Ontario Wildflowers website

Asters Group

To see all  Asters  in order by Common Name     START HERE

Composite Family (Asteraceae)

Asters are very challenging to learn to identify. The individual species are in some cases highly variable. And the features that distinguish them are often very subtle, or occur in several species. Hybrids add to the confusion! To compound all these difficulties, some Asters have conflicting common names. Many beginning wildflower enthusiasts, and even some experienced ones, are simply content to just call them all "Asters", without concerning themselves about which species a particular plant might be. However, they aren't really all that hard to learn.

IMPORTANT NOTE: Recent genetic work done on Asters has shown that most species we have previously referred to as "Asters" are not Asters at all! They merely look like Asters! However, since they are still referred to as "Asters" in their common names, they are all still included on this website in the "Asters" group.

Common Names of Asters:
Asters have many common names. The ones listed here are the ones that I use for these species. If you're learning Asters, you would be well advised to learn their Latin names as well as their common names or you risk a lot of confusion when you refer to various wildflower books.

Latin Names of Asters:
Many of the established Latin names of Aster species have been changing lately due to DNA and genetic research that is being done on all plants. I have tried in all cases to list all Latin names that have been in use for each species, but there may be some for which this website is not up to date.

Please also see the following...

Here is a list of Aster species featured on this website. The common names listed here are the names that are used on this website for these species. If you're learning Asters, you would be well advised to also learn their Latin names as well, in order to avoid confusion.

Upland White Aster (Solidago ptarmicoides) -- this is technically not an Aster - it is now classed as a Goldenrod, in spite of its common name! -- See the Goldenrod section. However, it has been included in both groups on this website for your convenience.

Some other Aster species that grow in Ontario which are not yet featured on this website

  • Low Rough Aster (Eurybia radula)
  • Pringle's Aster (Symphyotrichum pilosum)
  • Robyn's Aster (Symphyotrichum robynsianum)
  • Short's Aster (Symphyotrichum shortii)
"I am half dead with Aster. I got on very fairly until I got to the thick of the genus, around what I call the Dumosi and Salicifolia. Here I work and work, but make no headway at all. I can't tell what are species and how to define any of them ..... I was never so boggled ..... If you hear of my breaking down utterly, and being sent to an asylum, you may lay it to Aster, which is a slow and fatal poison."
-- Asa Gray, late in his life


Amethyst Aster (Symphyotrichum x amethystinum)
Amethyst Aster
(Symphyotrichum x amethystinum)
Arrow-leaved Aster (Symphyotrichum urophyllum)
Arrow-leaved Aster
(Symphyotrichum urophyllum)
Azure Aster (Symphyotrichum oolentangiense)
Azure Aster
(Symphyotrichum oolentangiense)
Bog Aster (Oclemena nemoralis)
Bog Aster
(Oclemena nemoralis)
Calico Aster (Symphyotrichum lateriflorum)
Calico Aster
(Symphyotrichum lateriflorum)
Flat-topped White Aster (Doellingeria umbellata)
Flat-topped White Aster
(Doellingeria umbellata)
Fringed Blue Aster (Symphyotrichum ciliolatum)
Fringed Blue Aster
(Symphyotrichum ciliolatum)
Frost Aster (Symphyotrichum pilosum)
Frost Aster
(Symphyotrichum pilosum)
Heart-leaved Aster (Symphyotrichum cordifolium)
Heart-leaved Aster
(Symphyotrichum cordifolium)
Heath Aster (Symphyotrichum ericoides)
Heath Aster
(Symphyotrichum ericoides)
Large-leaved Aster (Eurybia macrophylla)
Large-leaved Aster
(Eurybia macrophylla)
New England Aster (Symphyotrichum novae-angliae)
New England Aster
(Symphyotrichum novae-angliae)
Ontario Aster (Symphyotrichum ontarionis)
Ontario Aster
(Symphyotrichum ontarionis)
Panicled Aster (Symphyotrichum lanceolatum)
Panicled Aster
(Symphyotrichum lanceolatum)
Purple-stemmed Aster (Symphyotrichum puniceum)
Purple-stemmed Aster
(Symphyotrichum puniceum)
Rayless Annual Aster (Symphyotrichum ciliatum)
Rayless Annual Aster
(Symphyotrichum ciliatum)
Rush Aster (Symphyotrichum boreale)
Rush Aster
(Symphyotrichum boreale)
Shreber's Aster (Eurybia schreberi)
Shreber's Aster
(Eurybia schreberi)
Small Salt Marsh Aster (Symphyotrichum subulatum)
Small Salt Marsh Aster
(Symphyotrichum subulatum)
Smooth Aster (Symphyotrichum laeve)
Smooth Aster
(Symphyotrichum laeve)
Upland White Aster (Solidago ptarmicoides)
Upland White Aster
(Solidago ptarmicoides)
White Wood Aster (Eurybia divaricata)
White Wood Aster
(Eurybia divaricata)
Whorled Aster (Oclemena acuminata)
Whorled Aster
(Oclemena acuminata)
Willow Aster (Symphyotrichum praealtum)
Willow Aster
(Symphyotrichum praealtum)
To see all  Asters  in order by Common Name     START HERE