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 241 - 264 of 976 verified sightings
Observation date: Jun 07, 2020
Submitted by: ezeemonee
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Jun 08, 2020
Observation date: May 27, 2020
Submitted by: PONYRCR
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Jun 06, 2020
Observation date: May 21, 2020
Submitted by: ezeemonee
Region: Contra Costa County, California, United States
Verified by: Ken Davenport
Verified date: Jun 04, 2020
Observation date: May 26, 2020
Submitted by: jerelreeves
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: May 28, 2020
Observation date: May 20, 2020
Submitted by: jft48
Region: Bernalillo County, New Mexico, United States
Verified by: stevecary
Verified date: May 24, 2020
Observation date: May 22, 2020
Submitted by: camflies
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: May 22, 2020
Observation date: May 17, 2020
Submitted by: mstanek
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: May 18, 2020
Observation date: May 17, 2020
Submitted by: MAKI
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: May 17, 2020
Observation date: May 11, 2020
Submitted by: Axarus
Region: Mariposa County, California, United States
Verified by: Ken Davenport
Verified date: May 12, 2020
Observation date: May 09, 2020
Submitted by: sandyleapt
Region: Multnomah County, Oregon, United States
Verified by: Ken Davenport
Verified date: May 12, 2020
Observation date: May 10, 2020
Submitted by: mstanek
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: May 12, 2020
Observation date: May 09, 2020
Submitted by: ezeemonee
Region: Kern County, California, United States
Verified by: Ken Davenport
Verified date: May 10, 2020
Observation date: May 08, 2020
Submitted by: MAKI
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: May 08, 2020
Observation date: Apr 29, 2020
Submitted by: Cactuswren1976
Region: Chaves County, New Mexico, United States
Verified by: stevecary
Verified date: May 07, 2020
Observation date: Apr 30, 2020
Submitted by: MAKI
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: May 04, 2020
Observation date: Apr 28, 2020
Submitted by: MAKI
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Apr 30, 2020
Observation date: Apr 28, 2020
Submitted by: mstanek
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Apr 29, 2020
Observation date: Aug 07, 2015
Submitted by: I Spy Butterflies
Region: Mendocino County, California, United States
Verified by: Ken Davenport
Verified date: Apr 26, 2020
Observation date: Apr 22, 2020
Submitted by: Axarus
Region: Merced County, California, United States
Verified by: Ken Davenport
Verified date: Apr 24, 2020
Observation date: Apr 11, 2020
Submitted by: mstanek
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Apr 12, 2020
Observation date: Mar 11, 2020
Submitted by: Samela95437
Region: Mendocino County, California, United States
Verified by: Ken Davenport
Verified date: Mar 17, 2020
Observation date: Mar 02, 2020
Submitted by: Cactuswren1976
Region: Santa Fe County, New Mexico, United States
Verified by: stevecary
Verified date: Mar 16, 2020
Observation date: Mar 11, 2020
Submitted by: alicecas
Region: Contra Costa County, California, United States
Verified by: Ken Davenport
Verified date: Mar 12, 2020
Observation date: Feb 21, 2020
Submitted by: J_Gonzales
Region: Monterey County, California, United States
Verified by: Ken Davenport
Verified date: Feb 28, 2020
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