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Image of Churchill Narrows buckwheat
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Churchill Narrows Buckwheat

Eriogonum diatomaceum Reveal, J. Reynolds & Picciani

Comments

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Eriogonum diatomaceum is known only from a few scattered populations in the Churchill Narrows area south of Fort Churchill State Park in Lyon County, occurring on silty diatomaceous deposits of the Coal Valley Formation. It is considered a “sensitive” species in Nevada, and is also a candidate for federal endangered listing, U.S. Fish and Wildlife Service.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 5 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Flora of North America @ eFloras.org
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Flora of North America Editorial Committee
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Description

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Herbs, matted or slightly spreading, scapose, 0.5-2 × 0.5-2.5 dm, tomentose, grayish. Stems spreading, with persistent leaf bases, up to 1/ 4 height of plant; caudex stems matted or slightly spreading; aerial flowering stems scapelike, erect, slender, solid, not fistulose, (0.4-)0.5-1.5(-2) dm, tomentose.  Leaves sheathing up flowering stem (1.5-)2-4 cm, 1 per node, fasciculate in terminal tufts on stemless caudex branches; petiole (0.3-)0.5-1.5(-1.8) cm, tomentose; blade elliptic, (0.5-)0.8-2(-2.3) × (0.3-)0.5-1.2(-1.8) cm, densely grayish-tomentose on both surfaces, margins plane. Inflorescences capitate, 1-1.5 cm wide; branches absent; bracts 3-8, elongate-triangular to triangular, scalelike, 1-3 mm, tomentose. Peduncles absent. Involucres 5-10 per cluster, turbinate, (2.5-)3-4.5 × 2-3 mm, rigid, tomentose; teeth 5-7, erect, 0.6-1 mm. Flowers (1.5-)2.5-3 mm; perianth creamy white, glabrous; tepals connate proximal 1/ 1/ 2, monomorphic, oblong-ovate; stamens exserted, 3-3.5 mm; filaments sparsely pilose proximally. Achenes light brown, 2-2.5 mm, glabrous.
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 5 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
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eFloras

Distribution

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Nev.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 5 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
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eFloras

Flowering/Fruiting

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Flowering Jun-Sep.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 5 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
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visit source
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eFloras

Habitat

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White, chalky slopes, saltbush communities; of conservation concern; 1300-1400m.
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 5 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
partner site
eFloras

Eriogonum diatomaceum

provided by wikipedia EN

Eriogonum diatomaceum is a species of wild buckwheat known by the common name Churchill Narrows buckwheat. It is endemic to Nevada in the United States, where it is known only from the Pine Nut Mountains in Lyon County. It is limited to the Churchill Narrows near Fort Churchill State Historic Park.[2] This plant was discovered in 1997 and described to science in 2002.[3]

This perennial herb has spreading stems, sometimes forming a mat up to 25 centimeters wide. It grows from a woody taproot. The leaf blades are oval in shape and coated in grayish woolly fibers. The inflorescence is a headlike cluster of flowers atop a white-woolly flowering stem up to 20 centimeters tall, but usually shorter. The flowers are cream-colored.[4] This plant looks similar to Eriogonum pauciflorum, but it is more closely related to Eriogonum ochrocephalum.[5]

This plant grows on diatomaceous clays.[6] The soil originates in the Coal Valley Formation.[3] Other species in the area include shadscale (Atriplex confertifolia), prince's plume (Stanleya pinnata var. pinnata), Bailey's greasewood (Sarcobates baileyi), budsage (Picrothamnus desertorum), green molly (Kochia americana), horsebrush (Tetradymia glabrata), annual psathyrotes (Psathyrotes annua), flat-top buckwheat (Eriogonum deflexum var. nevadense), and Lemmon's buckwheat (E. lemmonii).[5]

There is only a single population of the plant, split into about 15 occurrences and containing a total of less than 50,000 individuals. All the plants are within about three square miles of Bureau of Land Management lands.[5]

This plant is a candidate for federal protection. The substrate on which the plant grows is targeted for mining of cat litter and other products.[6] Off-road vehicle use in the area is a threat,[5] with two thirds of occurrences growing near access roads.[6] Livestock grazing is also a threat, as the animals degrade the soil.[6]

References

  1. ^ "NatureServe Explorer". NatureServe Explorer Eriogonum diatomaceum. NatureServe. 2022. Retrieved 22 May 2022.
  2. ^ Eriogonum diatomaceum. Center for Plant Conservation.
  3. ^ a b Reveal, J. L., et al. (2002). Eriogonum diatomaceum (Polygonaceae: Eriogonoideae), a new species from western Nevada, U.S.A. Novon 12(1) 87-89.
  4. ^ Eriogonum diatomaceum. Flora of North America.
  5. ^ a b c d Eriogonum diatomaceum. An Array of Botanical Images by James L. Reveal.
  6. ^ a b c d Eriogonum diatomaceum. The Nature Conservancy.

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Eriogonum diatomaceum: Brief Summary

provided by wikipedia EN

Eriogonum diatomaceum is a species of wild buckwheat known by the common name Churchill Narrows buckwheat. It is endemic to Nevada in the United States, where it is known only from the Pine Nut Mountains in Lyon County. It is limited to the Churchill Narrows near Fort Churchill State Historic Park. This plant was discovered in 1997 and described to science in 2002.

This perennial herb has spreading stems, sometimes forming a mat up to 25 centimeters wide. It grows from a woody taproot. The leaf blades are oval in shape and coated in grayish woolly fibers. The inflorescence is a headlike cluster of flowers atop a white-woolly flowering stem up to 20 centimeters tall, but usually shorter. The flowers are cream-colored. This plant looks similar to Eriogonum pauciflorum, but it is more closely related to Eriogonum ochrocephalum.

This plant grows on diatomaceous clays. The soil originates in the Coal Valley Formation. Other species in the area include shadscale (Atriplex confertifolia), prince's plume (Stanleya pinnata var. pinnata), Bailey's greasewood (Sarcobates baileyi), budsage (Picrothamnus desertorum), green molly (Kochia americana), horsebrush (Tetradymia glabrata), annual psathyrotes (Psathyrotes annua), flat-top buckwheat (Eriogonum deflexum var. nevadense), and Lemmon's buckwheat (E. lemmonii).

There is only a single population of the plant, split into about 15 occurrences and containing a total of less than 50,000 individuals. All the plants are within about three square miles of Bureau of Land Management lands.

This plant is a candidate for federal protection. The substrate on which the plant grows is targeted for mining of cat litter and other products. Off-road vehicle use in the area is a threat, with two thirds of occurrences growing near access roads. Livestock grazing is also a threat, as the animals degrade the soil.

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