griffiths, Bulletin of the Torrey Botanical Club 43(2): 92, 1916
Holotype; Isotype; Painting (Smithsonian Institution); Painting; Painting (Smithsonian Institution) NOTE: the holotype specimen is remarkable because it contains two different cladode types. Only the cladode on the left conforms with the original description of this Opuntia and plants found near the type locality. Also, the cladode on the left agrees with the isotype specimen. Therefore, we accept the pad on the left as the correct holotype. The pad on the right is unidentified but may be O. magenta or O. gomei, more southerly species.
What is Opuntia anahuacensis?
Opuntia anahuacensis is a prickly pear cactus of sandy soils associated with the Gulf of Mexico, and this has earned it the name beach prickly pear or beach Opuntia. The plants are 30-60 cm tall, but multiple plants can form large horizontal, impenetrable thickets several meters across.
The cladodes are about 10-15 cm wide and up to 25 cm long; they are obovate with suggestions of a neck. Some elliptical cladodes are reminiscent of elongate ping-pong paddles because of their neck. Pads of this prickly pear can have multiple spines or essentially no spines. But, there is usually no more than 1-2 major spines per areole on this Opuntia. If there is a spine, it is porrect. If there is a second spine, it is deflexed.
The flower buds are generally long and tapered. The stigma is white. Fruit is pyriform, up to 5-7 cm long and sometimes deeply pitted. O. anahuacensis co-occurs with O. bentonii but that latter species is decidedly more spiny and has yellow stigmas.
Ploidy is unknown.
We found this Opuntia in sandy areas on Galveston Island, Texas, and several locations on Bolivar Peninsula, Texas. It is anecdotally reported from Anahuac, TX. Another report places the plant in southwestern Louisiana. Additionally, isolated populations of this prickly pear have been found as much as 60 km inland growing in deep, sandy soils along waterways. O. anahuacensis may occur along the many secluded miles of the south Texas Gulf Coast, but this is not documented by us. Overall then, it could be widespread.
O. anahuacensis is not commonly noticed as a distinct Opuntia species, and it seems unrecognized by many Texas botanists. O. anahuacensis may have been mistaken for O. stricta, which was reported along the upper Texas Gulf Coast. The two opuntias are different, and we have never observed O. stricta in Texas. Perhaps a sighting of O. anahuacensis was misreported as O. stricta.
Though it is associated with the beach areas, this prickly pear does well in gardens where it can form a large, wide plant if not kept in check. It may be cold-hardy to USDA hardiness zone 8a and perhaps colder areas if protected.