Dimeresia is a monotypic genus in the sunflower family containing the single species Dimeresia howellii, known by the common name doublet.[2][3][4]
| 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
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| Binomial name | |
| Dimeresia howellii | |
| Synonyms[1] | |
| |
Distribution
editThis 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
editDimeresia 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
edit- ^ Flann, C (ed) 2009+ Global Compositae Checklist search for Dimeresia
- ^ a b c Calflora: Dimeresia howellii
- ^ Gray, Asa. 1886. Synoptical Flora of North America 1(2): 448–449
- ^ Tropicos, Dimeresia − A. Gray
- ^ a b c d Jepson eFlora: Dimeresia howellii
- ^ Flora of North America, Dimeresia A. Gray
- ^ Biota of North America Program 2013 county distribution map
External links
edit- Calflora Database: Dimeresia howellii (Doublet)
- USDA Plants Profile for Dimeresia howellii (doublet)
- Jepson Manual eFlora (TJM2) treatment of Dimeresia howellii
- UC CalPhotos gallery of Dimeresia howellii (doublet)
Media related to Dimeresia at Wikimedia Commons
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