Helianthus_exilis

<i>Helianthus exilis</i>

Helianthus exilis

Species of sunflower

Helianthus exilis is a species of sunflower[1] known by the common name serpentine sunflower. It is endemic to northern California (from Siskiyou County south to Napa County and Nevada County), where it grows mainly in mountainous areas, often in serpentine soils.[2]

Quick Facts Helianthus exilis, Conservation status ...

Helianthus exilis is an erect annual reaching heights over a meter (40 inches)). It has a hairy, rough stem with leaves lance- or oval-shaped, usually pointed, sometimes serrated along the edges, and 3 to 15 centimeters (1.2-6.0 inches) long. The inflorescence holds one or more flower heads, and each plant may have many inflorescences growing along the full length of the stem. The flower head has a cup of long, pointed phyllaries holding an array of bright yellow ray florets each one to two centimeters (0.4-0.8 inches) long around a center of yellow to dark purple or reddish disc florets. The achene is 3 to 5 millimeters (0.12-0.20 inches) long.[3]

References

  1. [1]
    The Plant List, Helianthus exilis A.Gray
  2. [2]
    Calflora taxon report, University of California, Helianthus exilis Gray serpentine sunflower
  3. [3]
    Flora of North America, Helianthus exilis A. Gray, 1865. Serpentine sunflower


Stub icon

This Heliantheae article is a stub. You can help Wikipedia by expanding it.
Share this article:

This article uses material from the Wikipedia article Helianthus_exilis, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.