The plant is known from the southern California Coast Ranges, southwestern Sierra Nevada, Transverse Ranges, and the Mojave and Colorado deserts. It is widespread in a number of habitat types from Merced and Inyo Counties south to San Diego County.
Coreopsis bigelovii is annual herb that produces one to many stems with erect, stemlike inflorescences 10 to 30 centimeters tall. The leaves are divided into narrow lobes which are sometimes subdivided, and most of the leaves are located at the base of the plant.
The many inflorescences bear solitary flower heads, each with a bulbous involucre of rough phyllaries. The flower head has a center of many yellow disc florets and a fringe of five to ten ray florets up to 2.5 centimeters (1 inch) long.
The fruit is a small achene. The fruit of the ray floret is rough and bumpy and lacks a pappus; that of the disc floret is more slender, shiny, edged with hairs, and tipped with a pappus of scales.
Coreopsis bigelovii may be distinguished from Coreopsis calliopsidea by its linear outer phyllaries. Coreopsis calliopsidea has triangular to ovate outer phyllaries. The outer phyllaries of Coreopsis californica are narrowly lanceolate and have yellow or red hairs at their base.
- John L. Strother (2006). "Coreopsis Linnaeus, Sp. Pl. 2: 907. 1753; Gen. Pl. ed. 5, 388. 1754". In Flora of North America Editorial Committee. Magnoliophyta: Asteridae (in part): Asteraceae, part 3. Flora of North America. 21. Oxford University Press. pp. 185–198.
- The Plant List, Coreopsis bigelovii (A.Gray) H.M.Hall
- Mojave Desert Wildflowers, Pam MacKay, 2nd Ed., p. 206
- Biota of North America Program 2014 county distribution map
- "Leptosyne bigelovii". in Jepson Flora Project (eds.) Jepson eFlora. Jepson Herbarium; University of California, Berkeley. 2018. Retrieved 2018-07-06.
- Sullivan, Steven. K. (2018). "Leptosyne bigelovii". Wildflower Search. Retrieved 2018-07-06.
- Calflora taxon report, University of California, Leptosyne bigelovii (A. Gray) A. Gray, Bigelow coreopsis
- Flora of North America, Coreopsis bigelovii (A. Gray) Voss
- "Leptosyne calliopsidea". in Jepson Flora Project (eds.) Jepson eFlora. Jepson Herbarium; University of California, Berkeley. 2018. Retrieved 2018-07-06.
- "Leptosyne californica". in Jepson Flora Project (eds.) Jepson eFlora. Jepson Herbarium; University of California, Berkeley. 2018. Retrieved 2018-07-06.
- University of Michigan @ Dearborn, Native American Ethnobotany
- Media related to Coreopsis bigelovii at Wikimedia Commons
- Coreopsis bigelovii — Calphotos Photo gallery, University of California
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