''Leptosyne hamiltonii'', the Mt. Hamilton coreopsis or Mt. Hamilton tickseed, is a rare California

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

of ''

Leptosyne ''Leptosyne'' is a genus of flowering plants in the family Asteraceae. It includes eight species native to California, Arizona, and northwestern Mexico. Species Eight species are accepted. *''Leptosyne bigelovii'' *''Leptosyne californica'' *' ...

'' in the family

Asteraceae Asteraceae () is a large family (biology), family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the Order (biology), order Asterales. The number of species in Asteraceae is rivaled only by the Orchi ...

. It is found only in a small region including Mount Hamilton and the

Diablo Range The Diablo Range is a mountain range in the California Coast Ranges subdivision of the Pacific Coast Ranges in northern California, United States. It stretches from the eastern San Francisco Bay Area at its northern end to the Salinas Valley a ...

in the southwestern

San Francisco Bay Area The San Francisco Bay Area, commonly known as the Bay Area, is a List of regions of California, region of California surrounding and including San Francisco Bay, and anchored by the cities of Oakland, San Francisco, and San Jose, California, S ...

( Alameda, Santa Clara, and Stanislaus Counties).

Description

''Leptosyne hamiltonii'' typically grows tall or sometimes taller when in bloom. The foliage is low growing, producing bright golden yellow colored

flower Flowers, also known as blooms and blossoms, are the reproductive structures of flowering plants ( angiosperms). Typically, they are structured in four circular levels, called whorls, around the end of a stalk. These whorls include: calyx, m ...

heads and red purplish tinted peduncles. The foliage is deeply cut with a thin ferny shape.Elmer, Adolph Daniel Edward 1906. Botanical Gazette 41(5): 323–324
as ''Leptosyne hamiltonii'' It can be found blooming from March to May in California, where plants are found growing from above sea level.Flora of North America, ''Coreopsis hamiltonii''
/ref>

References

External links

Jepson eFlora treatment: ''Leptosyne hamiltonii''

United States Department of California Plants Profile

''Coreopsis hamiltonii'' — University of California Calphotos Photo gallery
hamiltonii Endemic flora of California Natural history of the California chaparral and woodlands Natural history of the California Coast Ranges Diablo Range Natural history of the San Francisco Bay Area Natural history of Santa Clara County, California Plants described in 1906 Taxa named by Adolph Daniel Edward Elmer {{Coreopsideae-stub