Contains 7 accepted taxa overall.
Characteristics
Classification
Citation
HOUSTONIA Linnaeus, Sp. Pl. 105. 1753.
-
TYPE: Houstonia caerulea Linnaeus Lectotypified by Standley, in Britton, N. Amer. Fl. 32: 24. 1918.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Houstonia longifolia | LONGLEAF SUMMER BLUET | Native | ||
| Houstonia micrantha | SOUTHERN BLUET | Native | ||
| Houstonia nigricans var. floridana | FLORIDA DIAMONDFLOWERS | Native | ||
| Houstonia nigricans var. nigricans | DIAMONDFLOWERS | Native | ||
| Houstonia procumbens | INNOCENCE; ROUNDLEAF BLUET | Native | ||
| Houstonia purpurea | LARGE SUMMER BLUET; VENUS' PRIDE | Native | ||
| Houstonia pusilla | TINY BLUET | Native FACU (NWPL) |
Identification Key
1. Leaf blade 0.2-2(8) mm wide, 10-40 times longer than wide; seeds not crateriform (at most with a shallow indistinct depression)
2
1. Leaf blade 2-20 mm wide (at least larger ones), 1.5-15 times longer than wide; seeds crateriform with an obvious ventral depression or cavity
3
2. Corolla 3-5(6) mm long; capsule subglobose, 1.2-2.5 mm long, 1-1.3 times longer than wide
2. Corolla (2.5)3-8 mm long; capsule turbinate, 1.5-4.5 mm long, 1.3-2 times longer than wide
3. Leaves 2-15 mm long
4
3. Leaves 15-45 mm long (at least larger ones)
6
4. Perennial; stems prostrate, sometimes rooting at nodes, internodes usually >4 per stem
4. Annual; stems erect to spreading, not rooting at nodes, internodes 2-5 per stem
5
5. Calyx lobes 0.8-1.2 times as long as corolla tube; corolla white, 2-5.5 mm long, the tube 0.8-2.5 mm long
5. Calyx lobes 0.2-1.2 times as long as corolla tube; corolla purple, violet, pink, to white, 3.5-10(12.5) mm long, the tube 2-5.5 mm long
6. Lower or median cauline leaves 0.3-8.5 mm wide, linear to elliptic
6. Basal or median cauline leaves 3-35(45) mm wide, ovate to narrowly lanceolate
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| Anotis | Anotis de Candolle, Prodr. 4: 431. 1830. | TYPE: = Panetos Rafinesque 1820. | |
| Chamisme | Chamisme (Rafinesque) Nieuwland, Amer. Midl. Naturalist 4: 92. 1915. | BASIONYM: Houstonia Linnaeus, subg. Chamisme Rafinesque, Ann. Gen. Sci. Phys. 5: 227. 1820. | TYPE: Chamisme purpurea (Linnaeus) Nieuwland (Houstonia purpurea Linnaeus) Lectotypified by Terrell, Syst. Bot. Monogr. 48: 19. 1996. |
| Panetos | Panetos Rafinesque, Ann. Gen. Sci. Phys. 5: 227. 1820. | TYPE: Panetos rotundifolius (Michaux) Nieuwland (Houstonia rotundifolia Michaux) | |
| Poiretia | Poiretia J. F. Gmelin, Syst. Nat. 2: 213, 263. 1791, nom. rej. vs. Poiretia Cavanilles 1807. | TYPE: Poiretia erecta J. F. Gmelin Lectotypified by Terrell, Syst. Bot. Monogr. 48: 19. 1996. | |
| Stenaria | Stenaria (Rafinesque) Terrell, Sida 19: 592. 2001. | BASIONYM: Houstonia Linnaeus, subg. Stenaria Rafinesque, Ann. Gén. Sci. Phys. 5: 226. 1820. | TYPE: Houstonia rupestris Rafinesque Lectotypified by Terrell, Sida 19: 592. 2001. |