Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Localities documented in Tropicos sources

Erigeron acomanus Spellenb. & P.J. Knight:
Mexico (Mesoamerica)
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Physical Description

Morphology

Description

Perennials, 4.5–15 cm; taprooted, forming mats (10–70 cm diam.) connected by systems of lignescent rhizomes and caudex branches. Stems erect (grayish), sparsely strigillose (hairs whitish, stiff), eglandular. Leaves mostly basal (persistent, spreading or ascending, in rosettes at ends of caudex branches); (grayish) blades oblanceolate to narrowly obovate or spatulate, 8–23 × 2–7 mm, much reduced distally, margins entire (apices rounded to obtuse), faces moderately strigillose, eglandular. Heads 1. Involucres ca. 5 × 7–10 mm. Phyllaries in 3–4 series, lightly to moderately white-strigose, minutely glandular. Ray florets 16–30; corollas white, 4.5–9 mm, laminae not coiling or reflexing, spreading. Disc corollas 2.5–3 mm. Cypselae 1.8–2 mm, 2-nerved, faces sparsely strigoso-hirsute; pappi: outer of setae, inner of 20–25 bristles. 2n = 18.
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Type Information

Isotype for Erigeron acomanus Spellenb. & P.J. Knight
Catalog Number: US 3208018
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): P. Knight
Year Collected: 1983
Locality: Ca. 3.2 km N of Prewitt in canyons of Entrada Sandstone, beneath cliffs., Mckinley, New Mexico, United States, North America
Elevation (m): 2118 to 2118
  • Isotype: Spellenberg, R. W. & Knight, P. J. 1989. Madrono. 36: 115.
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Ecology

Habitat

Comments: Shaded, sandy slopes that form at the bases of eroding sandstone cliffs.
Pinyon-juniper woodland; sandstone or dolomite (Sivinski and Lightfoot 1994)

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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: Known from 2 small localities in central New Mexico. The 2 populations may be distinct at the varietal level.

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Threats

Comments: Current land uses do not significantly threaten its habitats (Roth 1999). Erigeron acomanus may occasionally be impacted by mining operations (Roth 1999).

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