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 193 - 216 of 976 verified sightings
Observation date: Jul 11, 2021
Submitted by: cklindsey
Region: San Bernardino County, California, United States
Verified by: Ken Davenport
Verified date: Jul 27, 2021
Observation date: Jul 11, 2021
Submitted by: cklindsey
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Jul 27, 2021
Observation date: Jun 26, 2021
Submitted by: cklindsey
Region: San Bernardino County, California, United States
Verified by: Ken Davenport
Verified date: Jun 28, 2021
Observation date: Jun 23, 2021
Submitted by: glennfine
Region: Mariposa County, California, United States
Verified by: Ken Davenport
Verified date: Jun 26, 2021
Observation date: Jun 16, 2021
Submitted by: Luna-Linuche.76
Region: Klamath County, Oregon, United States
Verified by: Ken Davenport
Verified date: Jun 20, 2021
Observation date: Jun 19, 2021
Submitted by: cklindsey
Region: San Bernardino County, California, United States
Verified by: Ken Davenport
Verified date: Jun 20, 2021
Observation date: Jun 29, 2014
Submitted by: chherrmann
Region: Clark County, Nevada, United States
Verified by: Ken Davenport
Verified date: Jun 14, 2021
Observation date: Jun 12, 2021
Submitted by: guy_incognito
Region: San Bernardino County, California, United States
Verified by: Ken Davenport
Verified date: Jun 13, 2021
Observation date: May 30, 2021
Submitted by: MAKI
Region: Santa Barbara County, California, United States
Verified by: Ken Davenport
Verified date: Jun 05, 2021
Observation date: May 02, 2021
Submitted by: glennfine
Region: Siskiyou County, California, United States
Verified by: Ken Davenport
Verified date: May 21, 2021
Observation date: May 18, 2021
Submitted by: guy_incognito
Region: San Bernardino County, California, United States
Verified by: Ken Davenport
Verified date: May 19, 2021
Observation date: May 18, 2021
Submitted by: guy_incognito
Region: San Bernardino County, California, United States
Verified by: Ken Davenport
Verified date: May 19, 2021
Observation date: May 18, 2021
Submitted by: guy_incognito
Region: San Bernardino County, California, United States
Verified by: Ken Davenport
Verified date: May 19, 2021
Observation date: May 15, 2021
Submitted by: jhintermeister
Region: Santa Clara County, California, United States
Verified by: Ken Davenport
Verified date: May 17, 2021
Observation date: May 09, 2021
Submitted by: Phil Warren
Region: Sonoma County, California, United States
Verified by: Ken Davenport
Verified date: May 09, 2021
Observation date: Aug 24, 2016
Submitted by: RexMundi
Region: Marion County, Oregon, United States
Verified by: davidwdroppers
Verified date: May 09, 2021
Observation date: Apr 23, 2021
Submitted by: butterflies4us
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Apr 25, 2021
Observation date: Aug 29, 2020
Submitted by: Ben Meredyk
Region: Whitman County, Washington, United States
Verified by: davidwdroppers
Verified date: Apr 20, 2021
Observation date: Mar 30, 2021
Submitted by: mstanek
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Mar 31, 2021
Observation date: Jun 21, 2020
Submitted by: WYbutterflyer1
Region: Albany County, Wyoming, United States
Verified by: J_Martineau
Verified date: Feb 08, 2021
Observation date: Jun 05, 2020
Submitted by: Nancy Witthuhn
Region: Ness County, Kansas, United States
Verified by: azukoff
Verified date: Nov 23, 2020
Observation date: Oct 19, 2020
Submitted by: JulieLuetzelschwab
Region: Rio Arriba County, New Mexico, United States
Verified by: stevecary
Verified date: Oct 27, 2020
Observation date: Oct 15, 2020
Submitted by: mstanek
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Oct 17, 2020
Observation date: Oct 14, 2020
Submitted by: mstanek
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Oct 15, 2020
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