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 145 - 168 of 976 verified sightings
Observation date: Jun 13, 2022
Submitted by: MAKI
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport
Verified date: Jun 15, 2022
Observation date: Apr 25, 2022
Submitted by: MAKI
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Jun 05, 2022
Observation date: Jun 04, 2022
Submitted by: MAKI
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Jun 04, 2022
Observation date: May 29, 2022
Submitted by: dharlette
Region: Marin County, California, United States
Verified by: Ken Davenport
Verified date: Jun 04, 2022
Observation date: Jun 02, 2022
Submitted by: Samela95437
Region: Mendocino County, California, United States
Verified by: Ken Davenport
Verified date: Jun 03, 2022
Observation date: May 23, 2022
Submitted by: Samela95437
Region: Mendocino County, California, United States
Verified by: Ken Davenport
Verified date: May 28, 2022
Observation date: May 21, 2022
Submitted by: Joshua C
Region: Bernalillo County, New Mexico, United States
Verified by: stevecary
Verified date: May 25, 2022
Observation date: May 15, 2022
Submitted by: weflybye
Region: Sherman County, Oregon, United States
Verified by: Ken Davenport
Verified date: May 16, 2022
Observation date: May 15, 2022
Submitted by: weflybye
Region: Sherman County, Oregon, United States
Verified by: Ken Davenport
Verified date: May 16, 2022
Observation date: May 12, 2022
Submitted by: Seth Mueller
Region: San Bernardino County, California, United States
Verified by: Ken Davenport
Verified date: May 15, 2022
Observation date: May 12, 2022
Submitted by: mstanek
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: May 13, 2022
Observation date: Apr 25, 2022
Submitted by: satchmo0802
Region: Pima County, Arizona, United States
Verified by: John Saba
Verified date: May 10, 2022
Observation date: May 02, 2022
Submitted by: Lyndie Mason Warner
Region: Navajo County, Arizona, United States
Verified by: Ken Davenport
Verified date: May 09, 2022
Observation date: May 01, 2022
Submitted by: weflybye
Region: Klickitat County, Washington, United States
Verified by: davidwdroppers
Verified date: May 04, 2022
Observation date: May 01, 2022
Submitted by: pumalover
Region: Fresno County, California, United States
Verified by: Ken Davenport
Verified date: May 02, 2022
Observation date: Apr 23, 2022
Submitted by: camflies
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Apr 24, 2022
Observation date: Apr 21, 2022
Submitted by: mstanek
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Apr 21, 2022
Observation date: Apr 17, 2022
Submitted by: Quintirishmccabe
Region: Glenn County, California, United States
Verified by: Ken Davenport
Verified date: Apr 20, 2022
Observation date: Apr 18, 2022
Submitted by: dlister
Region: Riverside County, California, United States
Verified by: Ken Davenport
Verified date: Apr 18, 2022
Observation date: Apr 07, 2022
Submitted by: JudyLY
Region: Doña Ana County, New Mexico, United States
Verified by: stevecary
Verified date: Apr 11, 2022
Observation date: Apr 07, 2022
Submitted by: Gordon Berman
Region: New Mexico, United States
Verified by: stevecary
Verified date: Apr 08, 2022
Observation date: Apr 06, 2022
Submitted by: Marta Reece
Region: Doña Ana County, New Mexico, United States
Verified by: stevecary
Verified date: Apr 08, 2022
Observation date: Jun 06, 2015
Submitted by: yhelfman
Region: Santa Clara County, California, United States
Verified by: Ken Davenport
Verified date: Apr 02, 2022
Observation date: May 26, 2013
Submitted by: yhelfman
Region: Santa Clara County, California, United States
Verified by: Ken Davenport
Verified date: Mar 31, 2022
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