Helianthus silphioides

Helianthus silphioides
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Helianthus
Species:
H. silphioides
Binomial name
Helianthus silphioides
Nutt. 1841
Synonyms[1]
  • Helianthus atrorubens var. pubescens Kuntze
  • Helianthus kentuckiensis McFarland & W.A.Anderson

Helianthus silphioides is a North American species of sunflower known by the common names rosinweed sunflower or Ozark sunflower. It is native to the central United States, primarily in the Ozarks and the Tennessee Valley with additional populations north into Kentucky and Illinois and south as far as Louisiana, Mississippi and Alabama.[2]

Helianthus silphioides grows in open locations. It is an perennial herb up to 300 cm (10 feet) tall. Leaves are broadly egg-shaped. One plant usually produces 3-15 flower heads, each containing 8–13 yellow ray florets surrounding 75 or more red disc florets.[3]

A 2004 Illinois conservation assessment listed Helianthus silphioides as critically imperiled within the state.[4] The species is also considered endangered within Kentucky,[5] likely due to habitat loss of open oak woodlands and barrens. Throughout the remained of its range, it is considered apparently secure or conservation status is unknown.[6]

References

  1. ^ The Plant List, Helianthus silphioides Nutt.
  2. ^ Biota of North America Program 2014 county distribution map
  3. ^ Flora of North America, Helianthus silphioides Nuttall, 1841. Rosinweed sunflower
  4. ^ Molano-Flores 2004
  5. ^ Jones 2005
  6. ^ Molano-Flores 2004


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