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 25 - 48 of 903 verified sightings
Observation date: Jul 01, 2023
Submitted by: madamirie
Region: Monterey County, California, United States
Verified by: Ken Davenport
Verified date: Jul 03, 2023
Observation date: May 29, 2023
Submitted by: mgla
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Jun 27, 2023
Observation date: May 21, 2023
Submitted by: butterflies4us
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Jun 22, 2023
Observation date: Jun 17, 2023
Submitted by: camflies
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Jun 18, 2023
Observation date: Jun 14, 2023
Submitted by: hasfitz5
Region: Contra Costa County, California, United States
Verified by: Ken Davenport
Verified date: Jun 18, 2023
Observation date: Jun 09, 2023
Submitted by: hasfitz5
Region: Contra Costa County, California, United States
Verified by: Ken Davenport
Verified date: Jun 13, 2023
Observation date: Jun 03, 2023
Submitted by: madamirie
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport
Verified date: Jun 08, 2023
Observation date: Jun 03, 2023
Submitted by: madamirie
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport
Verified date: Jun 08, 2023
Observation date: May 31, 2023
Submitted by: Dobber31
Region: Santa Clara County, California, United States
Verified by: Ken Davenport
Verified date: Jun 01, 2023
Observation date: May 25, 2023
Submitted by: cklindsey
Region: Walla Walla County, Washington, United States
Verified by: davidwdroppers
Verified date: May 30, 2023
Observation date: May 10, 2023
Submitted by: cklindsey
Region: Franklin County, Washington, United States
Verified by: davidwdroppers
Verified date: May 28, 2023
Observation date: May 27, 2023
Submitted by: mstanek
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: May 28, 2023
Observation date: May 25, 2023
Submitted by: SuesB
Region: Sherman County, Oregon, United States
Verified by: Ken Davenport
Verified date: May 27, 2023
Observation date: Apr 09, 2023
Submitted by: hasfitz5
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: May 25, 2023
Observation date: May 20, 2023
Submitted by: madamirie
Region: Monterey County, California, United States
Verified by: Ken Davenport
Verified date: May 25, 2023
Observation date: May 20, 2023
Submitted by: madamirie
Region: Monterey County, California, United States
Verified by: Ken Davenport
Verified date: May 25, 2023
Observation date: May 20, 2023
Submitted by: madamirie
Region: Monterey County, California, United States
Verified by: Ken Davenport
Verified date: May 25, 2023
Observation date: May 20, 2023
Submitted by: guy_incognito
Region: San Bernardino County, California, United States
Verified by: Ken Davenport
Verified date: May 22, 2023
Observation date: May 17, 2023
Submitted by: Sammy Catiis
Region: Clallam County, Washington, United States
Verified by: davidwdroppers
Verified date: May 22, 2023
Observation date: May 14, 2023
Submitted by: MAKI
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: May 21, 2023
Observation date: May 13, 2023
Submitted by: mstanek
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: May 14, 2023
Observation date: Apr 25, 2023
Submitted by: gregslak
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Apr 26, 2023
Observation date: Apr 23, 2023
Submitted by: Seth Mueller
Region: San Bernardino County, California, United States
Verified by: Ken Davenport
Verified date: Apr 26, 2023
Observation date: Feb 19, 2023
Submitted by: icosahedron
Region: Sonoma County, California, United States
Verified by: Ken Davenport
Verified date: Feb 23, 2023
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