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.
Please donate!
We depend on donations to keep Butterflies and Moths of North America freely available. We want to express our gratitude to all who showed their support by making a contribution this year. You can donate to support this project at any time.
Advertise with us!
Do you have a product or service that you think would interest BAMONA users? If you would like to advertise on this website, contact us by email, or use the contact form and select the "Advertising" category.
Verified Sightings
Displaying 1 - 24 of 973 verified sightings
Observation date: Oct 01, 2025
Submitted by: rob77897@gmail.com
Region: Santa Barbara County, California, United States
Verified by: Ken Davenport
Verified date: May 13, 2026
Observation date: May 03, 2026
Submitted by: ezeemonee
Region: Kern County, California, United States
Verified by: Ken Davenport
Verified date: May 10, 2026
Observation date: Apr 19, 2026
Submitted by: ezeemonee
Region: Santa Barbara County, California, United States
Verified by: Ken Davenport
Verified date: Apr 29, 2026
Observation date: Apr 19, 2026
Submitted by: ezeemonee
Region: Santa Barbara County, California, United States
Verified by: Ken Davenport
Verified date: Apr 29, 2026
Observation date: Apr 19, 2026
Submitted by: ezeemonee
Region: Santa Barbara County, California, United States
Verified by: Ken Davenport
Verified date: Apr 29, 2026
Observation date: Apr 28, 2026
Submitted by: madamirie
Region: Monterey County, California, United States
Verified by: Ken Davenport
Verified date: Apr 29, 2026
Observation date: Apr 28, 2026
Submitted by: madamirie
Region: Monterey County, California, United States
Verified by: Ken Davenport
Verified date: Apr 29, 2026
Observation date: Apr 18, 2026
Submitted by: Flagstaff123
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Apr 19, 2026
Observation date: Apr 02, 2026
Submitted by: madamirie
Region: Santa Clara County, California, United States
Verified by: Ken Davenport
Verified date: Apr 06, 2026
Observation date: Mar 29, 2026
Submitted by: mstanek
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Mar 31, 2026
Observation date: Feb 14, 2026
Submitted by: mstanek
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Feb 18, 2026
Observation date: Feb 06, 2026
Submitted by: MAKI
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Feb 07, 2026
Observation date: Jan 30, 2026
Submitted by: ezeemonee
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Feb 02, 2026
Observation date: Jun 11, 2024
Submitted by: ncrosbyrd
Region: Greenlee County, Arizona, United States
Verified by: Ken Davenport
Verified date: Jan 18, 2026
Observation date: Nov 01, 2025
Submitted by: Ghostie6250
Region: Placer County, California, United States
Verified by: Ken Davenport
Verified date: Nov 07, 2025
Observation date: Jul 16, 2025
Submitted by: Luna-Linuche.76
Region: Clallam County, Washington, United States
Verified by: davidwdroppers
Verified date: Oct 30, 2025
Observation date: Aug 19, 2025
Submitted by: klamke
Region: Jackson County, South Dakota, United States
Verified by: J_Martineau
Verified date: Sep 29, 2025
Observation date: Sep 11, 2025
Submitted by: butterflies4us
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Sep 14, 2025
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
- 1 of 41
- next ›