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]

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
  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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