Dimeresia
| doublet | |
|---|---|
 | |
| Dimeresia howellii | |
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Tribe: | Heliantheae |
| Genus: | Dimeresia A.Gray |
| Species: | D. howellii |
| Binomial name | |
| Dimeresia howellii A.Gray | |
| 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
- 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
External links
- 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)
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Wikimedia Commons has media related to Dimeresia howellii. |