Hesperolinon breweri

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Hesperolinon breweri
Hesperolinon breweri (Brewer's dwarf-flax) (14279791490).jpg
Status TNC G2.svg
Imperiled  (NatureServe) [1]
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malpighiales
Family: Linaceae
Genus: Hesperolinon
Species:
H. breweri
Binomial name
Hesperolinon breweri

Hesperolinon breweri is a rare species of flowering plant in the flax family known by the common names Brewer's dwarf flax and Brewer's western flax. It is endemic to California, where it is known from three counties in the San Francisco Bay Area. It is found in chaparral ecosystems, often on serpentine soils. This is an annual herb growing erect to a maximum height near centimeters. Its narrow, linear leaves are greenish to purplish in color. It produces dense inflorescences of flowers with glandular sepals and five bright yellow petals. The protruding stamens hold large orange-yellow anthers. This uncommon California endemic is threatened by development of its habitat but its current status is not known.

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Hesperolinon is a genus in the family Linaceae, whose common genus names are dwarf-flax or western flax, in reference to their distribution along the west coast of North America. There are 13 known species within this genus of wildflowers, most of which are limited to serpentine soil habitats within California, United States. These annual plants are thought to be mostly self-pollinating.

Hesperolinon adenophyllum is a rare species of flowering plant in the flax family known by the common names glandular dwarf flax and glandular western flax. It is endemic to California, where most known occurrences have been recorded in Lake and Mendocino Counties. It is generally found in chaparral ecosystems on serpentine soils. This is an annual herb growing erect to heights between 10 and 50 centimeters. Its narrow, lance-shaped leaves are lined with rows of teeth with large knobby glandular points. The flower has small sepals speckled with glandular hairs and five thin yellow petals. The stamens protrude from the face of the flower and hold large yellow anthers.

Hesperolinon drymarioides is a rare species of flowering plant in the flax family known by the common names drymary dwarf flax and drymaria-like western flax; it is named for its resemblance to genus Drymaria. It is endemic to California, where it grows in the central inland North Coast Range. Most of the few known occurrences have been noted in Lake County. It is a plant of serpentine soils in chaparral and woodland ecosystems. This is a small annual herb growing a thin branching brown stem low to the ground or erect to about 20 centimeters in height. Leaves appear in whorls of four on the lower part of the stem and are dark reddish green with plentiful glandular hairs. Its flowers have light pink-veined white petals in a corolla about a centimeter across. Protruding stamens hold large yellow or purplish-white anthers.

Hesperolinon serpentinum is a rare species of flowering plant in the flax family known by the common name Napa dwarf flax, or Napa western flax. Hesperolinon serpentinum was not validly published by McCarten although it appears in the Jepson Manual. The species was validly published as Hesperolinon sharsmithae in 2006 by O'Donnell. The species is endemic to northern California, where it is known from fewer than twenty occurrences in four counties surrounding the San Francisco Bay Area. It is a member of chaparral plant communities, generally on serpentine soils. It produces a thin, erect stem up to 30 centimeters tall, with sparse flat, narrow leaves. The inflorescence holds several light yellow flowers with petals only 2 or 3 millimeters long. The plant is threatened mainly by development of its habitat.

Hesperolinon tehamense is a rare species of flowering plant in the flax family known by the common names Tehama County western flax and Paskenta Grade dwarf flax. It is endemic to northern California, where it is known from only about ten occurrences, mostly within Tehama and Glenn Counties. Most of its habitat is on Bureau of Land Management lands and within the Mendocino National Forest, in chaparral ecosystems with serpentine soils. The plant produces thin, hairy stems up to 50 centimeters in maximum height with small, sparse linear leaves. The inflorescence bears several small flowers with pale to bright yellow notched petals just a few millimeters long.

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