Erigeron annuus

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Erigeron annuus
Erigeron annuus flowers by the Mogami River in Yonezawa, Yamagata 最上川辺のヒメジョオン (5795366075).jpg
Flower heads

Secure (NatureServe)[1]
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Erigeron
Species:
E. annuus
Binomial name
Erigeron annuus
Subspecies[2]
  • E. annuus subsp. lilacinus Sennikov & Kurtto
Synonyms[2]

Basionym

  • Aster annuus L.
Alphabetical list
    • Aster stenactis E.H.L.Krause
    • Cineraria corymbosa Moench
    • Diplopappus annuus Bluff & Fingerh.
    • Diplopappus dubius Cass.
    • Doronicum bellidiflorum Schrank
    • Erigeron annuus f. discoideus Vict. & J.Rousseau
    • Erigeron annuus var. discoideus (Vict. & J.Rousseau) Cronquist
    • Erigeron annuus var. typicus Cronquist
    • Erigeron bellidioides Spenn.
    • Erigeron diversifolius Rich. ex Rchb.
    • Erigeron heterophyllus Muhl. ex Willd.
    • Erigeron strigosus Bigelow
    • Phalacroloma acutifolium Cass.
    • Phalacroloma annuum (L.) Dumort.
    • Pulicaria annua Gaertn.
    • Pulicaria bellidiflora Wallr.
    • Stenactis annua (L.) Cass. ex Less.
    • Stenactis annua Cass.
    • Stenactis dubia Cass.

Erigeron annuus (formerly Aster annuus), the annual fleabane, daisy fleabane,[3] or eastern daisy fleabane,[4] is a species of herbaceous, annual or biennial flowering plant in the family Asteraceae.

Description[edit]

Erigeron annuus often grows as an annual but can sometimes grow as a biennial. It is herbaceous with alternate, simple leaves, and green, sparsely hairy stems, which can grow to between 30 and 150 centimeters (about 1 to 5 feet) in height. Leaves are numerous and large relative to other species of Erigeron, with lower leaves, especially basal leaves, coarsely toothed or cleft, a characteristic readily distinguishing this species from most other Erigeron.[3][4] Upper leaves are sometimes (not always) toothed, but may have a few coarse teeth towards the outer tips.[5][6]

Close-up of Erigeron annuus

The flower heads are white with yellow centers, with rays that are white to pale lavender, borne spring through fall depending on the individual plant.[7] Ray florets number 40 to 100.[3]

Distribution and habitat[edit]

Erigeron annuus is native to North America and Central America.[2] It is widespread in most of the United States, especially in the eastern part of its range, but occurs only in scattered locations in the western and southernmost parts of its range.[8] It has been introduced to many other places,[9][10][11] including Korea,[12] Europe, India, and other areas in Asia.[2]

Erigeron annuus grows well in full through partial sun on sites with ample moisture. It is tolerant of a wide range of soil conditions, including gravel and clay. In hot, dry weather, lower leaves often yellow and wither.[5]

Ecology[edit]

Erigeron annuus is a native pioneer species that often colonizes disturbed areas such as pastures, abandoned fields, vacant lots, roadsides, railways, and waste areas. In these habitats it competes, often successfully, with introduced invasive weeds.[5]

Flowers are pollinated by a variety of bees, including little carpenter bees, cuckoo bees, halictine bees, and masked bees; as well as flies, including syrphid flies, bee flies, tachinid flies, flesh flies, anthomyiid flies, and muscid flies. Wasps, small butterflies, and other insects also visit the flowers to a lesser degree, seeking nectar, as well as a few pollen-feeding beetles.[5]

Schinia lynx (lynx flower moth) caterpillars feed on the flowers and seeds of annual fleabane and other fleabanes, and Lygus lineolaris (tarnished plant bug) sucks the plant juices. Some mammals eat the foliage, flowers and stems, including sheep, groundhogs, and rabbits.[5]

References[edit]

  1. ^ NatureServe (3 September 2021). "Erigeron annuus White-top Fleabane". NatureServe Explorer (explorer.natureserve.org). Arlington, Virginia: NatureServe. Retrieved 23 September 2021.
  2. ^ a b c d POWO (2021), "Erigeron annuus (L.) Desf", Plants of the World Online (www.plantsoftheworldonline.org), Royal Botanic Gardens, Kew, retrieved 23 September 2021
  3. ^ a b c Ann Fowler Rhoads and Timothy A. Block, Ill. Ann Anisko, Plants of Pennsylvania, 2nd ed, University of Pennsylvania Press, 2007. pp. 923.
  4. ^ a b David M. Brandenburg, Field Guide to Wildflowers of North America, National Wildlife Federation, Sterling Publishing Co., New York, 2010, pp. 150.
  5. ^ a b c d e Hilty, John (2016), "Annual Fleabane (Erigeron annuus)", Illinois Wildflowers
  6. ^ Nesom, Guy L. (2006), "Erigeron annuus", in Flora of North America Editorial Committee (ed.), Flora of North America North of Mexico (FNA), vol. 20, New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA
  7. ^ "Annual Fleabane", USGS, 3 August 2006, retrieved 29 April 2008
  8. ^ Biota of North America Program 2014 state-level distribution map
  9. ^ USDA, NRCS (n.d.), "Erigeron annuus", The PLANTS Database (plants.usda.gov), Greensboro, North Carolina: National Plant Data Team
  10. ^ Chen, Yilin; Brouillet, Luc, "Erigeron annuus", Flora of China – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA
  11. ^ Altervista Flora Italiana, Cespica annua, Erigeron annuus (L.) Desf. includes photos and European distribution map
  12. ^ "개망초". www.doopedia.co.kr (in Korean). Retrieved 2018-05-07.

External links[edit]