Home/Species/ Inch-high Fleabane

Erigeron uncialis

Blake

Inch-high Fleabane

G4Apparently Secure Found in 3 roadless areas NatureServe Explorer →

G4Apparently SecureGlobal Rank

LowThreat Impact

Identity

Unique IDELEMENT_GLOBAL.2.814803

Element CodePDASTE1080

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryVascular Plant

Endemicendemic to a single nation

KingdomPlantae

PhylumAnthophyta

ClassDicotyledoneae

OrderAsterales

FamilyAsteraceae

GenusErigeron

Concept Reference

Flora of North America Editorial Committee (FNA). 2006b. Flora of North America north of Mexico. Vol. 20. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. Oxford Univ. Press, New York. xxii + 666 pp.

Taxonomic Comments

This concept of Erigeron uncialis excludes the east-central Nevada plants recognized as Erigeron cavernensis in Flora of North America vol. 20 (2006b).

Conservation Status

Rank Method Rank calculation - Biotics v2

Review Date2025-03-24

Change Date2025-03-24

Edition Date2025-03-24

Edition AuthorsJohnson, J. (2025)

Threat ImpactLow

Range Extent20,000-200,000 square km (about 8000-80,000 square miles)

Number of Occurrences21 - 80

Rank Reasons

Erigeron uncialis is a perennial herb native to high-elevation limestone mountains in eastern California and southern and eastern Nevada. Although populations are widely scattered and relatively small, the species has few threats and a relatively stable population over time.

Range Extent Comments

Erigeron uncialis is native to high-elevation limestone mountains in eastern California and southern and eastern Nevada, western United States. Range extent was estimated using herbarium specimens, photo-based observations, and NatureServe Network occurrence data collected between 1994 and 2025 (RARECAT 2024, GBIF 2025, iNaturalist 2025, NatureServe 2025, SEINet 2025, CNDDB 2025).

Occurrences Comments

By applying a 1 km separation distance to herbarium specimens, photo-based observations, and NatureServe Network occurrence data documented between 1994 and 2025, it is estimated that there are 31 occurrences rangewide (RARECAT 2024, GBIF 2025, iNaturalist 2025, NatureServe 2025, SEINet 2025, CNDDB 2025).

Threat Impact Comments

Erigeron uncialis has few threats in its high-elevation habitat. The occurrences adjacent to the Lee Canyon Ski Area in the Spring Mountains, Nevada, could be affected by future expansion of the ski runs or changes to area management practices (NatureServe 2025). Climate change may reduce the area of suitable habitat within the species' range.

Ecology & Habitat

Habitat

Erigeron uncialis grows in crevices, cliff bases and boulders, usually in limestone, in yellow pine or limber pine forests, and pinyon-juniper woodlands (FNA 2006).

Terrestrial Habitats

Forest - ConiferWoodland - ConiferBare rock/talus/screeCliff

Other Nations (1)

United StatesN4

Province	Rank	Native
California	SNR	Yes
Nevada	S3	Yes

Threat Assessments

Threat	Scope	Severity	Timing
1 - Residential & commercial development	Small (1-10%)	Serious or 31-70% pop. decline	Moderate (short-term)
1.3 - Tourism & recreation areas	Small (1-10%)	Serious or 31-70% pop. decline	Moderate (short-term)
11 - Climate change & severe weather	Pervasive (71-100%)	Unknown	Low (long-term)
11.1 - Habitat shifting & alteration	Pervasive (71-100%)	Unknown	Low (long-term)

Plant Characteristics

DurationPERENNIAL

Economic Value (Genus)No

Roadless Areas (3)

California (1)

Area	Forest	Acres
Birch Creek	Inyo National Forest	28,816

Nevada (2)

Area	Forest	Acres
Angel Peak North	Humboldt-Toiyabe National Forest	12,577
Charleston - Carpenter	Humboldt-Toiyabe National Forest	17,828

References (9)

California Natural Diversity Database (CNDDB). 2025. RareFind Version 5.3.0. California Department of Fish and Game, Sacramento.
Flora of North America Editorial Committee (FNA). 2006b. Flora of North America north of Mexico. Vol. 20. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. Oxford Univ. Press, New York. xxii + 666 pp.
Global Biodiversity Information Facility (GBIF). 2025. Global Biodiversity Information Facility (GBIF) data portal. Online. Available: https://www.gbif.org/ (accessed 2025).
iNaturalist. 2025. Online. Available: https://www.inaturalist.org (accessed 2025).
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
NatureServe. 2025. NatureServe Network Biodiversity Location Data. NatureServe, Arlington, Virginia.
NatureServe's Rapid Analysis of Rarity and Endangerment Conservation Assessment Tool (RARECAT). 2024. Version: 1.1.1 (released Oct 01, 2024).
Nesom, G.L. 2004d. Taxonomic reevaluations in North American <i>Erigeron</i> (Asteraceae: Astereae). Sida 21(1):19-39.
Southwest Environmental Information Network (SEINet). 2025. Collections Databases. Online. Available: https://swbiodiversity.org/seinet/collections/index.php (accessed 2025).

Erigeron uncialis

Habitat

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