| Cactaceae | Opuntia mesacantha ssp. lata | Prickly-pear | Coastal dunes and scrub, sandhills, borders of pine flatwoods, scrub, coastal islands (FL, GA, SC), riverine sands. | Ssp. lata is restricted to the outer Atlantic and Gulf Coastal Plains and the FL peninsula: NC south to s. FL, west to s. MS. | 
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| Cactaceae | Opuntia mesacantha ssp. mesacantha | Longspine Eastern Prickly-pear | Granite outcrops, coastal dunes and scrub, longleaf pine sandhills, pine forests in sandy soils, Gulf Coast barrier Islands (AL, FL panhandle, MS), riverine sands. | S. NJ south to sc. GA, c. AL, c. and n. MS, and se. TN; disjunct in FL Panhandle, s. AL, s. MS; disjunct in w. LA. Throughout the southern Piedmont, Atlantic and Gulf Coastal Plain, but absent from the FL peninsula forming a disjunction between the Gulf and Atlantic coasts, as in O. drummondii, with which this subspecies is often associated, at least along the coast and in certain Piedmont populations on granite. See McAvoy (2021) for details of DE occurrence. | 
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