Dimeresia

Dimeresia is a monotypic genus in the sunflower family containing the single species Dimeresia howellii, known by the common name doublet.[2][3][4]

Doublet
Dimeresia howellii
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Tribe:
Heliantheae
Genus:
Dimeresia

Species:
D. howellii
Binomial name
Dimeresia howellii
Synonyms[1]
  • Ereminula Greene
  • Ereminula howellii (A.Gray) Greene

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]

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References
  1. Flann, C (ed) 2009+ Global Compositae Checklist search for Dimeresia
  2. Calflora: Dimeresia howellii
  3. Gray, Asa. 1886. Synoptical Flora of North America 1(2): 448–449
  4. Tropicos, Dimeresia − A. Gray
  5. Jepson eFlora: Dimeresia howellii
  6. Flora of North America, Dimeresia A. Gray
  7. Biota of North America Program 2013 county distribution map
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