Dimeresia is a monotypic genus in the sunflower family containing the single species Dimeresia howellii, known by the common name doublet.[1] [2] [3]
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.[1] [4] [5] [6]
It grows in dry volcanic soils, primarily on the Modoc Plateau volcanic plain, at elevations of 1500m-2400mm (4,900feet-7,900feetm).[4]
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.[4]
The inflorescence has tiny white to purple bell-shaped flowers each a few millimeters long.[4] The flowering period is May to August.[1]
