Looks like a white Petunia to me.
https://www.google.com/search?q=dyckia&hl=en&prmd=imvns&tbm=isch&tbo=u&source=univ&sa=X&ei=3ZnJTqGAGImatwffwO3bCw&sqi=2&ved=0CDYQsAQ&biw=1901&bih=889#hl=en&tbm=isch&sa=1&q=white+petunia&pbx=1&oq=white+petunia&aq=f&aqi=g2g-m1g-S5g-mS1&aql=&gs_sm=s&gs_upl=169124l175979l0l179019l15l15l1l0l0l0l257l2098l3.9.2l14l0&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=66878526cec973b8&biw=1901&bih=889
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