''Adeia whitneyi'', common name Whitney's bristleweed, is a North American species of

shrub A shrub or bush is a small to medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees by their multiple ...

in the daisy family. It has been found only in the state of

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

in the western United States.Biota of North America Program 2014 county distribution map
/ref> ''Adeia whitneyi'' is a perennial herb or subshrub up to tall. The plant produces numerous flower heads in a dense, elongated array at the top of the plant. Each head contains 8-10 disc flowers but no ray flowers. The species sometimes grows on serpentine soils.Flora of North America, ''Hazardia whitneyi'' (A. Gray) Greene, 1896. Whitney’s bristleweed
/ref> The species was first named ''Haplopappus whitneyi'' in 1868 by

Asa Gray Asa Gray (November 18, 1810 – January 30, 1888) is considered the most important American botany, botanist of the 19th century. His ''Darwiniana'' (1876) was considered an important explanation of how religion and science were not necessaril ...

. In 2021 Guy L. Nesom placed the species into the new genus '' Adeia'' and elevated its former subspecies ''discoidea'' to a distinct species, ''

Adeia discoidea ''Adeia discoidea'' is a species of flowering plant in the sunflower family, Asteraceae. It is a perennial herb or subshrub native to California and Oregon Oregon ( , ) is a U.S. state, state in the Pacific Northwest region of the Unite ...

''.Nesom, G.L. 2021. Two new North American genera segregated from ''Hazardia'' (Asteraceae: Astereae). ''Phytoneuron'' 2021-39: 1–36. Published 13 September 2021. ISSN 2153-733X

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Photo of herbarium specimen at Missouri Botanical Garden, collected in California in 1866, isotype of ''Hazardia whitneyi/Aplopappus whitneyi''
Astereae Endemic flora of California Plants described in 1868 Flora without expected TNC conservation status {{Astereae-stub