Synonyms of Rudbeckia hirta (29) (Updated on 2-15-21): 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, Rudbeckia amplectens T.V.Moore, Rudbeckia brittonii Small, Rudbeckia discolor Elliott, Rudbeckia gracilis Nutt., Rudbeckia hirta var. annulata Clute, Rudbeckia hirta var. bicolor Clute, Rudbeckia hirta var. brittonii (Small) Fernald, Rudbeckia hirta f. dichrona Clute, Rudbeckia hirta f. flavescens Clute, Rudbeckia hirta f. gigantea Clute, Rudbeckia hirta f. homochroma Steyerm., Rudbeckia hirta var. major Hook., Rudbeckia hirta var. monticola (Small) Fernald, Rudbeckia hirta var. tubuliformis Burnham, Rudbeckia hirta f. viridiflora Burnham, Rudbeckia monticola Small, Rudbeckia serotina f. annulata (Clute) 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 f. novae-caesareae Oswald, Rudbeckia serotina f. tubuliformis (Burnham) Fernald & B.G.Schub., Rudbeckia serotina f. viridiflora (Burnham) Fernald & B.G.Schub.
Rudbeckia hirta L. is the correct and accepted scientific name for this species of Rudbeckia. The genus and species were named and described as such by Carl von Linnaeus in the second volume of the first edition of Species Plantarum in 1753.
Plants of the World Online lists 24 accepted species in the Rudbeckia genus (as of 2-15-21 when I last updated this page). It is a member of the plant family Asteraceae with 1,679 genera. Those numbers could change as updates are made (and likely will).
THERE ARE SEVERAL LINKS AT THE BOTTOM OF THE PAGE FOR FURTHER READING.
We have A LOT of Black-Eyed Susan on the farm and you can see them just about anywhere they are allowed to grow. They are a Missouri native wildflower and the USDA Plant database shows they are native everywhere in the US except Arizona and Nevada. They are also native to most of Canada. I wonder how they skipped Arizona and New Mexico. Rudbeckia hirta is the state flower of Maryland.
Whenever I see any of these plants in the garden or flower beds I just let them grow. Never hurts to have a few pollinators here and there for bees and butterflies.
Family: Asteraceae (Compositae)
Origin: Native to most of the United States and Canada at least.
Zones: USDA Zones 3a-9b (-40 to 25° F)
Size: 24-36” tall x 12-24” wide
Soil: Average, well-drained soil
Tolerates: Heat, drought, and just about any soil type.
Maintenance: Can deadhead to increase more flower production.
Rudbeckia hirta is very self-seeding so deadheading when they are in your flower beds may be a good idea. There are many popular cultivars of Rudbeckia hirta and I grew three in 2017.
Various Native American tribes used Rudbeckia hirta as an herbal remedy for colds, flu, infections, swelling, and snakebite. Apparently, all parts of this plant are NOT edible, though.
I had started getting more into the identification of wildflowers on the farm which sometimes required multiple photos of various parts of the plants.
Rudbeckia hirta seems pretty self-explanatory for the most part, but there are three other varieties of Rudbeckia hirta besides the species. Rudbeckia hirta var. angustifolia, Rudbeckia hirta var. floridana, and Rudbeckia hirta var. pulcherrima are the other three. Besides that, the Missouri Department of Conservation website says there are nine species of Rudbeckia in Missouri. From a distance, you cannot tell the difference.
I suppose I should take more photos of the distinguishing features of this species to properly determine what it, or they, really are. Hmmm…
I will continue to add more photos and information as time goes by. I am sure they aren’t going anywhere soon. 🙂
I hope you enjoyed this page and maybe found it useful. If you have any comments, questions or suggestions, I would like to hear from you. Please click on “like” if you visited this page. It helps us bloggers stay motivated. 🙂 You can check out the links below for further reading. The links take you directly to the genus and species of this plant.