long-leaved bluet, longleaf summer bluet (Houstonia longifolia)

Houstonia longifolia is a species in the Houstonia genus. It is commonly known as long-leaved bluet, longleaf summer bluet This name is accepted name for the species in the family Rubiaceae subfamily Rubioideae, tribe Spermacoceae, . . This species is found in Alabama, Alberta, Arkansas, Florida, Georgia, Illinois, Indiana, Kentucky, Manitoba, Maryland, Minnesota, Mississippi, Missouri, New York, Oklahoma, Ontario, Saskatchewan, Tennessee, Texas, Vermont, Virginia, Wisconsin.