Simplify the following text for a Grade 6 native English-speaking person.
Original: Asclepias physocarpa ( also known as Gomphocarpus physocarpus , commonly balloonplant , balloon cotton-bush or swan plant ) is a species of milkweed .
Simplified: Swan Plant ( Asclepias physocarpa ) is a species of milkweed plant . It is also known as Balloonplant and Balloon Cotton-Bush .