The plants of the genus Graptopetalum are Crassulaceae from Central America,  they are characterized by rosettes with thick, fleshy and aqueous leaves. Even the stems are quite thick and succulent, but the most obvious part of the plant are definitely the rosettes. Leaves may take more or less dark colors ranging in shades of green or silver-gray, they are rather large and end with a tip. The flowers are usually white, with small reddish spots, composed of five petals united only at the base; in some species they have  a bright pink color (g. bellum). They grow on a stem that starts from the center of a leave  rosette, usually in small umbrellas that can support 3, 4 or more flowers. Aesthetically they remind the Echeveria but they differ from it because of their small dimensions (depending on the species they can grow from 5 to 40 cm maximum) and for the conformation of the flower.

Source: Giromagi Cactus and Succulents

Scientific classification

Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Core eudicots
Order: Saxifragales
Family: Crassulaceae
Genus: Graptopetalum

                         – Wikipedia.