Pereskia aculeata: author Mill. Miller, Gard. dict. abr. ed. 4 (1754).

http://www.botanic-gardens-ljubljana.com/en/component/plants/pereskia-aculeata

http://www.floranordica.org/Review/-Review_public/accounts/Cactaceae.html 

http://plants.usda.gov/java/profile?symbol=peac2