Eurybia macrophylla (Large-leaved Aster)

Plant Info
Also known as: Big-leaf Aster
Genus:Eurybia
Family:Asteraceae (Aster)
Life cycle:perennial
Origin:native
Habitat:part shade, shade; open woods
Bloom season:July - October
Plant height:1 to 4 feet
Wetland Indicator Status:GP: FACU MW: FACU NCNE: UPL
MN county distribution (click map to enlarge):Minnesota county distribution map
National distribution (click map to enlarge):National distribution map

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Detailed Information

Flower: Flower shape: 7+petals Cluster type: flat Cluster type: panicle

[photo of flowers] Branching clusters, typically flat-topped, of 8 to 90 stalked flowers at the top of the stem. Flowers are ½ to 1¼ inch across with 9 to 20 narrow, pale blue to violet or nearly white petals (ray flowers) irregularly spaced around the small, yellow, center disk. The disk flowers turn reddish brown with age.

[photo of bracts] Surrounding the base of a flower are hairy, appressed bracts in 4 to 6 layers. Bracts are green or tinged purple, have whitish edging, and are generally oblong with a blunt tip. Flower stalks are up to 1½ inches long, stiff and covered in short glandular hairs.

Leaves and stems: Leaf attachment: alternate Leaf attachment: basal Leaf type: simple

[photo of leaves] Leaves are firm, coarsely toothed, surfaces hairless to sparsely hairy and more densely hairy along major veins on the underside. Lowest leaves are large and heart-shaped, up to 8 inches long and 6 inches wide, on long stalks, becoming progressively smaller, more egg-shaped, and shorter stalked as they ascend the stem, with the uppermost leaves reduced to stalkless bracts. Flowering plants have basal leaves that wither away by flowering time; the basal leaves of non-flowering plants may persist longer.

[photo of winged leaf stalk] Leaf stalks are narrowly to broadly winged, becoming more pronounced as leaves ascend the stem, the middle to upper leaves often with a pair of small lobes (auricles) at the base of the stalk that clasp the stem. Stems are erect, stiff, unbranched, hairless to sparsely hairy. Plants can create sizable, dense colonies from branching rhizomes.

Fruit: Fruit type: seed with plume

Fruit is a dry seed with a tuft of dull yellowish brown to orange-brown hairs to carry it off in the wind.

Notes:

Large-leaved Aster, formerly Aster macrophyllus, is a common sight in Minnesota's woodlands and forests, the tell-tale carpet of large, heart-shaped basal leaves seen in early to mid summer a sign of things to come. The large lower and basal leaves are the most recognizable characteristic, particularly the density of any given population, and distinguish this from other blue-flowered asters that may be found in woodland habitats.

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More photos

Photos by K. Chayka taken at Jay Cooke State Park, Carlton County, Wild River State Park, Chisago County, Iona Beach SNA, Lake County, and in Hubbard County. Photos courtesy Peter M. Dziuk taken in Lake County and his backyard garden in Ramsey County.

Comments

Have you seen this plant in Minnesota, or have any other comments about it?

Posted by: Estel - Minneapolis
on: 2011-09-17 17:19:04

I'm pretty sure this is the plant I found. I've just recently noticed them, I guess they must bllom in the fall. They are along roadsides & in peoples gardes. Very pretty.

Posted by: Leslie
on: 2012-05-09 13:45:54

Is it true that these plants give off a substance that inhibits the growth of nearby plants? I see it mixed with other plants in the woods, but wonder if there are certain species that can't grow near it.

Posted by: K. Chayka
on: 2012-05-10 08:15:56

Leslie, the term is alleopathy. Many plants have this trait to some degree but other species are adapted to it better than others. Big-leaf aster may be alleopathic to some other species (don't ask me which), but I don't recall ever seeing a big-leaf aster mono-culture anywhere, either. There's my unscientific observation :)

Posted by: Suzanne - Albert Lea
on: 2013-10-04 20:03:02

I spotted a few of these along Albert Lea Lake in September. It was a pleasant surprise since they are known for being north of the Twin Cities. They have the prettiest blue flowers on them.

Posted by: Jane - rural Inver Grove Heights, Dakota County
on: 2014-08-18 14:56:11

I've grown A. macrophyllus from seed, but the only one blooming on 8/18/14 looks more like A. undulatus. Lower part of leaves seem to clasp the stem, as described by Peterson/McKenny field guide. These flowers are pale blue, and I thought previous year's blooms were white. Seed from Prairie Moon 2010 or before.

Posted by: Cindy - Mankato
on: 2015-09-24 22:03:27

We have seen this plant growing along roadside and edges of ravines in Mankato. It has been particularly abundant and pretty to see these past few weeks (late September).

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