Helianthus bolanderi

Helianthus bolanderi is a species of sunflower known by the common names Bolander's sunflower[1] and serpentine sunflower.[2] It is native to California and Oregon, where it grows mainly in mountainous areas, often in serpentine soils. It has been found from southwestern Oregon as well as in northern and central California as far south as Santa Cruz County, with reports of a few isolated populations in southern California (some of them from urban areas and very likely cultivated or escaped specimens).[3][4]

Helianthus bolanderi
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Helianthus
Species:
H. bolanderi
Binomial name
Helianthus bolanderi

This wild sunflower 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.[5]

References
  1. "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
  2. "Helianthus bolanderi". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 6 January 2016.
  3. Calflora taxon report, University of California, Helianthus bolanderi A. Gray Bolander's sunflower, serpentine sunflower
  4. Biota of North America Program 2014 county distribution map
  5. Flora of North America, Helianthus bolanderi A. Gray, 1865. Bolander’s sunflower


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