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 289 - 312 of 976 verified sightings
Observation date: Aug 06, 2019
Submitted by: cokob
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Aug 06, 2019
Observation date: Aug 06, 2019
Submitted by: dharlette
Region: San Mateo County, California, United States
Verified by: Ken Davenport
Verified date: Aug 06, 2019
Observation date: Aug 03, 2019
Submitted by: alicecas
Region: Monterey County, California, United States
Verified by: Ken Davenport
Verified date: Aug 06, 2019
Observation date: Aug 03, 2019
Submitted by: alicecas
Region: Monterey County, California, United States
Verified by: Ken Davenport
Verified date: Aug 06, 2019
Observation date: Jul 25, 2019
Submitted by: Cactuswren1976
Region: Sandoval County, New Mexico, United States
Verified by: stevecary
Verified date: Aug 01, 2019
Observation date: Jul 09, 2019
Submitted by: Cactuswren1976
Region: Santa Fe County, New Mexico, United States
Verified by: stevecary
Verified date: Aug 01, 2019
Observation date: Jun 24, 2019
Submitted by: Cactuswren1976
Region: Santa Fe County, New Mexico, United States
Verified by: stevecary
Verified date: Jul 31, 2019
Observation date: Jul 22, 2019
Submitted by: Lisahug
Region: Sonoma County, California, United States
Verified by: Ken Davenport
Verified date: Jul 25, 2019
Observation date: Jul 20, 2019
Submitted by: Lisahug
Region: Solano County, California, United States
Verified by: Ken Davenport
Verified date: Jul 25, 2019
Observation date: Jul 20, 2019
Submitted by: MAKI
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Jul 22, 2019
Observation date: Jul 14, 2019
Submitted by: Scott Burgess
Region: Humboldt County, California, United States
Verified by: Ken Davenport
Verified date: Jul 18, 2019
Observation date: Jun 29, 2019
Submitted by: sfbaywildlife
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jul 18, 2019
Observation date: Jul 04, 2019
Submitted by: ezeemonee
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Jul 12, 2019
Observation date: Jun 28, 2019
Submitted by: ezeemonee
Region: Kern County, California, United States
Verified by: Ken Davenport
Verified date: Jul 10, 2019
Observation date: Jul 04, 2019
Submitted by: MAKI
Region: Stanislaus County, California, United States
Verified by: Ken Davenport
Verified date: Jul 10, 2019
Observation date: May 25, 2019
Submitted by: Ed Rothwell
Region: Luna County, New Mexico, United States
Verified by: stevecary
Verified date: Jun 21, 2019
Observation date: Jun 15, 2019
Submitted by: Team Kweeper
Region: Nevada County, California, United States
Verified by: Ken Davenport
Verified date: Jun 16, 2019
Observation date: Jun 13, 2019
Submitted by: cevmendo
Region: Lake County, California, United States
Verified by: Ken Davenport
Verified date: Jun 14, 2019
Observation date: May 31, 2019
Submitted by: ezeemonee
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Jun 01, 2019
Observation date: Jun 29, 2018
Submitted by: Scott Burgess
Region: Humboldt County, California, United States
Verified by: Ken Davenport
Verified date: Jun 01, 2019
Observation date: Sep 01, 2018
Submitted by: Scott Burgess
Region: Humboldt County, California, United States
Verified by: Ken Davenport
Verified date: May 29, 2019
Observation date: Jul 21, 2018
Submitted by: Scott Burgess
Region: Humboldt County, California, United States
Verified by: Ken Davenport
Verified date: May 28, 2019
Observation date: Jul 09, 2018
Submitted by: Scott Burgess
Region: Humboldt County, California, United States
Verified by: Ken Davenport
Verified date: May 28, 2019
Observation date: May 24, 2019
Submitted by: TripleJranchAG
Region: San Luis Obispo County, California, United States
Verified by: Ken Davenport
Verified date: May 24, 2019
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