Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: UT: Kane county. NM, TX, MEX.

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Ariz., Calif., N.Mex., Tex., Utah; Mexico (Chihuahua, Durango, Sonora).
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Physical Description

Morphology

Description

Herbs, narrowly erect, (0.5-)1-6 dm, tomentose, whitish to grayish. Stems: aerial flowering stems erect, (0.3-)1-3 dm, tomentose. Leaves cauline; petiole 0.3-1.5 cm; blade narrowly oblanceolate to broadly elliptic, (0.7-)1-3 × 0.5-1.5 cm, densely white-tomentose and whitish to grayish on both surfaces. Inflorescences narrowly cymose, distally uniparous due to suppression of secondary branches, open, (5-)10-50 × 10-25 cm; branches tomentose; bracts 1.5-3 × 1-2.5 mm. Peduncles absent. Involucres appressed to branches, turbinate, 1.5-2.5 × 1-2 mm, tomentose, rarely glabrous; teeth 5, erect, 0.4-1 mm. Flowers (1-)1.5-2 mm; perianth white, becoming pink or red, glabrous; tepals dimorphic, those of outer whorl broadly fan-shaped, those of inner whorl oblanceolate; stamens included, 1-1.5 mm; filaments pilose proximally. Achenes dark brown, 3-gonous, 1-1.3 mm. 2n = 26.
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Diagnostic Description

Synonym

Eriogonum densum Greene; E. vimineum var. densum (Greene) S. Stokes; E. vimineum Douglas ex Bentham subsp. polycladon (Bentham) S. Stokes
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Ecology

Habitat

Comments: Sagebrush and pinyon-juniper communities at 1050-2745 m.

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Sandy to gravelly washes, flats, and slopes, saltbush, creosote bush, greasewood, blackbrush, and sagebrush communities, oak, pinyon and/or juniper, and montane conifer woodlands; (200-)500-2200(-2500)m.
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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering year-round.
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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: G4 - Apparently Secure

Reasons: Rank of G4 from Texas Heritage Program (7/94).

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Notes

Comments

Eriogonum polycladon is widely distributed from near Needles, San Bernardino County, California (where not found since the 1930s), eastward to western Texas, and from southern Utah throughout much of central and southern Arizona into western and southern New Mexico. It is found also in the Mexican states of Chihuahua, Durango, and Sonora. It can be locally common and occasionally weedy, especially in southeastern Arizona and southwestern New Mexico.
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