2021 Donald Burk 2017 Gary McDonald 2023 Ron Vanderhoff 2020 Diane Etchison 2023 Ron Vanderhoff 2023 Ron Vanderhoff 2008 Jorg Fleige 2009 Neal Kramer 2009 Neal Kramer 2017 Michelle Tollett 2023 Ron Vanderhoff 2023 Ron Vanderhoff 2023 Ron Vanderhoff 2021 Charles Hinkle 2017 Diane Etchison 2022 Ron Vanderhoff 2021 Donald Burk 2016 John Doyen
Erigeron bonariensis is an annual herb that is not native to California.
[Wikipedia] Non-native Info, Description, Distribution, Habitat: Erigeron bonariensis is a species in the family Asteraceae, 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. Common names include flax-leaf fleabane, wavy-leaf fleabane, Argentine fleabane, hairy horseweed, asthma weed and hairy fleabane.
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 of E. bonariensis include flax-leaf fleabane, wavy-leaf fleabane, Argentine fleabane, hairy horseweed, asthma weed and hairy fleabane.
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.
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.
Distribution and habitat
Erigeron bonariensis is 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.
E. 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. (contributed by Mary Ann Machi)
/app/up/entry/299/th/89839.jpg:!/app/up/mg/45/th/13654.jpg:!/app/up/io/360/th/io108168-2.jpg:!/app/up/entry/123/th/37090.jpg:!/app/up/io/272/th/io81870-1.jpg:!/app/up/io/360/th/io108168-1.jpg:!0000 0000 0108 1755:!0000 0000 1209 0067:!0000 0000 1209 3710:!/app/up/cbo/254/th/76402.jpg:!/app/up/io/360/th/io108168-0.jpg:!/app/up/io/285/th/io85647-0.jpg:!/app/up/io/272/th/io81870-0.jpg:!/app/up/io/189/th/io56813-1.jpg:!/app/up/entry/74/th/22476.jpg:!/app/up/entry/458/th/137691.jpg:!/app/up/entry/373/th/112121.jpg:!0000 0000 1216 1220:!
2021 Donald Burk:!2017 Gary McDonald:!2023 Ron Vanderhoff:!2020 Diane Etchison:!2023 Ron Vanderhoff:!2023 Ron Vanderhoff:!2008 Jorg Fleige:!2009 Neal Kramer:!2009 Neal Kramer:!2017 Michelle Tollett:!2023 Ron Vanderhoff:!2023 Ron Vanderhoff:!2023 Ron Vanderhoff:!2021 Charles Hinkle:!2017 Diane Etchison:!2022 Ron Vanderhoff:!2021 Donald Burk:!2016 John Doyen:!
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2023. Berkeley, California:The Calflora Database
[a non-profit organization].Available: