You selected Houstonia purpurea var. tenuifolia (Nutt.) A.Gray. This is a synonym for:

Accepted scientific name:
Houstonia longifolia var. tenuifolia (Nutt.) Alph.Wood (accepted name) 1 literature reference for Houstonia longifolia var. tenuifolia (Nutt.) Alph.Wood
Synonyms:
Chamisme tenuifolia (Nutt.) Nieuwl. (synonym) 1 literature reference for Chamisme tenuifolia (Nutt.) Nieuwl.
Hedyotis longifolia var. tenuifolia (Nutt.) Torr. & A.Gray (synonym) 1 literature reference for Hedyotis longifolia var. tenuifolia (Nutt.) Torr. & A.Gray
Hedyotis nuttalliana Fosberg (synonym) 1 literature reference for Hedyotis nuttalliana Fosberg
Hedyotis purpurea var. tenuifolia (Nutt.) Fosberg (synonym) 1 literature reference for Hedyotis purpurea var. tenuifolia (Nutt.) Fosberg
Houstonia purpurea var. tenuifolia (Nutt.) A.Gray (synonym) 1 literature reference for Houstonia purpurea var. tenuifolia (Nutt.) A.Gray
Houstonia tenuifolia Nutt. (synonym) 1 literature reference for Houstonia tenuifolia Nutt.
Oldenlandia purpurea var. tenuifolia (Nutt.) A.Gray ex Chapm. (synonym) 1 literature reference for Oldenlandia purpurea var. tenuifolia (Nutt.) A.Gray ex Chapm.
Common names: -
Classification:
Plantae
Phylum Magnoliophyta
Class Magnoliopsida
Order Rubiales
Family Rubiaceae
Genus Houstonia
Species Houstonia longifolia
Distribution: SE. U.S.A. (Appalachian Mts.)
Additional data: -
Source database: World Checklist of Selected Plant Families, 27 Nov 2009
Latest taxonomic scrutiny: Govaerts R., 11-Nov-2003
Online resource: http://apps.kew.org/wcsp/namedetail.do?accepted_id=100367&repSynonym_id=-9998&name_id=100367&status=true
CoL taxon LSID: urn:lsid:catalogueoflife.org:taxon:f64c8058-29c1-102b-9a4a-00304854f820:ac2010