Biology:Dimeresia
| Dimeresia | |
|---|---|
| |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Subfamily: | Asteroideae |
| Tribe: | Chaenactideae |
| Genus: | Dimeresia A.Gray |
| Species: | D. howellii
|
| Binomial name | |
| Dimeresia howellii A.Gray
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| Synonyms[1] | |
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Dimeresia is a monotypic genus in the sunflower family containing the single species Dimeresia howellii, known by the common name doublet.[2][3][4]
Distribution
This uncommon plant is endemic to an area of the Great Basin region in the western United States, in northeastern California , southeastern Oregon, southwestern Idaho, and northwestern Nevada.[2][5][6][7]
It grows in dry volcanic soils, primarily on the Modoc Plateau volcanic plain, at elevations of 1,500–2,400 metres (4,900–7,900 ft).[5]
Description
Dimeresia howellii is a very tiny annual flowering plant rarely exceeding 4 centimeters in height or width. It forms a small tuft on the ground with several oval-shaped leaves, and is cobwebby at base and glandular above.[5]
The inflorescence has tiny white to purple bell-shaped flowers each a few millimeters long.[5] The flowering period is May to August.[2]
References
- ↑ Flann, C (ed) 2009+ Global Compositae Checklist search for Dimeresia
- ↑ 2.0 2.1 2.2 Calflora: Dimeresia howellii
- ↑ Gray, Asa. 1886. Synoptical Flora of North America 1(2): 448–449
- ↑ Tropicos, Dimeresia − A. Gray
- ↑ 5.0 5.1 5.2 5.3 Jepson eFlora: Dimeresia howellii[yes|permanent dead link|dead link}}]
- ↑ Flora of North America, Dimeresia A. Gray
- ↑ Biota of North America Program 2013 county distribution map
External links
- Calflora Database: Dimeresia howellii (Doublet)
- USDA Plants Profile for Dimeresia howellii (doublet)
- Jepson Manual eFlora (TJM2) treatment of Dimeresia howellii[yes|permanent dead link|dead link}}]
- UC CalPhotos gallery of Dimeresia howellii (doublet)
Wikidata ☰ {{{from}}} entry
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