Acmon Blue
Plebejus acmon (Westwood, [1851])
Family: Lycaenidae
Subfamily: Polyommatinae
Identification: Upperside of males blue with dark narrow border; female brown. Underside white with black spot pattern. Hindwing above and below with red-orange submarginal band.
Wing Span: 3/4 - 1 1/8 inches (2 - 2.9 cm).
Life History: Males patrol near hosts for females. Eggs are laid singly on leaves or flowers of host plants. Caterpillars feed on leaves, flowers, and developing seeds, and are tended by ants. Second-stage caterpillars hibernate.
Flight: Many flights from March-October.
Caterpillar Hosts: Various species of buckwheats (Eriogonum nudum), lupines (Lupinus), trefoils (lotus), and milkvetches (Astragalus).
Adult Food: Flower nectar.
Habitat: Desert, fields, prairie hills, weedy areas, road edges.
Range: Primarily California west of Sierra Nevada-Cascade Divide south to northern Baja California. Precise limits in neighboring Oregon and Nevada not ascertained.
Conservation: Not usually of conservation concern.
NCGR: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
Management Needs: None reported.
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Verified Sightings
Displaying 1 - 24 of 955 verified sightings
Observation date: Aug 05, 2025
Submitted by: Starlight
Region: Riverside County, California, United States
Verified by: Ken Davenport
Verified date: Aug 09, 2025
Observation date: Jul 28, 2025
Submitted by: Zencoyote
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 29, 2025
Observation date: Jul 12, 2025
Submitted by: mstanek
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Jul 25, 2025
Observation date: Jul 25, 2025
Submitted by: Zencoyote
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 25, 2025
Observation date: Jul 24, 2025
Submitted by: Sophia Reyes
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport
Verified date: Jul 25, 2025
Observation date: Jul 24, 2025
Submitted by: Sophia Reyes
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport
Verified date: Jul 25, 2025
Observation date: Jul 20, 2025
Submitted by: Sophia Reyes
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport
Verified date: Jul 24, 2025
Observation date: Jul 22, 2025
Submitted by: Sophia Reyes
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport
Verified date: Jul 24, 2025
Observation date: Jul 22, 2025
Submitted by: Zencoyote
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 23, 2025
Observation date: Jul 12, 2025
Submitted by: Sophia Reyes
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport
Verified date: Jul 13, 2025
Observation date: May 26, 1988
Submitted by: papilio1
Region: Douglas County, Nevada, United States
Verified by: Ken Davenport
Verified date: Jun 23, 2025
Observation date: Aug 28, 1984
Submitted by: papilio1
Region: Tehama County, California, United States
Verified by: Ken Davenport
Verified date: Jun 23, 2025
Observation date: Jun 14, 2025
Submitted by: Martin Neil UK
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jun 16, 2025
Observation date: Jun 10, 2025
Submitted by: Macromermaid
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Jun 14, 2025
Observation date: Jun 07, 2025
Submitted by: Zencoyote
Region: Contra Costa County, California, United States
Verified by: Ken Davenport
Verified date: Jun 08, 2025
Observation date: May 29, 2025
Submitted by: Zencoyote
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jun 02, 2025
Observation date: May 25, 2025
Submitted by: Sophia Reyes
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport
Verified date: May 31, 2025
Observation date: May 26, 2025
Submitted by: Sophia Reyes
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport
Verified date: May 31, 2025
Observation date: Jan 11, 2025
Submitted by: Lisa Nagle
Region: Pima County, Arizona, United States
Verified by: Ken Davenport
Verified date: May 27, 2025
Observation date: May 23, 2025
Submitted by: ezeemonee
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: May 24, 2025
Observation date: May 22, 2025
Submitted by: Zencoyote
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: May 24, 2025
Observation date: May 13, 2025
Submitted by: thebirdingviking
Region: Santa Clara County, California, United States
Verified by: Ken Davenport
Verified date: May 24, 2025
Observation date: Sep 06, 2023
Submitted by: hasfitz5
Region: Contra Costa County, California, United States
Verified by: Ken Davenport
Verified date: May 18, 2025
Observation date: Apr 05, 2025
Submitted by: thebirdingviking
Region: Alameda County, California, United States
Verified by: Ken Davenport
Verified date: Apr 09, 2025
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