Erigeron annuus (Annual Fleabane)

Erigeron annuus (Annual Fleabane) on 5-31-18, #450-42).

Annual Fleabane, Eastern Daisy Fleabane

Erigeron annuus

er-IJ-er-on  AN-yoo-us

Synonyms of Erigeron annuusAster annuus L., 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 bellidioides Spenn., Erigeron diversifolius Rich. ex Rchb., Erigeron heterophyllus Muhl. ex Willd., Erigeron strigosus Bigelow, Phalacroloma acutifolium Cass., Phalacroloma annuum Dumort., Pulicaria annua Gaertn., Pulicaria bellidiflora Wallr., Stenactis annua (L.) Cass. ex Less., Stenactis annua Cass., Stenactis dubia Cass.

 Erigeron annuus (L.) Desf. is the accepted scientific name for the Annual Fleabane. It was named and described as such by René Louiche Desfontaines in Tableau de l’École de Botanique du Muséum d’Histoire Naturelle in 1804. It was first named Aster annuus by Carl von Linnaeus in the second edition of Species Plantarum in 1753.

Most databases and websites say Erigeron annuus (L.) Pers., as named and described by Christiaan Hendrik Persoon in Synopsis Plantarum in 1807. However, this scientific name and publication is an isonym since it was published after the original. I have sent emails and feedback to the top databases to have corrections made. IPNI (International Plant Names Index) records clearly states this name is an isonym… Once I hear back from Plants of the World Online by Kew, IPNI, and Tropicos to see what they say I will forward it on to other websites administrators.

The genus, Erigeron L., was named and described by Carl von Linnaeus in the second edition of Species Plantarum in 1753. 

As of 11-1-21 when this page was last updated, Plants of the World Online lists 454 species in the Erigeron genus. It is a member of the plant family Asteraceae with 1,678 genera. Those numbers could change as updates are made on POWO. The number of genera in the family fluctuates quite often.

Distribution map of Erigeron annuus from Plants of the World Online. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; http://www.plantsoftheworldonline.org/. Retrieved on November 1, 2021.

The above distribution map for Erigeron annuus is from Plants of the World Online. Areas in green are where the species is native and purple where it has been introduced. This map shows where the species has been introduced in other countries.

Distribution map for Erigeron annuus from the USDA Plants Database. Published on the internet at https://plants.sc.egov.usda.gov/home. Retrieved on November 1, 2021.

The above distribution map for Erigeron annuus is from the USDA Plants Database for North America above Mexico. It shows the species is native to more states than POWO.

The map on iNaturalist shows where members have made observations. Anyone can join and it is a great website to confirm and share your observations. The maps on iNaturalist are continually updated as members post new observations.

BONAP (The Biota of North America Program) maps are also very good. Clicking HERE will take you to the page of maps for all the Erigeron species in the United States. 

THERE ARE SEVERAL LINKS AT THE BOTTOM OF THE PAGE FOR FURTHER READING AND TO HELP WITH A BETTER POSITIVE ID.

Erigeron annuus (Annual Fleabane) on 10-6-18, #517-1.

There are quite a few colonies of Erigeron annuus (Annual Fleabane) growing on my farm, especially in the south hayfield. A very similar species, Erigeron strigosus (Daisy Fleabane), has narrower leaves otherwise they can be difficult to tell apart. One may also get them confused with species of Symphyotrichum at a glance, but Erigeron species have larger central discs (cones). There are more differences between the two genera but they do have features in common.

I apologize for not writing better descriptions, but I am updating pages, writing new pages, and adding photos I have taken over the summer, etc. It is a wintertime project but I do get behind…

Erigeron annuus (Annual Fleabane) on 10-6-18, #517-2.

 

Erigeron annuus (Annual Fleabane) on 10-6-18, #517-3.

 

Erigeron annuus (Annual Fleabane) without petals on 10-6-18, #517-4.

 

Erigeron annuus (Annual Fleabane) on 6-19-19, #592-16.

 

Erigeron annuus (Annual Fleabane) on 6-19-19, #592-17.

<<<<2021>>>>

Erigeron annuus (Annual Fleabane) on 10-12-21, 843-15.

 

Erigeron annuus (Annual Fleabane) on 10-12-21, 843-16.

 

Erigeron annuus (Annual Fleabane) on 10-12-21, 843-17.

 

Erigeron annuus (Annual Fleabane) on 10-12-21, 843-18.

 

Erigeron annuus (Annual Fleabane) on 10-12-21, 843-19.

 

Erigeron annuus (Annual Fleabane) on 10-12-21, 843-20.

 

Erigeron annuus (Annual Fleabane) on the right and Symphyotrichum pilosum (Hairy While Oldfield Aster) on the left on 10-22-21, #849-5.

The above photo is a comparison of the flowers of Erigeron annuus (Annual Fleabane) on the right and Symphyotrichum pilosum (Hairy White Oldfield Aster) on the left.

Erigeron annuus (Annual Fleabane) on 10-22-21, #849-6.

 

Erigeron annuus (Annual Fleabane) on 10-22-21, #849-7.

 

Erigeron annuus (Annual Fleabane) on 10-22-21, #849-8.

 

Erigeron annuus (Annual Fleabane) on 10-22-21, #849-9.

 

Erigeron annuus (Annual Fleabane) on 10-22-21, #849-10.

I have enjoyed photographing and learning about the many wildflowers growing on the farm in Windsor, Missouri in Pettis County (Henry County is across the street) and other areas. The city limits is also across the street and the north and south side of the farm. I have grown over 500 different plants and most have pages listed on the right side of the blog. I am not an expert, botanist, or horticulturalist. I just like growing, photographing and writing about my experience. I rely on several websites for ID and a horticulturalist I contact if I cannot figure them out. Wildflowers can be somewhat variable from location to location, so sometimes it gets a bit confusing. If you see I have made an error, please let me know so I can correct what I have written.

I hope you found this page useful and be sure to check the links below for more information. They were written by experts and provide much more information. Some sites may not be up-to-date but they are always a work in progress. If you can, I would appreciate it if you would click on the “Like” below and leave a comment. It helps us bloggers stay motivated. You can also send an email to me at thebelmontrooster@yahoo.com. I would enjoy hearing from you especially if you notice something is a bit whacky.

FOR FURTHER READING:
PLANTS OF THE WORLD ONLINE (GENUS/SPECIES)
INTERNATIONAL PLANT NAMES INDEX 
(GENUS/SPECIES)
TROPICOS (GENUS/SPECIES)
FLORA OF NORTH AMERICA (GENUS/SPECIES)
WORLD FLORA ONLINE (GENUS/SPECIES)
WIKIPEDIA (GENUS/SPECIES)
DAVE’S GARDEN
MISSOURI PLANTS
MSU-MIDWEST WEEDS AND WILDFLOWERS
iNATURALIST
WILDFLOWER SEARCH
USDA PLANTS DATABASE
ILLINOIS WILDFLOWERS
MINNESOTA WILDFLOWERS
KANSAS WILDFLOWERS AND GRASSES
PFAF (PLANTS FOR A FUTURE)
GO BOTANY
FLORA FINDER

NOTE: The data (figures, maps, accepted names, etc.) may not match on these websites. It depends on when and how they make updates and when their sources make updates. Some websites have hundreds and even many thousands of species to keep up with. Accepted scientific names change periodically and it can be hard to keep with as well. Some of the links may use a name that is a synonym on other sites. In my opinion, Plants of the World Online by Kew is the most reliable and up-to-date plant database and they make updates on a regular basis. I make updates “at least” once a year and when I write new pages or add new photos but I do get behind. We are all a work in progress. 🙂

 

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