Hieracium venosum (Robin's plantain, rattlesnakeweed, or rattlesnake hawkweed) is a species of hawkweed in the tribe Cichorieae within the family Asteraceae. It is widespread and common in south-central Canada (Ontario) and the eastern United States (from Michigan east to Maine and south as far as Florida and Mississippi).[3][4][5] Its common name comes from the fact that environments it is found in are typically also a home to rattlesnakes.[6]

Hieracium venosum is a hairy herb up to 45 cm (18 inches) tall, with most of the leaves crowded around the base of the stem. One plant can produce as many as 20 flower heads, each with 30–45 yellow ray flowers but no disc flowers.[7] It is a perennial that blooms from May to September, and prefers shady conditions with dry, sandy soil.[6]

  • Hieracium venosum flowering, with leaves crowded around the base.
    Hieracium venosum flowering, with leaves crowded around the base.
  • Leaves detail.
    Leaves detail.
  • Flower detail.
    Flower detail.
  • 6 yellow ray flowers.
    6 yellow ray flowers.

References

  1. ^ Britton, N.L., and A. Brown. 1913. Illustrated flora of the northern states and Canada. Vol. 3: 332.
  2. ^ The Plant List, Hieracium venosum L.
  3. ^ United States Department of Agriculture, Natural Resources Conservation Service. "Hieracium venosum L., Rattlesnakeweed".
  4. ^ Wildflowers of the United States, Gerry Williamson. "Rattlesnake Weed, Rattlesnake Hawkweed, Veiny Hawkweed - Hieracium venosum".
  5. ^ Biota of North America Program 2014 county distribution map
  6. ^ a b "Hieracium venosum (Rattlesnakeweed)". Lady Bird Johnson Wildflower Center. 3 August 2017. Retrieved 14 August 2019.
  7. ^ Flora of North America, Hieracium venosum Linnaeus, 1753.

Media related to Pilosella venosa at Wikimedia Commons