Dimeresia
| Dimeresia | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Embryophytes |
| 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 | |
| Synonyms[2][3] | |
| |
Dimeresia is a monotypic genus in the sunflower family containing the single species Dimeresia howellii, known by the common name doublet.[4][5][6]
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.[4][7][8][9]
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).[7]
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.[7]
The inflorescence has tiny white to purple bell-shaped flowers each a few millimeters long.[7] The flowering period is May to August.[4]
References
- ↑ NatureServe (1 May 2026). "Dimeresia howellii". NatureServe Explorer. Arlington, Virginia. Retrieved 3 June 2026.
- ↑ POWO (2026). "Dimeresia A.Gray". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 3 June 2026.
- ↑ POWO (2026). "Dimeresia howellii A.Gray". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 3 June 2026.
- 1 2 3 Calflora: Dimeresia howellii
- ↑ Gray, Asa. 1886. Synoptical Flora of North America 1(2): 448–449
- ↑ Tropicos, Dimeresia − A. Gray
- 1 2 3 4 Jepson eFlora: Dimeresia howellii
- ↑ Flora of North America, Dimeresia A. Gray
- ↑ Biota of North America Program 2013 county distribution map
