''Trifolium jokerstii'' is a rare species of

clover Clovers, also called trefoils, are plants of the genus ''Trifolium'' (), consisting of about 300 species of flowering plants in the legume family Fabaceae originating in Europe. The genus has a cosmopolitan distribution with the highest diversit ...

known by the common names Jim's clover and Butte County golden clover. It is

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

to Butte County, California, where it is known from eight or nine occurrences near Oroville.California Native Plant Society Rare Plant Profile
/ref> It grows in seasonally moist habitat, such as vernal pools, pastures, and ephemeral creeks.The Nature Conservancy
/ref> 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. It was named for the California botanist Jim Jokerst.CalFlora Botanical Names
/ref> 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

stipule In botany, a stipule is an outgrowth typically borne on both sides (sometimes on just one side) of the base of a leafstalk (the petiole (botany), petiole). They are primarily found among dicots and rare among monocots. Stipules are considered part ...

s. The

inflorescence In botany, an inflorescence is a group or cluster of flowers arranged on a plant's Plant stem, stem that is composed of a main branch or a system of branches. An inflorescence is categorized on the basis of the arrangement of flowers on a mai ...

is a head of at least five golden yellow flowers on a bowl-like base of

bract In botany, a bract is a modified or specialized leaf, associated with a reproductive structure such as a flower, inflorescence axis or cone scale. Bracts are usually different from foliage leaves in size, color, shape or texture. They also lo ...

References

External links

Calflora: ''Trifolium jokerstii'' (Jim's clover)Jepson Manual eFlora (TJM2) treatment of ''Trifolium jokerstii''Species Accounts: Butte County Golden Clover

UC CalPhotos gallery: ''Trifolium jokerstii''
jokerstii Endemic flora of California Natural history of Butte County, California Natural history of the Central Valley (California) Plants described in 1998 Critically endangered flora of California {{Trifolieae-stub