| Rudbeckia hirta |
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| Rudbeckia hirta flowerhead |
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| Scientific classification |
| Kingdom: |
Plantae |
| Clade: |
Tracheophytes |
| Clade: |
Angiosperms |
| Clade: |
Eudicots |
| Clade: |
Asterids |
| Order: |
Asterales |
| Family: |
Asteraceae |
| Genus: |
Rudbeckia |
| Species: |
R. hirta |
| Binomial name |
Rudbeckia hirta
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| Synonyms |
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- Brauneria serotina (Sweet) Bergmans
- Centrocarpha gracilis (Nutt.) D.Don ex G.Don
- Centrocarpha hirta (L.) D.Don ex G.Don
- Coreopsis hirta (L.) Raf.
- Helianthus hirtus (L.) E.H.L.Krause
- Obeliscotheca flava (T.V.Moore) Nieuwl. & Lunell
- Rudbeckia amplectens T.V.Moore
- Rudbeckia bicolor Nutt.
- Rudbeckia brittonii Small
- Rudbeckia discolor Elliott
- Rudbeckia divergens T.V.Moore
- Rudbeckia flava T.V.Moore
- Rudbeckia flexuosa T.V.Moore
- Rudbeckia floridana T.V.Moore
- Rudbeckia floridana var. angustifolia T.V.Moore
- Rudbeckia gracilis Nutt.
- Rudbeckia hirta var. annulata Clute
- Rudbeckia hirta var. bicolor Clute
- Rudbeckia hirta var. brittonii (Small) Fernald
- Rudbeckia hirta var. corymbifera Fernald
- Rudbeckia hirta f. dichrona Clute
- Rudbeckia hirta f. flavescens Clute
- Rudbeckia hirta f. gigantea Clute
- Rudbeckia hirta f. homochroma Steyerm.
- Rudbeckia hirta var. lanceolata (Bisch.) Core
- Rudbeckia hirta var. major Hook.
- Rudbeckia hirta var. monticola (Small) Fernald
- Rudbeckia hirta f. pleniflora Moldenke
- Rudbeckia hirta var. rubra Clute
- Rudbeckia hirta var. sericea (T.V.Moore) Fernald
- Rudbeckia hirta var. serotina (Nutt.) Core
- Rudbeckia hirta var. tubuliformis Burnham
- Rudbeckia hirta f. viridiflora Burnham
- Rudbeckia longipes T.V.Moore
- Rudbeckia monticola Small
- Rudbeckia sericea T.V.Moore
- Rudbeckia serotina Nutt.
- Rudbeckia serotina f. annulata (Clute) Fernald & B.G.Schub.
- Rudbeckia serotina var. corymbifera (Fernald) Fernald & B.G.Schub.
- Rudbeckia serotina f. dichrona (Clute) Moldenke
- Rudbeckia serotina f. flavescens (Clute) Moldenke
- Rudbeckia serotina f. frondosa (Clute) Moldenke
- Rudbeckia serotina f. gigantea (Clute) Moldenke
- Rudbeckia serotina f. homochroma (Steyerm.) Fernald & B.G.Schub.
- Rudbeckia serotina var. lanceolata (Bisch.) Fernald & B.G.Schub.
- Rudbeckia serotina f. novae-caesareae Oswald
- Rudbeckia serotina f. pleniflora (Moldenke) Fernald & B.G.Schub.
- Rudbeckia serotina f. pulcherrima (Farw.) Fernald & B.G.Schub.
- Rudbeckia serotina f. rubra (Clute) Fernald & B.G.Schub.
- Rudbeckia serotina var. sericea (T.V.Moore) Fernald & B.G.Schub.
- Rudbeckia serotina f. tubuliformis (Burnham) Fernald & B.G.Schub.
- Rudbeckia serotina f. viridiflora (Burnham) Fernald & B.G.Schub.
- Rudbeckia strigosa Nutt.
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Rudbeckia hirta, commonly called black-eyed Susan, is a North American flowering plant in the family Asteraceae. It grows to 1 metre (3+1⁄2 ft) tall with daisy-like yellow flower heads. There are numerous cultivars. It is toxic when ingested by cats, but was used medicinally by Native Americans. It is the state flower of Maryland.