Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: Endemic to Millard County, Utah.

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Utah.
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Physical Description

Morphology

Description

Subshrubs, spreading to some-what sprawling, not scapose, (1.5-)2-4 × 2-5 dm, glabrous, grayish. Stems decumbent to spreading, without persistent leaf bases, up to 1/4 height of plant; caudex stems absent or slightly spreading in moving sand; aerial flowering stems spreading, slender, solid, not fistulose, 0.5-1.5 dm, glabrous. Leaves basal or sheathing up proximal 1/ 4 of flowering stems, 1 per node; petiole 0.1-0.5(-1) cm, tomentose to floccose; blade broadly elliptic, 1-2(-2.5) × 0.8-1.7 cm, densely white-tomentose abaxially, less so to subglabrous and green adaxially, margins plane. Inflorescences cymose, open, 5-20 × 5-20 cm; branches dichotomous, glabrous; bracts 3, scalelike, triangular, 1-2.5 mm. Peduncles absent or erect, restricted to proximal nodes, (0.2-)0.5-1(-1.5) cm, glabrous. Involucres 1 per node, turbinate, (2.5-)3-3.5 × 2-2.5 mm, glabrous; teeth 5, erect, 0.4-0.8 mm. Flowers 2-3 mm; perianth white, glabrous; tepals connate proximal 1/ 4, essentially monomorphic, narrowly obovate; stamens slightly exserted, 2.5-3.5 mm; filaments puberulent proximally. Achenes light brown, 3-3.5 mm, glabrous except for distinctly papillate beak.
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Diagnostic Description

Synonym

Eriogonum nummulare M. E. Jones var. ammophilum (Reveal) S. L. Welsh
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Type Information

Isotype for Eriogonum ammophilum Reveal
Catalog Number: US 2902386
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): N. H. Holmgren & P. K. Holmgren
Year Collected: 1970
Locality: Confusion Range, Blind valley, 41 air mi. NW of Milford;, Millard, Utah, United States, North America
Microhabitat: Sandy soil.
Elevation (m): 1676
  • Isotype: Reveal, J. L. 1972. Phytologia. 23: 163.
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Holotype for Eriogonum ammophilum Reveal
Catalog Number: US 2591679A
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): N. H. Holmgren & P. K. Holmgren
Year Collected: 1970
Locality: Confusion Range, Bland valley, 41 air mi. NW of Milford; alt. 5500 ft., Millard, Utah, United States, North America
Elevation (m): 1676 to 1676
  • Holotype: Reveal, J. L. 1972. Phytologia. 23: 163.
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Ecology

Habitat

Comments: Dunes and stabilized sand in shadscale, horsebrush, winterfat, rabbitbrush, ephedra, and pinyon-juniper communities at 1460 to 1890 m elevation.

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Sandy flats and washes, mixed grassland and sagebrush communities, pinyon-juniper woodlands; of conservation concern; 1600-1900m.
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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering Jun-Sep.
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N1 - Critically Imperiled

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NatureServe Conservation Status

Rounded Global Status Rank: G1 - Critically Imperiled

Reasons: Narrowly endemic to Millard County, Utah. There are approximately 15 occurrences, each with only a small number of plants. Treated taxonomically as either a species (Eriogonum ammophilum, e.g. by Kartesz, 1999) or as a variety of Eriogonum mummulare (e.g., by Welsh et al., 1993).

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Threats

Comments: At least one area had been subject to heavy grazing as it was an experimental grazing area.

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Notes

Comments

Eriogonum ammophilum is known only from a few, scattered locations in Millard County. It is considered to be a “sensitive” species by the Bureau of Land Management.
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Names and Taxonomy

Taxonomy

Comments: Kartesz (1999 Floristic Synthesis) recognizes Eriogonum ammophilum as a full species endemic to Utah. Welsh (Flora of Utah, 1993) treats as E. nummulare var. ammophilum (Reveal) Welsh; the Utah Heritage follows Welsh.

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