Formation of embryo directly from nucellus and integument is

Formation of embryo directly from nucellus and integument is Adventitive polyembryony.
Polyembryony, is a condition in which two or more embryos develop from a single fertilized egg, forming what in humans is known as identical twins.
A common phenomenon in many plant and animal species, polyembryony occurs regularly in the nine-banded armadillo, which usually gives birth to four identical young.
In adventive polyembryony, there is the formation of extra embryos due to sporophytic budding.