| Family | RUBIACEAE |
| Genus species | Houstonia calycosa A.Gray |
| Bibliography | Contr. U.S. Natl. Herb. 6: 739 (1901) |
| Native Range | w. Appalachian Mts. |
| Primary Biome | Temperate |
| Habitat | steppes |
| Description | stems erect, glabrous, 4-angular, leaves narrow, lanceolate, acute, glabrous, stipules membranous, flowers terminal, pedicellate, in ramose panicle, calyx lobes lanceolate |
| Size | 15-30cm |
| Color | purple |
| Bloom | summer |
| Ca | |
| Type | subshrub |
| Cultivation | sunny site with a deep, drained soil alpine house, rich, drained soil, sun |
| Propagation | seed in spring, barely covered, germ. 1-3 months, 10-16°C cuttings in late summer |
| Synonyms | Hedyotis calycosa Shuttlew. ex A.Gray Hedyotis lanceolata Poir. Hedyotis purpurea var. calycosa (A.Gray) C.Mohr Houstonia purpurea var. calycosa A.Gray |
| Territory | 7 Northern America 74 North-Central U.S.A. (ILL Illinois, MSO Missouri, OKL Oklahoma) 75 Northeastern U.S.A. (INI Indiana, OHI Ohio, VER Vermont) 78 Southeastern U.S.A. (ALA Alabama, TEN Tennessee) |