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 930 verified sightings
Observation date: Oct 21, 2024
Submitted by: jrmbutterfly
Region: Santa Cruz County, Arizona, United States
Verified by: jwileyrains
Verified date: Dec 01, 2024
Observation date: Mar 25, 2024
Submitted by: J_Martineau
Region: Los Angeles County, California, United States
Verified by: J_Martineau
Verified date: Nov 13, 2024
Observation date: Oct 03, 2024
Submitted by: Flagstaff123
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Oct 09, 2024
Observation date: Jul 31, 2024
Submitted by: ncrosbyrd
Region: Carbon County, Montana, United States
Verified by: J_Martineau
Verified date: Sep 04, 2024
Observation date: Jul 31, 2024
Submitted by: ncrosbyrd
Region: Carbon County, Montana, United States
Verified by: J_Martineau
Verified date: Sep 04, 2024
Observation date: Jul 31, 2024
Submitted by: ncrosbyrd
Region: Carbon County, Montana, United States
Verified by: J_Martineau
Verified date: Sep 04, 2024
Observation date: Aug 14, 2024
Submitted by: Lisahug
Region: Fresno County, California, United States
Verified by: Ken Davenport
Verified date: Aug 25, 2024
Observation date: Jun 02, 2020
Submitted by: Alison Davies
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Aug 01, 2024
Observation date: Jun 02, 2020
Submitted by: Alison Davies
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Aug 01, 2024
Observation date: Jul 26, 2024
Submitted by: Zencoyote
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 31, 2024
Observation date: Jul 24, 2024
Submitted by: Zencoyote
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 31, 2024
Observation date: Jul 27, 2024
Submitted by: Nancy Hamlett
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Jul 31, 2024
Observation date: Jul 28, 2024
Submitted by: butterflies4us
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 31, 2024
Observation date: Jul 18, 2024
Submitted by: Zencoyote
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 21, 2024
Observation date: Jul 19, 2024
Submitted by: ezeemonee
Region: Kern County, California, United States
Verified by: Ken Davenport
Verified date: Jul 20, 2024
Observation date: Jul 04, 2024
Submitted by: merops
Region: Park County, Wyoming, United States
Verified by: J_Martineau
Verified date: Jul 16, 2024
Observation date: Jun 28, 2024
Submitted by: k.d.stutzman
Region: Teton County, Wyoming, United States
Verified by: J_Martineau
Verified date: Jul 16, 2024
Observation date: Jun 27, 2024
Submitted by: k.d.stutzman
Region: Teton County, Wyoming, United States
Verified by: J_Martineau
Verified date: Jul 11, 2024
Observation date: Jun 28, 2024
Submitted by: k.d.stutzman
Region: Teton County, Wyoming, United States
Verified by: J_Martineau
Verified date: Jul 11, 2024
Observation date: Jul 01, 2024
Submitted by: hasfitz5
Region: Washoe County, Nevada, United States
Verified by: Ken Davenport
Verified date: Jul 10, 2024
Observation date: Jun 18, 2024
Submitted by: ncrosbyrd
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 04, 2024
Observation date: Jun 18, 2024
Submitted by: ncrosbyrd
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 04, 2024
Observation date: Jun 28, 2024
Submitted by: Luna-Linuche.76
Region: Klamath County, Oregon, United States
Verified by: Ken Davenport
Verified date: Jul 03, 2024
Observation date: Jun 26, 2024
Submitted by: ezeemonee
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 03, 2024
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