Isocoma acradenia is a North American species of flowering plant in the family Asteraceae known by the common name alkali goldenbush.
| Isocoma acradenia | |
|---|---|
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Isocoma |
| Species: | I. acradenia
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| Binomial name | |
| Isocoma acradenia (Greene) Greene 1894
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| Synonyms[1] | |
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Synonymy
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It is native to the Southwestern United States (California, Nevada, Utah, Arizona) and northwestern Mexico (Sonora, Baja California). It grows in arid, sandy areas, particularly mineral-rich areas such as alkali flats and gypsum soils.[2][3][4][5][6]
Description
editIsocoma acradenia is a bushy subshrub reaching maximum heights of slightly over 1 m (39 in). It produces erect, branching stems which are a shiny pale yellowish white, aging to a yellow-gray.[7]
Along the tough, hard-surfaced stems are linear or oval-shaped glandular leaves 1–6 cm (0.39–2.36 in) long, sometimes with stumpy teeth along the edges. They are gray-green and age to pale gray or tan.[7]
The inflorescences along the top parts of the stem branches are clusters of four or five flower heads.[8] Each head is a capsule encased in bumpy, glandular greenish phyllaries bearing many golden yellow disc florets at its mouth. Each disc floret is somewhat cylindrical and protruding.[7]
The fruit is an achene a few millimeters long, with a yellowish pappus adding another few millimeters.[7]
- Isocoma acradenia var. acradenia - Salt scrub, often with creosote - Arizona, California, Nevada, Sonora
- Isocoma acradenia var. bracteosa (Greene) G. L. Nesom - salt flats - southern Central Valley in California
- Isocoma acradenia var. eremophila (Greene) G. L. Nesom - sandy soils, dunes, etc. - Arizona, California, Nevada, Utah, Baja California, Sonora).
References
edit- ^ a b The Plant List, Isocoma acradenia (Greene) Greene
- ^ C.Michael Hogan, ed. 2010. Isocoma acradenia. Encyclopedia of Life
- ^ Biota of North America Program 2014 county distribution map
- ^ a b Calflora taxon report, University of California, Isocoma acradenia (E. Greene) E. Greene, Desert isocoma, alkali goldenbush
- ^ a b SEINet, Southwestern Biodiversity, Arizona chapter
- ^ Nesom, G.L. 1991. Taxonomy of Isocoma (Compositae: Astereae). Phytologia 70(2): 69–114 includes distribution map on page 72
- ^ a b c d e Flora of North America Editorial Committee (ed.). "Isocoma acradenia". Flora of North America North of Mexico (FNA). New York and Oxford: Oxford University Press – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
- ^ Jepson Manual Treatment, University of California, (TJM93) of Isocoma acradenia
External links
edit- Calflora Database: Isocoma acradenia (Alkali goldenbush, Desert isocoma)
- Jepson Manual eFlora (TJM2) treatment of Isocoma acradenia
- UC CalPhotos gallery − Isocoma acradenia
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