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Pereskia
http://cactiguide.com/Pereskia.htm
Images of several species.
Pereskia aculeata
http://florawww.eeb.uconn.edu/acc_num/198502660.html
Pereskia grandifolia
http://www.dipbot.unict.it/orto/0117-1.html
image
Pereskia sacharosa
http://florawww.eeb.uconn.edu/acc_num/199000077.html