Simplify the following text for a Grade 7 native English-speaking person.
Original: Common names include Horseweed , Canadian Horseweed , Canadian Fleabane , Coltstail , Marestail and Butterweed .
Simplified: Canadian Horseweed ( Conyza canadensis ) is species of plant . It is also known as Canadian Fleabane , Coltstail , and Marestail .