This is a list[1] of edible plants in the family Cactaceae.
Carnegiea gigantea, the Saguaro,
Cereus repandus - California and Florida
genus Corryocactus (also known as Erdisia), the tasty berrylike
C. brevistylis, C. pulquiensis, and C. erectus
Coryphantha
C. robbinsorum and C. recurvata.
genus Echinocereus ("Strawberry Cactus")
E. engelmannii, E. bonkerae, E. boyce-thompsonii
E. enneacanthus, E. cincerascens, E. stramineus
E. dasyacanthus, E. fendleri and E. fasciculatus
E. brandegeei, E. ledingii and E. nicholii
E. engelmannii ("Strawberry Vanilla")
genus Echinopsis
South American species
E. (or T.) atacamensis, E./T. coquimbana and E./T. schickendanzii
genus Epiphyllum, the Orchid cactus
E. anguliger (also called Phyllocactus darrahii, said to be like gooseberries)
genus Epithelantha (the fruit of all species said to be edible)
genus Ferocactus
Ferocactus hamatacanthus
F. histrix ("borrachitos") and F. latispinus ("pochas")
genus Harrisia (of Florida and the Caribbean), the "Prickly Apples"
NOTE: The following 5 are said to be "endangered endemic" :
H. aboriginum, H.simpsonii, H. adscendens, H fragrans and H. eriophora
Argentinian H. balsanae
H. undatus and H. triangularis (aka "Dragon Fruits") - SE Asia and China
genus Mammillaria ("chilitos" as they look like tiny red chili peppers)
M. applanata, M. meiacantha, M. macdougalii, M. lasiacantha
M. grahamii, M. oliviae, M. mainiae, M. microcarpa, M. thornberi and many others
Myrtillocactus geometrizans ("garambulos", taste like less-acid cranberries)
Cultivated prickly pear grown for food
genus Opuntia, the prickly pears
Opuntia ficus-indica
Opuntia matudae
Opuntia fragilis[2]
genus Pachycereus,
Pachycereus pringlei, the Cardon
P. schottii, the Senita and P. weberi, the Candelabro
genus Peniocereus,
Peniocereus greggii, the Arizona Queen of the Night
P. johnstonii and P. serpentinus
genus Pereskia
P. aculeata, the "Barbados gooseberry"
P. guamacho
genus Stenocereus (quite sweet, but prone to ferment; hence the "agria" [="sour"]))
S. fricii ("Pitayo de aguas"), S. griseus ("Pitayo de Mayo"), S. gummosus ("Pitahaya agria"
S. pruinosus ("Pitayo de Octubre"), S. montanus ("Pitaya colorada")
S. queretaroensis ("Pitaya de Queretaro"), S. standleyi ("Pita Marismena"), S. stellatus ("Xoconostle")
S. thurberi ("Organ Pipe Cactus", "Pitayo Dulce") and S. treleasi ("Tunillo")
https://en.wikipedia.org/wiki/List_of_edible_cacti