Simplify the following text for a Grade 9 native English-speaking person.
Original: Camellia is a genus of flowering plants in the family Theaceae , native to eastern and southern Asia from the Himalaya east to Japan and Indonesia .
Simplified: Camellia , the camellias , is a genus of flowering plants in the family Theaceae . They are native to eastern and southern Asia , from the Himalaya east to Korea and Indonesia .