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Montana Field Guide

Montana Field Guides

Monarch - Danaus plexippus


Global Rank: G4
State Rank: S4B

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General Description
[From Ferris and Brown 1981; Scott 1986; Opler and Wright 1999; Glassberg 2001; Pyle 2002] Forewing 5.2-5.8 cm. Large, forewing long and drawn-out. Uppersurface with large orange ovals in tip of forewing, males bright orange with black scent patch in middle of hindwing, females duller orange with thicker black scaling of veins and no black scent patch; black border has two rows of tiny white spots; hindwing lacks black postmedian line.

Phenology
Five or more flights, all year in California and southern Florida; several flights, March to November in New Mexico and southern Nevada; one or two flights, May to October (Scott 1986). Mainly March/April to October/November (Glassberg 2001); early June to early October in Oregon and Washongton (Pyle 2002).

Diagnostic Characteristics
Distinctive; best told by color and large size, black border with two rows of tiny white spots, hindwing lacking black postmedian line.

Species Range
Montana Range

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Range Comments
In the New World, southern Canada and entire continental US south to South America, also many oceanic islands, overwintering in coastal California and Transvolcanic Belt of Mexico; naturalized in many other regions around the globe (Opler and Wright 1999; Glassberg 2001; Pyle 2002); to at least 3505 m elevation in Colorado, but usually below 2745 m (Scott and Scott 1978). In Montana, reported statewide (Kohler 1980; Stanford and Opler 1993). Common throughout the western range, except rare to uncommon in the Pacific Northwest (Glassberg 2001).

Summary of Observations Submitted for Montana
Number of Observations: 21

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Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Migration
Migratory. Move northward over several flights, then final flight moves south to overwintering sites primarily in coastal California and central Mexico (Scott 1986; Glassberg 2001; Pyle 2002). Majority of southward-moving individuals west of the continental divide probably overwinter in coastal California, southward-moving individuals east of the divide probably overwinter in central Mexico, but still little data to support this.

Habitat
Open places, native prairie, foothills, open valley bottoms, open weedy fields, roadsides, pastures, marshes, suburban areas, rarely above treeline in alpine terrain during migration (Scott 1986; Opler and Wright 1999; Glassberg 2001; Pyle 2002). Reported in Glacier National Park, Montana in mesic montane meadows (Debinski 1993).

Food Habits
Larval food plants include Apocynum, several species of Asclepias (the primary host plant genus), Calotropis, Matelea, and Sarcostemma (Scott 1986, 1992, 2006; Guppy and Shepard 2001; Pyle 2002). Adults feed on flower nectar (including Achillea, Apocynum, Asclepias, Aster, Buddleia, Chrysothamnus, Carduus, Cirsium, Cleome, Conyza, Cosmos, Daucus, Dipsacus, Echinacea, Echinocystus, Eupatorium, Helianthus, Hesperis, Liatris, Lonicera, Machaeranthera, Medicago, Pastinaca, Phlox, Polygonum, Ratibida, Senecio, Solidago, Sonchus, Symphoricarpos, Syringa, Tagetes, Taraxacum, Trifolium, Verbena, Vernonia, Vicia, Zinnia) and mud (Scott 1986, 2014).

Reproductive Characteristics
Females lay eggs (200 or more) singly under host plant leaves, stems, and inflorescences. Eggs hatch in about 6 days (depending on temperature). Growth rapid, to L5 and pupation in 18 days after egg-hatch. Adults emerge from pupae (eclose) in about 9-10 days. Larvae build no nests; L1-L2 instars hide in terminal shoots or under leaves, L3-L5 rest openly. Hibernate (overwinter) as adults (Scott 1986, 1992, 2006; Pyle 2002; James and Nunnallee 2011). Males patrol throughout the day near host plants in search of females; mating may occur at roost sites (Scott 1975b, 1986).

References
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Citation for data on this website:
Monarch — Danaus plexippus.  Montana Field Guide.  .  Retrieved on , from