| Family | RUBIACEAE |
| Genus species | Houstonia caerulea L. |
| Bibliography | Sp. Pl. 1: 105 (1753) |
| Native Range | e. Canada to nc. & e. USA |
| Primary Biome | Temperate |
| Habitat | grassland |
| Description | leaves small, crowded, ovate, to base tapered, basal leaves spathulate, finely ciliate, bright green, flowers solitary, tetramerous |
| Size | 5-10cm |
| Color | pale blue |
| Bloom | summer |
| Ca | - |
| Type | subshrub |
| Cultivation | mesic, slightly humous, sunny site alpine house, moist, rich, drained soil, sun |
| Propagation | seed in spring, barely covered, germ. 1-3 months, 10-16°C cuttings in late summer |
| Synonyms | Anotis caerulea (L.) G.Don Anotis gentianoides (Endl.) Walp. Hedyotis brachiata Miq. ex Hook.f. Hedyotis caerulea (L.) Hook. Hedyotis caerulea f. albiflora (Millsp.) Fosberg Hedyotis caerulea f. benkei Fosberg Hedyotis caerulea var. faxonorum (Pease & A.H.Moore) Fosberg Hedyotis gentianoides Endl. Houstonia caerulea f. albiflora Millsp. Houstonia caerulea var. elatior (Michx.) Pursh Houstonia caerulea var. faxonorum Pease & A.H.Moore Houstonia caerulea var. piersii Barbour Houstonia caerulea var. toxonorum Stevens Houstonia faxonorum (Pease & A.H.Moore) Fernald Houstonia grandiflora Raf. Houstonia linnaei Michx. Houstonia linnaei var. elatior Michx. Houstonia pusilla J.F.Gmel. Houstonia serpyllifolia Graham Oldenlandia caerulea (L.) A.Gray Poiretia erecta J.F.Gmel. |
| Territory | 7 Northern America 72 Eastern Canada (NBR New Brunswick, NFL Newfoundland, NSC Nova Scotia, QUE Québec) 74 North-Central U.S.A. (IOW Iowa, MSO Missouri, WIS Wisconsin) 75 Northeastern U.S.A. (CNT Connecticut, NWH New Hampshire, NWY New York, VER Vermont) 78 Southeastern U.S.A. (ALA Alabama, ARK Arkansas, KTY Kentucky, LOU Louisiana, MRY Maryland, MSI Mississippi, TEN Tennessee, VRG Virginia) |