Houstonia caerulea L. | | a | | Houstonia caeruleaL. | |
Houstonia serpyllacea (Schltdl.) C. L. Sm. ex Greenm. | Arcytophyllum serpyllaceum (Schltdl.) Terrell | | | Houstonia serpyllacea(Schltdl.) C. L. Sm. ex Greenm. | Arcytophyllum serpyllaceum(Schltdl.) Terrell |
Houstonia purpurea L. | | a | | Houstonia purpureaL. | |
Houstonia purpurea L. var. montana (Small) Terrell | | a | i | Houstonia purpureaL. var.montana (Small) Terrell | |
Houstonia montana Small | Houstonia purpurea L. var. montana (Small) Terrell | | | Houstonia montanaSmall | Houstonia purpureaL. var.montana (Small) Terrell |
Houstonia canadensis Willd. | | a | | Houstonia canadensisWilld. | |
Houstonia rubra Cav. | | a | | Houstonia rubraCav. | |
Houstonia wrightii A. Gray | | a | | Houstonia wrightiiA. Gray | |
Houstonia micrantha (Shinners) Terrell | | a | | Houstonia micrantha(Shinners) Terrell | |
Houstonia nigricans (Lam.) Fernald | Stenaria nigricans (Lam.) Terrell | | | Houstonia nigricans(Lam.) Fernald | Stenaria nigricans(Lam.) Terrell |
Houstonia pusilla Schöpf | | a | | Houstonia pusillaSchöpf | |
Houstonia longifolia Gaertn. | | a | | Houstonia longifoliaGaertn. | |
Houstonia spp. | | a | | Houstonia spp. | |
Houstonia purpurea L. var. purpurea | | a | i | Houstonia purpureaL. var.purpurea | |