Alabama Butterfly Atlas

Butterfly: Wingspan: 1 - 1½ inches (3 - 3.8 cm) UPPER SURFACE (dorsal) Seldom seen. Light gray brown. Small orange spots on hindwing edge. UNDER SURFACE (ventral) Pale brown. Band of dark brown oval spots (not dashes) outlined in white on fore and hind wings. Blue hindwing tail-spot is typically not topped with orange, although sometimes there may be some red scales. Orange marking on inner hindwing edge. One tail on each hindwing; sometimes an additional very short tail.

ID Tip: A band of white-ringed oval dark spots on closed wing surface separates this from other hairstreaks. There is no orange or very slight orange on the blue spot near the tail.

Egg: Creamy, tinged with pink later turning pale green. Flattened disc. Laid singly or in very small groups at the base of saplings near specific ant colonies. The overwintering stage.

Caterpillar: Dark brown with dark band and pale dashes; or lighter brown with more extensive pale dashes. Head shiny black. Slug shaped.

Chrysalis: Tan or chestnut speckled with dark brown.

Edwards' Hairstreaks have one brood, flying once a year in early summer.  The flight typically coincides with the blooming of Butterfly Milkweed, a favorite nectar source. They have also been observed nectaring on other milkweeds, several composites, and even Oakleaf Hydrangea.  Both sexes avidly nectar and often sit together on the same flower.  Males perch on low vegetation (or even the ground) to establish territories and to look for females; they are very noticeable when they dart out to investigate anything that flies.

Females deposit eggs in bark crevices on sapling trees. In Alabama, tree height has been documented to range from 10 feet to 12 inches, with most topping out at 2 feet or less. Placement is low on the tree trunk, sometimes at ground level. Several eggs may be placed in one spot, where they remain throughout the fall and winter. In spring, caterpillars hatch and eat young leaves.  At third instar, larvae develop a honey gland (sometimes called a Newcomer’s organ) that secretes a sugary substance extremely attractive to ants. A species of wood ant (Formica integra) discovers the caterpillars and defends them against predators to protect their food source.  The ants build a detritus structure known as a byre at the foot of the caterpillars’ host tree. During the day, caterpillars rest/hide within the byre. Under cover of darkness, they journey up the tree to eat. Ants precede them and sweep the area for predators. At dawn, the caterpillars, along with attendant ants, crawl back down the tree to the shelter. Chrysalides are formed within the byre, in ant tunnels within or under the byre, in nearby dead leaves, or are attached to the host tree's base. Since Edwards’ Hairstreak pupae also contain Hinton’s glands, ants continue to vigorously defend them. Upon emergence, adult hairstreaks crawl out of subterranean chambers if their chrysalides were formed within the ants’ tunnels.

Edwards’ Hairstreaks’ close resemblance to other hairstreaks in their genus (satyrium) and their short flight time makes them easy to overlook and misidentify. Prior to 2020, Edwards’ Hairstreaks were known from only two sites in Alabama. In late May of that year, an Edwards' was identified in a photograph from the Shoal Creek Ranger District of the Talladega National Forest. In the three weeks that followed, there were 40 records. In 2021, a photo of Clasping Milkweed taken in the Talladega Ranger District of the Talladega National Forest also contained three Edwards’ Hairstreaks, and an even larger colony was discovered. Thirty-two individuals were recorded in one day. During late spring/early summer, small hairstreaks should be carefully examined to determine their identity--particularly near Alabama's eastern border where Edwards' occur.

 

Distribution and Abundance

A dot on the county map indicates that there is at least one documented record of the species within that county. In some cases, a species may be common throughout the county, in others it may be found in only a specific habitat. The High Count information shows the highest numbers recorded for this species as well as when and where they occurred.

The sightings bar graphs depict the timing of flight(s) within each of three geographic regions. Place your cursor on a bar within the graph to see the number of individuals recorded during that period.

The abundance calendar displays the total number of individuals recorded within each week of the month. Both the graphs and the calendar are on based data collection that began in 2000.

The records analyzed here are only a beginning. As more data is collected, these maps and graphs will paint a more accurate picture of distribution and abundance in Alabama. Submit your sightings to albutterflyatlas@gmail.com.

Sightings in the following counties: Clay, Cleburne, DeKalb

  • Map Symbol for Recent Sightings Sightings in the past 5 years
  • Map Symbol for Semi-Recent Sightings Sightings in the past 5 - 10 years
  • Map Symbol for Old Sightings Sightings more than 10 years ago

High count(s):

  • 51 - Clay - 6/4/2023
  • 35 - Clay - 6/2/2022
  • 32 - Clay - 6/12/2021
County Distribution Map

View county names by moving the mouse over a county or view a map with county names

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
61 194 87 38 8

Habitat

Open thickets and scrubs, roadsides, utility easements, and trails in or near oak woodlands. Edwards' Hairstreak habitat is almost always fire maintained. The presence of Formica ants (Formica spp.) is probably a requirement.

Edwards' Hairstreak
Edwards' Hairstreak (Satyrium edwardsii)
County
© Sara Bright
Controlled-burned forest with Black Oak
Edwards' Hairstreak
Edwards' Hairstreak (Satyrium edwardsii)
County
© Sara Bright
Forest with Black Oak saplings
Edwards' Hairstreak
Edwards' Hairstreak (Satyrium edwardsii)
County
© Sara Bright
Opening with nectar sources near Black Oaks
Edwards' Hairstreak
Edwards' Hairstreak (Satyrium edwardsii)
County
© Sara Bright
Power cut with Black Oak

Host and Nectar Plants

Black Jack Oak (Quercus marilandica) and Turkey Oak (Q. laevis) are documented in North Carolina. Scrub Oak (Q. ilicifolia) and Black Oak (Q. velutina) are listed in other areas.

Formica integra ants have been identified as the attendant ant species in Alabama.

The following oak species has been documented in Alabama:

 

For more information about these plants, please visit the Alabama Plant Atlas using the links above.

Edwards' Hairstreak
Edwards' Hairstreak (Satyrium edwardsii)
County
© Sara Bright
Black Oak
Edwards' Hairstreak
Edwards' Hairstreak (Satyrium edwardsii)
County
© Sara Bright
Black Oak
Edwards' Hairstreak
Edwards' Hairstreak (Satyrium edwardsii)
County
© Sara Bright
Back Oak leaf
Edwards' Hairstreak
Edwards' Hairstreak (Satyrium edwardsii)
County
© Sara Bright
Black Oak leaf
Edwards' Hairstreak
Edwards' Hairstreak (Satyrium edwardsii)
County
© Sara Bright
Black Oak sprouts with byre
Edwards' Hairstreak
Edwards' Hairstreak (Satyrium edwardsii)
County
© Sara Bright
Black Oak leaves

Landscaping Ideas

If Edwards' Hairstreaks are in the area, they will be attracted to flowering plants like Butterfly Milkweed (Asclepias tuberosa) and Common New Jersey Tea (Ceonanthus americanus), nectar-rich plants that bloom during the butterflies' flight period.