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 385 - 408 of 977 verified sightings
Observation date: Jun 14, 2017
Submitted by: Martin Reid
Region: Texas, Lipscomb County, United States
Verified by: stomlins701
Verified date: Jul 10, 2017
Observation date: Jul 02, 2017
Submitted by: Selwyn Quan
Region: Santa Clara County, California, United States
Verified by: Ken Davenport
Verified date: Jul 03, 2017
Observation date: Jun 27, 2017
Submitted by: ezeemonee
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Jun 28, 2017
Observation date: Jun 19, 2017
Submitted by: Breck Breckenridge
Region: Amador County, California, United States
Verified by: Ken Davenport
Verified date: Jun 23, 2017
Observation date: Jun 14, 2017
Submitted by: RichHubie
Region: Mendocino County, California, United States
Verified by: Ken Davenport
Verified date: Jun 15, 2017
Observation date: Jun 11, 2017
Submitted by: sarabseth
Region: Alameda County, California, United States
Verified by: Ken Davenport
Verified date: Jun 13, 2017
Observation date: May 28, 2017
Submitted by: MAKI
Region: Santa Barbara County, California, United States
Verified by: Ken Davenport
Verified date: Jun 10, 2017
Observation date: Jul 17, 2016
Submitted by: sloop
Region: Monterey County, California, United States
Verified by: Ken Davenport
Verified date: May 30, 2017
Observation date: Jul 17, 2016
Submitted by: sloop
Region: Monterey County, California, United States
Verified by: Ken Davenport
Verified date: May 30, 2017
Observation date: May 26, 2017
Submitted by: ezeemonee
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: May 27, 2017
Observation date: May 23, 2017
Submitted by: MAKI
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: May 27, 2017
Observation date: May 05, 2017
Submitted by: Bdog
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: May 08, 2017
Observation date: Apr 16, 2017
Submitted by: ezeemonee
Region: Riverside County, California, United States
Verified by: Ken Davenport
Verified date: Apr 19, 2017
Observation date: Apr 16, 2017
Submitted by: ezeemonee
Region: Riverside County, California, United States
Verified by: Ken Davenport
Verified date: Apr 19, 2017
Observation date: Apr 16, 2017
Submitted by: ezeemonee
Region: Riverside County, California, United States
Verified by: Ken Davenport
Verified date: Apr 19, 2017
Observation date: Mar 19, 2017
Submitted by: PONYRCR
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Mar 20, 2017
Observation date: Mar 15, 2017
Submitted by: MAKI
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Mar 17, 2017
Observation date: Mar 13, 2017
Submitted by: RichHubie
Region: Mendocino County, California, United States
Verified by: Ken Davenport
Verified date: Mar 17, 2017
Observation date: Aug 27, 2016
Submitted by: Sue Orlowski
Region: Whitman County, Washington, United States
Verified by: davidwdroppers
Verified date: Jan 26, 2017
Observation date: Jul 20, 2016
Submitted by: Sue Orlowski
Region: Lincoln County, Washington, United States
Verified by: davidwdroppers
Verified date: Jan 26, 2017
Observation date: Oct 15, 2016
Submitted by: Nancy Witthuhn
Region: Ness County, Kansas, United States
Verified by: stomlins701
Verified date: Oct 17, 2016
Observation date: Aug 30, 2016
Submitted by: RichHubie
Region: Mendocino County, California, United States
Verified by: Ken Davenport
Verified date: Sep 06, 2016
Observation date: Aug 21, 2016
Submitted by: Breck Breckenridge
Region: San Joaquin County, California, United States
Verified by: Ken Davenport
Verified date: Sep 05, 2016
Observation date: Aug 06, 2016
Submitted by: MAKI
Region: Stanislaus County, California, United States
Verified by: Ken Davenport
Verified date: Sep 04, 2016
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