Isocoma arguta

Isocoma arguta is a rare species of flowering plant in the family Asteraceae known by the common name Carquinez goldenbush. It has been found only in Solano and Contra Costa Counties in California, where it grows in the Sacramento-San Joaquin River Delta.[3] It is a resident of Suisun Marsh. It thrives on alkali flats and other mineral-rich soils.

Isocoma arguta

Critically Imperiled  (NatureServe)[1]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Isocoma
Species:
I. arguta
Binomial name
Isocoma arguta
Greene 1894
Synonyms[2]
  • Haplopappus venetus var. argutus (Greene) D.D. Keck
  • Isocoma veneta var. arguta (Greene) Jeps.

Description

Isocoma arguta is a compact subshrub reaching about half a meter-1.5 feet (20-60 inches) tall and wide with erect, multibranched stems. The hairy stems bear small gray-green, nonfleshy, glandular leaves each less than 2 centimetres (0.79 in) long.[4]

The inflorescences hold clusters of thick, knobby flower heads. Each head is a capsule of layered greenish glandular phyllaries with an array of 10-13 cylindrical, protruding golden yellow disc florets at one end. There are no ray florets.[4]

References
  1. "NatureServe Explorer 2.0".
  2. Tropicos, Isocoma arguta Greene
  3. Calflora taxon report, University of California, Isocoma arguta E. Greene, Carquinez goldenbush,
  4. Flora of North America, Isocoma arguta Greene, 1894. Contra Costa jimmyweed , Carquinez or suisun goldenbush


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