The botanical directory
From familiar garden flowers to species you have yet to meet. Explore the flowering plant tree through accepted scientific names, botanical families, and synonyms.
- Accepted species
- 347,476
- Synonym names
- 710,971
- Botanical families
- 430
- Genera
- 13,895
Find a flower. Follow its family.
Search scientific names or try a familiar florist name, like rose or peony.
Scientific names and synonyms are searchable from two characters. Familiar florist names link to their broader genus; common names are not available for every species.
14,256 species in RubiaceaeShowing 4,777–4,800
Clear filtersPhotos show the identified species; cultivars and commercial forms can vary. Related genus guides cover other plants in the same group. Name authors credit the botanists behind a scientific name; “L.” stands for Carl Linnaeus. Swipe across the table to see family and guide links.
| Photo | Species | Family & genus | Flower guides |
|---|---|---|---|
| No photo yet | Homollea septentrionalisName author: De BlockAccepted species | RubiaceaeHomollea genus | No guide yet |
| No photo yet | Houstonia acerosaName author: (A.Gray) Benth. & Hook.f.Accepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia caeruleaName author: Carl Linnaeus (L.)Accepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia canadensisName author: Willd.Accepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia correlliiName author: (W.H.Lewis) TerrellAccepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia croftiaeName author: Britton & RusbyAccepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia humifusaName author: (Engelm. ex A.Gray) A.GrayAccepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia longifoliaName author: Gaertn.Accepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia macvaughiiName author: (Terrell) Govaerts ex BorhidiAccepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia micranthaName author: (Shinners) TerrellAccepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia ouachitanaName author: (E.B.Sm.) TerrellAccepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia palmeriName author: A.GrayAccepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia parvifloraName author: Holz. ex Greenm.Accepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia procumbensName author: (Walter ex J.F.Gmel.) Standl.Accepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia prostrataName author: BrandegeeAccepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia purpureaName author: Carl Linnaeus (L.)Accepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia pusillaName author: SchoepfAccepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia roseaName author: (Raf.) TerrellAccepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia rubraName author: Cav.Accepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia serpyllifoliaName author: Michx.Accepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia sharpiiName author: TerrellAccepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia spellenbergiiName author: (G.L.Nesom & Vorobik) TerrellAccepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia subviscosaName author: (C.Wright ex A.Gray) A.GrayAccepted species | RubiaceaeHoustonia genus | No guide yet |
| No photo yet | Houstonia teretifoliaName author: TerrellAccepted species | RubiaceaeHoustonia genus | No guide yet |
A living reference.
A documented starting point.
Taxonomy changes as plants are studied. This directory preserves the accepted names and synonym relationships in a specific World Flora Online release, so you can trace every entry to its source.
View the June 2026 source datasetWhat is included?
All 347,476 accepted species classified under Angiosperms in this snapshot, plus 710,971 names treated as synonyms of those species. Flowering trees, grasses, and other less familiar flowering plants belong here too.
Is this every flower that has ever existed?
No complete list of every historical or undiscovered species exists. This collection excludes unresolved names, subspecies and varieties as separate records, non-flowering plants, and most cultivated forms. It is not a complete fossil or cultivar register.
Can I order these flowers?
A botanical record does not establish cut-flower availability or suitability for an arrangement. Our 1230 florist guides cover commercial flowers, specialty garden cuts, and foliage, with design notes, photos, and calculator links. Calculator selection uses that florist collection; other ingredients can be entered as custom items.
Taxonomy: World Flora Online Consortium · CC0 public domain · Published June 21, 2026. Photographs and editorial florist guides have separate credits.