'Moonlight' is a beautiful Aporophyllum hybrid by Harry Johnson of Johnson's Cactus Gardens, registered with the Epiphyllum Society of America (ESA) in 1960.
 
'Moonlight' has creamy white petals suffused with a peach pink. Three rows of petals. Small four to six ribbed growth with short spines and prominent areoles.
Flower is at the lower end of Large (18-23cm)   Around 15-18cm really but if you stretched it tip to tip, it might get to 23cm.
 
The cutting you receive  is from the same plant as the photos you see above