Erigeron bonariensis

Erigeron bonariensis is a species of Erigeron, found throughout the tropics and subtropics as a pioneer plant; its precise origin is unknown, but most likely it stems from Central America or South America. It has become naturalized in many other regions, including North America, Europe and Australia.[2][3][4][5]

Erigeron bonariensis
Growing in the Northern Territories, Australia
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Tribe:
Astereae
Genus:
Erigeron
Species:
E. bonariensis
Binomial name
Erigeron bonariensis
Occurrence data from GBIF
Synonyms[1]

Names
Stiff hairs cover the plant.
Basal rosette leaves, before plant matures and flowers, Maui, Hawaii
Foliage becomes grey-green in dry-summer regions, such as Israel
White ray flowers and yellow disc flowers in fully "open" flower heads, Maui, Hawaii
Flower heads are followed by seeds, which are easily carried by the wind.

Common names include flax-leaf fleabane, wavy-leaf fleabane, Argentine fleabane, hairy horseweed, asthma weed and hairy fleabane.[6]

Description

Erigeron bonariensis grows up to 75 cm (29.5 in) in height and its leaves are covered with stiff hairs, including long hairs near the apex of the bracts. Its flower heads have white ray florets and yellow disc florets. It can easily be confused with Erigeron canadensis, which grows taller, and E. sumatrensis.[7]

It flowers in August and continues fruiting until the first frosts. It is instantly recognisable by its blue-green foliage, very narrow, undulate stem-leaves, and purple-tipped involucral bracts. It reproduces only by seed, which are easily blown and spread by wind.

Habitat

Erigeron bonariensis is a rare alien in southeastern England, found along walls and in cracks in pavements and concrete driveways. It is widespread throughout Australia, where it thrives on roadsides, fallows, pastures, gardens, lawns, footpaths, parks, riparian vegetation, forest and wetland perimeters, waste dumps and disturbed grounds.[8][9]

References
  1. Tropicos, Erigeron bonariensis L.
  2. Flora of China, Erigeron bonariensis L. 1753. 香丝草 xiang si cao
  3. Comprehensive profile for Conyza bonariensis Archived 2006-11-10 at the Wayback Machine, Malta Wild Plants
  4. Conyza bonariensis, Flowers in Israel
  5. Altervista Flora Italiana, Cespica di Buenos Aires, Erigeron bonariensis L. includes photos and European distribution map
  6. "Conyza bonariensis". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 18 December 2017.
  7. Conyza bonariensis, International Environmental Weed Foundation
  8. Tall Fleabane by Agriculture of Victoria
  9. Brisbane City Council Weed Identification Tool


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