Rudbeckia hirta

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Rudbeckia hirta
Rudbeckia hirta flowerhead
Scientific classification
Kingdom:Plantae
(unranked):Angiosperms
(unranked):Eudicots
(unranked):Asterids
Order:Asterales
Family:Asteraceae
Genus:Rudbeckia
Species:R. hirta
Binomial name
Rudbeckia hirta
L.
 
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Rudbeckia hirta
Rudbeckia hirta flowerhead
Scientific classification
Kingdom:Plantae
(unranked):Angiosperms
(unranked):Eudicots
(unranked):Asterids
Order:Asterales
Family:Asteraceae
Genus:Rudbeckia
Species:R. hirta
Binomial name
Rudbeckia hirta
L.

Rudbeckia hirta, black-eyed Susan, is a species of flowering plant in the family Asteraceae, native to the central United States. It is one of a number of plants with the common name black-eyed Susan. Other common names for this plant include: brown-eyed Susan, brown Betty, gloriosa daisy, golden Jerusalem, Poorland daisy, yellow daisy, and yellow ox-eye daisy.

Description[edit]

It is an upright annual (sometimes biennial or perennial) growing 30–100 cm (12–39 in) tall by 30–45 cm (12–18 in) wide. It has alternate, mostly basal leaves 10–18 cm long, covered by coarse hair, with stout branching stems and daisy-like, composite flowers appearing in late summer and early autumn. In the species, the flowers are up to 10 cm (4 in) in diameter, with yellow ray-florets circling conspicuous brown or black, dome-shaped disc-florets.[1] However, extensive breeding has produced a range of sizes and colours, including oranges, reds and browns.[2]

Etymology[edit]

The genus name honors Olaus Rudbeck, who was a professor of botany at the University of Uppsala in Sweden and was one of Linnaeus's teachers. The specific epithet refers to the trichomes (hairs) occurring on leaves and stems.[3]

Varieties[edit]

There are four varieties:

Cultivation[edit]

R. hirta is widely cultivated in parks and gardens, for summer bedding schemes, borders, containers, wildflower gardens, prairie-style plantings and cut flowers. Numerous cultivars have been developed, of which 'Indian Summer'[4] and 'Toto'[5] have gained the Royal Horticultural Society's Award of Garden Merit. Other popular cultivars include 'Double Gold' and 'Marmalade'.

Gloriosa daisies are tetraploid cultivars having much larger flowers than the species, often doubled or with contrasting markings on the petals. They were first bred by Alfred Blakeslee of Smith College by applying colchicine to R. hirta seeds; Blakeslee's stock was further developed by W. Atlee Burpee and introduced to commerce at the 1957 Philadelphia Flower Show.[6] Gloriosa daisies are generally treated as annuals or short-lived perennials and are typically grown from seed, though there are some named cultivars.

Symbolism and uses[edit]

The black-eyed Susan was designated the state flower of Maryland in 1918.[7] The Preakness Stakes in Baltimore, Maryland has been termed "The Run for the Black-Eyed Susans" because a blanket of chrysanthemums, decorated to look like black-eyed Susans, is traditionally placed around the winner's neck (actual black-eyed Susans are not in season during the Preakness).

The black-eyed Susan which means “Justice” makes a very nice cut-flower with a vase life up to 10 days.[8]

Butterflies are attracted to Rudbeckia hirta when planted in large color-masses.[9]

Traditional medicine[edit]

The roots but not seedheads of Rudbeckia hirta can be used much like the related Echinacea purpurea. It is an astringent used as in a warm infusion as a wash for sores and swellings.[citation needed] The Ojibwa used it as a poultice for snake bites[10] and to make an infusion for treating colds and worms in children. The plant is diuretic and was used by the Menominee and Potawatomi.[11][12] Juice from the roots had been used as drops for earaches.[13]

The plant contains anthocyanins.[14]

Gallery[edit]

Notes[edit]

  1. ^ Floridata: Rudbeckia hirta.
  2. ^ RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN 1405332964. 
  3. ^ Andy's Northern Ontario Wildflowers: Native Meadow Wildflowers. Black-eyed Susan.
  4. ^ "RHS Plant Selector - Rudbeckia hirta 'Indian Summer'". Retrieved 2 June 2013. 
  5. ^ "RHS Plant Selector - Rudbeckia hirta 'Toto'". Retrieved 2 June 2013. 
  6. ^ Lacy, Allen (July 21, 1988). "Gloriosa, the Eliza Doolittle of Daisies". New York Times. Retrieved 2013-10-22. 
  7. ^ "Fiscal and Policy Notes (HB 345)". Department of Legislative Services - Maryland General Assembly. 2010. Retrieved 2010-03-13. 
  8. ^ "Black Eyes Susan Wildflower". 
  9. ^ Schillo, Rebecca (2011). "Native Landscaping Takes Root in Chicago". In Cummings, Nina. In The Field: 13. 
  10. ^ Black-Eyed Susan
  11. ^ Herbs
  12. ^ Rudbeckia hirta
  13. ^ Moerman. D. Native American Ethnobotany Timber Press. Oregon. 1998 ISBN 0-88192-453-9
  14. ^ Cat.Inist

References[edit]