Synonyms
Echinospermum deflexum var. americanum A.Gray
Lappula deflexa subsp. americana (A.Gray) Cochrane
Lappula americana Rydb.
Lappula deflexa var. americana (A.Gray) Greene
Hackelia deflexa subsp. americana (A.Gray) Hultén
Hackelia americana (A.Gray) Fernald