Wildflowers of South Mill St., Hopkinton, Mass.

Asternext


Asters

Sunflowers, Asters, Goldenrods and Daisies belong to the largest family of flowering plants, the Sunflower or composite family (Asteraceae or Compositae) containing 19,000 species worldwide. They are considered the most recent to appear on earth.

Among Asters, some books list 50 varieties growing in the northeast, and many are far too similar for positive identification by amateurs. Even with two plants in hand, it is difficult to tell whether they are the same or different species. To quote Newcomb, the Asters and Goldenrods are genera that “only the most persistent field botanist will attempt to master.” A dozen or so Asters are shown in this catalog, though some of the identifications here should be suspect.

The words “asterisk” and Aster both come from Latin and Greek for “star.”

Asters are often planted as ornamentals, though they can succumb to aster yellows or aster wilt, which kills them over a period of months or years.

Asters are considered late summer and fall flowers, often blooming after most other flowers are gone. However several have an extended period of bloom beginning much earlier. Most prefer dry, partially cleared areas, while a few like to be close to the edges of wetlands.

Bushy Aster Aster dumosus Sunflower Family (Asteracae)

Unlike most of the other Asters in this area that are white, this flower is pale lavender. The flowers are small (1/2-3/4" wide) and the color does not show up too well in photos. There are numerous tiny leaves on the flower stem. This identification is somewhat suspicious since this Aster is is usually restricted to coasts and shorelines, but in fact here we have this within 50' of the pond. A re-identification is be needed to determine whether bracts are narrow or spreading (which would make it a Many-flowered Aster). email

BushyAster
BushyAsterFlowers
BushyAsterLeaves
Calico or Starved Aster Aster lateriflorus Sunflower Family (Asteracae)

A very common late-September Aster with numerous small 1/2" flowers. There are several very similar interpreeding Asters difficult to distinguish. The leaves and shape of the plant seem quite variable. email

CalicoAster
CalicoAsterFlower
CalicoAsterClose
CalicoAsterBunch

CalicoAsterColors
The common name comes from the multiple shades the flower takes on as it ages, although several other Asters also do this

CalicoAsterTeeth
Most references say the leaves are distinctly toothed, although the teeth can be faint or nonexistent in some leaves

Flat-topped (White) Aster Aster umbellatus Sunflower Family (Asteracae)

This Aster was not found near South Mill St., although the habitat should support it. This photo was taken along the rocky coast of Maine, on Mount Desert Island in mid-September. This Aster is generaly found in moist thickets and borders of swamps. It is one of the first Asters to bloom, while persisting well into the fall.

The distinguishing characteristic of this Aster is the very broad, flat top. email

FlatToppedAster
Large-leaved Aster Aster macrophyllus Sunflower Family (Asteracae)

The very large heart-shaped basal leaves are a distinguishing feature, as well as minute glands on the flower stalks (not shown). Also the flowers are usually lavender. email

LargeLeavedAsterFlowers
LargeLeavedAsterLeaves
Heart-leaved Aster Aster cordifolius Sunflower Family (Asteracae)

This aster has violet flowers, heart-shaped toothed leaves, and dark-green tips on the bracts of the flower heads. email

HeartLeavedAsterTop
New England Aster Aster novae-angliae Sunflower Family (Asteracae)

This is aptly named, as it is the most showy Aster in the northeast, having large flowers with 45-100 rays. email

NewEnglandAster
The untoothed leaves are relatively crowded on the stem

NewEnglandAsterFlower

NewEnglandAsterLeaf
The stem is hairy and the leaves are clasping

New York Aster Aster novae-belgii Sunflower Family (Asteracae)

This Aster grows in damp thickets, swamps and along the coast. This specimen was growing next to the coast on Mt. Desert, Maine, one of the few wildflowers in this catalog photographed outside the South Mill St. area.

A distinguishing feature of this Aster is the outword-curving tips on the bracts of the flower heads. email

NewYorkAsterTop
NewYorkAsterSide
NewYorkAsterBracts
Sharp-leaved, Mountain or Whorled Wood Aster Aster acuminatus Sunflower Family (Asteracae)

The most distinguishing identifying feature of this Aster is the apparently whorled leaves near the top, although in fact they are very closely spaced and alternate. The upper leaves are larger than the lower and clasp the stem only slightly. It has 1" showy flowers, whose centers vary in color from yellow to brown as the flowers age. When the petals fall off, they flower stems end in fuzzy balls. It blooms early compared to most Asters, in mid-August, and is fairly common by the roadside. email

SharpLeavedAster
SharpLeavedAsterFar
SharpLeavedAsterWhorls
SharpLeavedAsterHead
SharpLeavedAsterTop
SharpLeavedAsterWhole
SharpLeavedAsterWhole1
SharpLeavedAsterWhorled
SharpLeavedAsterWithering
Small White or Small-Flowered Aster Aster vimineus Sunflower Family (Asteracae)

This plant resembles the Bushy Aster (A. dumosus) which this sample may be, though the latter usually has pale lavender or bluish flowers. There are many other small-flowered asters in the northeast difficult to tell apart. email

SmallWhiteAster
Smooth Aster Aster laevis Sunflower Family (Asteracae)

This specimen was originally identified as a New England Aster due to its slightly clasping leaves and flowers with numerous rays. However the stem is not sticky or hairy, and has a whitish bloom characteristic of the Smooth Aster. But there are 11 closely related species in this area so this identification is only approximate. email

SmoothAsterTop
White Wood Aster Aster divaricatus Sunflower Family (Asteracae)

The flowers are supposed to be very similar to the Large Leaved Aster, the two species differing mostly in the properties of the basal leaves. email

WhiteWoodAster
WhiteWoodAsterFlowersBlack
WhiteWoodAsterImmature
WhiteWoodAsterLeaf
Unknown Aster Aster ? Sunflower Family (Asteracae)

This Aster has rather wide lance-shaped untoothed leaves, with numerous flowers growing out of stalks in the leaf axils. It seems different from every Aster listed in the references. email

UnknownAsterA
UnknownAsterAAxils
UnknownAsterAFlowers
UnknownAsterALeaves
Another Unknown Aster Aster ? Sunflower Family (Asteracae)

This Aster has eaves toothed above the middle, barely clasping the stem, and about 7 rays in a cluster at the top. The basal leaves are different from that of any Aster listed in the references. email

UnknownAsterB
UnknownAsterBLeaves

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Entire contents ©2005 by Morrie Gasser except where noted.