Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: Endemic to UT, although Kartesz lists it for CO.

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Colo., Utah.
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Physical Description

Morphology

Description

Subshrubs, compact, not scapose, 0.2-0.8 × 0.5-2(-3) dm, reddish- or tannish-tomentose, reddish. Stems erect to slightly spreading, often with persistent leaf bases, up to 4 height of plant; caudex stems compact; aerial flowering stems spreading to somewhat erect, slender, solid, not fistulose, 0.05-0.2 dm, tomentose. Leaves cauline, 1 per node or fasciculate; petiole 0.1-0.2 cm, tomentose to floccose; blade linear-oblanceolate to narrowly elliptic, 0.5-1.7(-2) × 0.1-0.2(-0.3) cm, densely white-tomentose abaxially, slightly less so and often reddish or tannish adaxially, margins revolute. Inflorescences umbellate to cymose, compact, rarely reduced to single involucre, 0.5-1 × 0.5-1.5 cm; branches dichotomous, tomentose; bracts 3, scalelike, linear, 0.7-1.3 mm. Peduncles erect, 0.1-0.3(-0.4) cm, tomentose to floccose. Involucres 1 per node, turbinate-campanulate, 2-4 × 1.5-3 mm, tomentose to floccose or glabrous; teeth 5, erect, 0.4-0.7 mm. Flowers 2.5-4(-4.5) mm; perianth white, glabrous; tepals connate proximal 1/ 4, dimorphic, those of outer whorl broadly obovate to nearly orbiculate, (2-)2.5-3 mm wide, those of inner whorl oblanceolate to narrowly elliptic, 1-1.5 mm wide; stamens long-exserted, 3-5 mm; filaments sparsely pilose proximally or glabrous. Achenes light brown, 3-3.5 mm, glabrous.
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Diagnostic Description

Synonym

Eriogonum microthecum Nuttall subsp. bicolor (M. E. Jones) S. Stokes
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Type Information

Isotype for Eriogonum bicolor M.E. Jones
Catalog Number: US 292929
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Verified from the card file of type specimens
Preparation: Pressed specimen
Collector(s): M. E. Jones
Year Collected: 1891
Locality: Cisoco., Grand, Utah, United States, North America
  • Isotype: Jones, M. E. 1893. Zoe. 4: 281.
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Ecology

Habitat

Comments: Salt and mixed desert shrub & pinyon-juniper communities (Welsh et al, 1987).

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Silty, sandy, or heavy clay washes, flats, and slopes, saltbush and blackbrush communities, juniper or pinyon-juniper woodlands; 1300-2000(-2300)m.
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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering Apr-Jul.
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N3 - Vulnerable

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NatureServe Conservation Status

Rounded Global Status Rank: G3 - Vulnerable

Reasons: Thirty-one occurrences are noted in the Utah flora. Range is too limited to merit G5 rank.

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Notes

Comments

Eriogonum bicolor is common from Castle Valley and the San Rafael Swells of Carbon and Emery counties, Utah, eastward to Grand Valley of Grand County, Utah, and Mesa County, Colorado. It occurs to the south in Garfield, San Juan, Sevier, and Wayne counties of Utah, especially in Canyonlands National Park and the Grand Staircase-Escalante National Monument. The species is worthy of cultivation, although being a slow-growing perennial of rather specialized soils it is a challenge. Seed germination in garden plots is reasonably successful; transplanting is difficult.
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