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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Campanulids
Ordo: Asterales

Familia: Asteraceae
Subfamilia: Asteroideae
Tribus: Madieae
Subtribus: Madiinae
Genus: Holocarpha
Species: Holocarpha obconica
Subspecies: H. o. subsp. autumnalis – H. o. subsp. obconica

Holocarpha obconica (J.C.Clausen & D.D.Keck) D.D.Keck

Aliso. a series of papers on the native plants of California. [Title originally El Aliso] 4:111. 1958
USDA, ARS, Germplasm Resources Information Network. Holocarpha obconica in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 07-Oct-06.

Holocarpha obconica, commonly known as the San Joaquin tarweed, is a North American plant species in the sunflower family. It is endemic to (found only in) California, primarily in the Central Valley and adjacent regions.[2]

The epithet "obconica" means "obconical," in other words, shaped like a cone but with the widest part farthest from the base. Achenes of H. obconica are obconical. The plant is a resin-containing herb up to 120 cm (4 feet) tall. It produces numerous flower heads, each head containing 4–9 yellow ray flowers surrounding 11–21 small yellow disc flowers, the disc flowers having yellow or brown anthers.[3][4]

The Plant List, Holocarpha obconica (J.C.Clausen & D.D.Keck) D.D.Keck
CalFlora taxon report, University of California, Holocarpha obconica (J. Clausen & Keck) Keck, San Joaquin tarweed . accessed 11.14.2011.
Flora of North America, Holocarpha obconica (J. C. Clausen & D. D. Keck) D. D. Keck, 1958.
Clausen, Jens Christian & Keck, David Daniels. 1935. Madroño 3(1): 7, Hemizonia obconica

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