Holocarpha obconica

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]

Holocarpha obconica
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Genus:
Holocarpha
Species:
H. obconica
Binomial name
Holocarpha obconica
Synonyms[1]
  • Hemizonia obconica J.C.Clausen & D.D.Keck 1935
  • Hemizonia vernalis D.D.Keck
  • Holocarpha obconica subsp. autumnalis D.D.Keck

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]

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