Trifolium jokerstii

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Trifolium jokerstii

Critically Imperiled (NatureServe)
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
Order: Fabales
Family: Fabaceae
Subfamily: Faboideae
Tribe: Trifolieae
Genus: Trifolium
Species: T. jokerstii
Binomial name
Trifolium jokerstii
Vincent & R.Morgan

Trifolium jokerstii is a rare species of clover known by the common names Jim's clover[1] and Butte County golden clover. It is endemic to Butte County, California, where it is known from eight or nine occurrences near Oroville.[2] It grows in seasonally moist habitat, such as vernal pools, pastures, and ephemeral creeks.[3] It was previously included within the description of Trifolium barbigerum as an odd yellow-flowered variant of a mostly purple-pink-flowered species, and was elevated to species status in 1998.[4] It was named for the California botanist Jim Jokerst.[5]

This is an annual herb with a decumbent or erect, hairless stem. The leaves are made up of oval blades up to about 3 centimeters long which are marked with a white or purplish chevron, and large, lance-shaped, toothed stipules. The inflorescence is a head of at least five golden yellow flowers on a bowl-like base of bracts.


  1. ^ "Trifolium jokerstii". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 15 December 2015. 
  2. ^ California Native Plant Society Rare Plant Profile
  3. ^ The Nature Conservancy
  4. ^ Vincent, M. A. and R. Morgan. (1998). Trifolium jokerstii (Leguminosae, Papilionoideae), a new species from Butte County, California. Novon 8:1 91-3.
  5. ^ CalFlora Botanical Names

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