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 121 - 144 of 976 verified sightings
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
Observation date: Sep 05, 2021
Submitted by: hasfitz5
Region: Napa County, California, United States
Verified by: Ken Davenport
Verified date: Feb 14, 2023
Observation date: Nov 04, 2022
Submitted by: stevecary
Region: San Luis Obispo County, California, United States
Verified by: Ken Davenport
Verified date: Feb 02, 2023
Observation date: Nov 04, 2022
Submitted by: stevecary
Region: San Luis Obispo County, California, United States
Verified by: Ken Davenport
Verified date: Jan 19, 2023
Observation date: Sep 16, 2022
Submitted by: Dobber31
Region: Tuolumne County, California, United States
Verified by: Ken Davenport
Verified date: Nov 09, 2022
Observation date: Oct 16, 2022
Submitted by: mstanek
Region: Los Angeles County, California, United States
Verified by: Ken Davenport
Verified date: Oct 19, 2022
Observation date: Jul 17, 2022
Submitted by: MAKI
Region: Santa Barbara County, California, United States
Verified by: Ken Davenport
Verified date: Oct 13, 2022
Observation date: Apr 24, 2020
Submitted by: Laurelintx
Region: Bandera County, Texas, United States
Verified by: jwileyrains
Verified date: Oct 10, 2022
Observation date: Sep 18, 2022
Submitted by: mstanek
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Sep 19, 2022
Observation date: Sep 11, 2022
Submitted by: Lisahug
Region: Nevada County, California, United States
Verified by: Ken Davenport
Verified date: Sep 13, 2022
Observation date: Aug 27, 2022
Submitted by: madamirie
Region: Santa Cruz County, California, United States
Verified by: Ken Davenport
Verified date: Aug 28, 2022
Observation date: Aug 18, 2022
Submitted by: Lisahug
Region: Shasta County, California, United States
Verified by: Ken Davenport
Verified date: Aug 18, 2022
Observation date: Aug 12, 2022
Submitted by: Luna-Linuche.76
Region: Klamath County, Oregon, United States
Verified by: Ken Davenport
Verified date: Aug 16, 2022
Observation date: Aug 14, 2022
Submitted by: Seth Mueller
Region: San Bernardino County, California, United States
Verified by: Ken Davenport
Verified date: Aug 14, 2022
Observation date: Jul 21, 2022
Submitted by: madamirie
Region: Monterey County, California, United States
Verified by: Ken Davenport
Verified date: Aug 14, 2022
Observation date: Aug 06, 2022
Submitted by: radek_smolec
Region: Santa Barbara County, California, United States
Verified by: Ken Davenport
Verified date: Aug 08, 2022
Observation date: Aug 03, 2022
Submitted by: butterflies4us
Region: San Diego County, California, United States
Verified by: Ken Davenport
Verified date: Aug 04, 2022
Observation date: Jul 23, 2022
Submitted by: dharlette
Region: Marin County, California, United States
Verified by: Ken Davenport
Verified date: Jul 28, 2022
Observation date: Jul 17, 2022
Submitted by: Varn
Region: Johnson County, Wyoming, United States
Verified by: J_Martineau
Verified date: Jul 28, 2022
Observation date: Jul 21, 2022
Submitted by: madamirie
Region: Monterey County, California, United States
Verified by: Ken Davenport
Verified date: Jul 22, 2022
Observation date: Jun 26, 2022
Submitted by: camflies
Region: Santa Barbara County, California, United States
Verified by: Ken Davenport
Verified date: Jul 06, 2022
Observation date: Aug 13, 2019
Submitted by: Paul Prappas
Region: Marin County, California, United States
Verified by: Ken Davenport
Verified date: Jul 05, 2022
Observation date: Jul 04, 2022
Submitted by: mstanek
Region: Ventura County, California, United States
Verified by: Ken Davenport
Verified date: Jul 04, 2022
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