Simplify the following text for a Grade 7 native English-speaking person.
Original: Within the genus Prunus , it is classified with the peach in the subgenus Amygdalus , distinguished from the other subgenera by the corrugated shell ( endocarp ) surrounding the seed .
Simplified: Within the genus Prunus , it is classified in the subgenus Amygdalus . Amygdalus is told apart from other subgenera by the wavy seed shell .