Rudbeckia grandiflora

Rudbeckia grandiflora, commonly called rough coneflower,[1] is a species of flowering plant in the aster family (Asteraceae). It is native to North America, where it is found primarily in the south-central United States, including a disjunct population in northwest Georgia.[2][3] The other populations farther east, all small and isolated, are believed to have originated from human introductions.

Rudbeckia grandiflora
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Rudbeckia
Species:
R. grandiflora
Binomial name
Rudbeckia grandiflora
(D. Don) J.F. Gmel. ex DC., 1836

Its typical natural habitat is in prairies and open woodlands.[4][5]

Rudbeckia grandiflora is a perennial from a woody base, growing to around 120 cm tall. It produces relatively large inflorescences, with 12-25 yellow ray flowers, each around 3-5 cm long. It blooms from late spring into summer.[4][5]

Taxonomy

Two varieties are recognized:[2][4]

  • R. grandiflora var. alismifolia - Stems glabrous or sparsely pubescent, with hairs ascending an less than 0.5 mm
  • R. grandiflora var. grandiflora - Stems with regular spreading hairs over 1 mm
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References
  1. "Rudbeckia grandiflora". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 24 January 2019.
  2. Alan Weakley (2015). "Flora of the Southern and Mid-Atlantic States".
  3. "Rudbeckia grandiflora". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014. Retrieved 24 January 2019.
  4. Rudbeckia grandiflora Flora of North America
  5. Diggs, George; Lipscomb, Barney; O'Kennon, Robert (1999). Flora of North Central Texas. Botanical Research Institute of Texas. p. 402.
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