Tetradymia nuttallii

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Tetradymia nuttallii
Tetradymia nuttallii (8615507189).jpg
Nuttall's horsebrush (Tetradymia nuttallii), Aster family (Asteraceae)
Status TNC G3.svg
Vulnerable  (NatureServe)
Scientific classification
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T. nuttallii
Binomial name
Tetradymia nuttallii

Tetradymia nuttallii is a species of flowering plant in the aster family known by the common name Nuttall's horsebrush. [1] It is native to the western United States, where it occurs in Nevada, Utah, Wyoming, and Colorado. [2]

This shrub or subshrub has a stiff, branching network of stems reaching up to 1.2 meters in maximum height. Like other Tetradymia, this species has two types of leaves. The larger, primary leaves become spines which may be over 2 centimeters in length. The inflorescence is made up of a few flower heads, each of which contains four bright yellow flowers. The fruit is well over a centimeter long, including its large pappus. [2] [3] The leaves fall off the plant during dry times. Also when it is dry the plant may not flower, or if it does, it does not produce fruits. [2]

This plant grows in habitat dominated by shadscale and black greasewood, as well as sagebrush and pinyon-juniper woodland. It grows in dry and sometimes rocky soils. [2]

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Tetradymia argyraea is a species of flowering plant in the aster family known by the common names spineless horsebrush and gray horsebrush. It is native to western North America from British Columbia to California to New Mexico, where it grows in sagebrush, woodlands, forest, scrubby open plains, and other habitat. It is a bushy shrub growing to 60 to 80 centimeters in maximum height with multibranched woody or semi-woody stems that grow from taproots. It is coated in woolly fibers with hairless strips at intervals along the branches. It has no spines. The lance-shaped leaves are no more than 4 centimeters long and woolly or silver-haired in texture. Longer-lived leaves are alternately arranged along the stem and smaller, shorter-lived leaves occur in clusters near the axils of the primary leaves. The inflorescence bears usually three to six flower heads which are each enveloped in four thick phyllaries coated in white woolly hairs. Each head contains four tubular flowers in shades of pale to bright yellow, each measuring up to 1.5 centimeters long. Flowers are produced in summer. The fruit is an achene which may be up to 1.5 centimeters long including its long pappus of bristles.

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Tetradymia glabrata is a species of flowering plant in the aster family known by the common name littleleaf horsebrush. It is native to the western United States, especially the Great Basin and Mojave Desert. Its habitat includes sagebrush, woodlands, and scrub. It is an erect, bushy shrub growing to a maximum height over one meter, its stems coated unevenly in white woolly fibers with many bare strips. The narrow, pointed leaves are usually no more than a centimeter long and most occur in clusters along the branches. The inflorescence bears up to seven flower heads which are each enveloped in four woolly phyllaries. Each head contains four yellow cream flowers each around a centimeter long. The fruit is a hairy, ribbed achene with a pappus of bristles.

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Tetradymia tetrameres is a species of flowering plant in the aster family known by the common name fourpart horsebrush and dune horsebrush. It is native to the Great Basin, where it occurs in western Nevada and just over the border in Mono County, California. It is a plant of dry scrub and sand dunes. It is a bushy, woolly shrub with many erect, spineless branches. It is the largest of the horsebrushes, growing up to two meters in height. The soft, woolly leaves are narrow and threadlike, growing up to 4 centimeters long. Shorter leaves occur in clusters around the primary leaves. The inflorescence bears 4 to 6 flower heads which are each enveloped in four or five woolly phyllaries. Each head contains up to four or five light yellow flowers each around a centimeter long. The fruit is a hairy achene which may be up to a centimeter long, including its pappus of long bristles.

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References

  1. "Tetradymia nuttallii". Natural Resources Conservation Service PLANTS Database. USDA . Retrieved 9 December 2015.
  2. 1 2 3 4 Howard, Janet L. 2002. Tetradymia nuttallii. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory.
  3. Tetradymia nuttallii. Flora of North America.