Symphyotrichum foliaceum variety apricum

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   The Symphyotrichums (formerly Asters) shown on this page are very similar and they are both highly variable in height, leaf shape and length, hairiness, habitat, petal color, and phyllary characteristics.  Distinguishing between the two species is difficult. 

   Following are several characteristics that help separate S. foliaceum from S. spathulatum

1) S. foliaceum phyllaries tend to be broader, longer, and rounded at the apex.  

2) S. foliaceum middle stem leaves are less than seven times as long as wide. Overall the leaves of this plant tend to be elliptic to lance shaped.  They are generally shorter and wider than S. spathulatum which tends to have linear to lance-shaped leaves.

S. spathulatum middle stem leaves are more than seven times as long as wide.

3) S. foliaceum basal leaves are usually withered at flowering time (anthesis); S. spathulatum basal leaves are usually present at flowering time.

   Flower color in both species is highly variable through all shades of blue/purple/pink/white.

   The Flora of North America notes that "Symphyotrichum foliaceum is extremely variable" and "Symphyotrichum spathulatum is a variable species".  The Flora does not specifically mention the length to width ratio of the middle stem leaves of the two species, but it gives measurements that support this distinction. (See S. foliaceum and S. spathulatum.)

   The name "foliaceum" refers to the foliage-like phyllaries and bracts subtending the phyllaries of Symphyotrichum foliaceum.  "Spathulatum" is Greek for "like a spatula" and the name refers to the leaf shape.  But each species is so highly variable in these two characteristics, that the specific epithets are only broadly applicable.

    In 1995 Asteraceae expert Guy Nesom proposed, on the basis of extensive analysis, moving many members of the genus "Aster" (including the two shown on this page) to the genus "Symphyotrichum"; the new genus name is now accepted. 

    "Sym phyo trichum" is Greek for "with growing hairs" or "with hairs coming together" and perhaps refers to the long lines of hairs sometimes seen on these plants.

Symphyotrichum foliaceum variety apricum

Symphyotrichum foliaceum variety apricum

Symphyotrichum foliaceum variety apricum. Synonym: Aster foliaceus. (Leafy Aster)
Asteraceae (Sunflower Family)

Montane, subalpine, alpine. Woodlands, wetlands, openings, disturbed. Summer, fall.
Upper Calico Trail, July 22, 2015.

This variety of Symphyotrichum is distinguished by its shorter stature (to 8 inches tall); fine, continuous line of stem hairs; and rounded, purple-edged phyllaries in several rows. The closed, overlapping ray flowers are dark purple, but they will be much lighter when they open.

Symphyotrichum foliaceum variety apricum tends to grow at higher altitudes than the two varieties shown below.

 

Symphyotrichum foliaceum

Symphyotrichum foliaceum variety canbyi. Synonym: Aster foliaceus. (Leafy Aster)
Asteraceae (Sunflower Family)

Foothills, montane. Woodlands, openings. Summer, fall.
Upper Calico Trail, August 15, 2013.

Symphyotrichum foliaceum

Symphyotrichum foliaceum variety canbyi. Synonym: Aster foliaceus. (Leafy Aster)
Asteraceae (Sunflower Family)

Foothills, montane. Woodlands, openings. Summer, fall.
Navajo Lake Trail, August 30, 2007.

Symphyotrichum foliaceum varieties grow from five to twenty-eight inches tall and are commonly found in small colonies that arise from spreading roots. Basal leaves are often withered at flowering time and stem leaves are broad, prominently veined, and reduced in size and number upwards.  Hairs are often in one to few straight lines on the stem below the leaf base (see above and below).  

Linnaeus named the Aster genus in 1753 and John Lindley named this species in 1836 from a specimen collected by Fischer in Unalaschka.  In 1995 Guy Nesom proposed moving many members of the Aster genus to Symphyotrichum and that proposal is now accepted by most botanists. The Symphyotrichum genus was named by Christian Nees in 1832. 

Trichomes are hairs and "symphy" means "coming together".  So "Symphyotrichum" refers to hairs growing together, probably referring to the line of hairs common on this species. S. foliaceum gets its name from its (usually) long and broad, leaf-like (foliage-like) outer phyllaries and its commonly very leaf-like bracts subtending the involucre.

Symphyotrichum foliaceum
Symphyotrichum foliaceum variety parryi. Synonym: Aster foliaceus. (Leafy Aster)
Asteraceae (Sunflower Family)

Montane, subalpine. Woodlands, openings. Summer, fall.
Navajo Lake Trail, August 30, 2007.

Outer phyllaries are longer than the inner on this variety of S. foliaceum.

Symphyotrichum foliaceum

Symphyotrichum foliaceum

 
Symphyotrichum foliaceum variety parryi and Symphyotrichum foliaceum variety canbyi. Synonym: Aster foliaceus. (Leafy Aster)
Asteraceae (Sunflower Family)

Montane, subalpine. Woodlands, openings. Summer, fall.
Foothills, montane. Woodlands, openings. Summer, fall.
Upper Calico Trail, August 15, 2013 and Mesa Verde National Park, September 8, 2007.

A major factor separating Symphyotrichum species and varieties is the color and size of their phyllaries, but the differences are often difficult to discern and characteristics of the varieties overlap. The top photograph at left shows variety parryi's inner and outer phyllaries about the same length; the bottom photograph shows variety canbyi's longer outer phyllaries.

See below for the phyllaries most typical of S. spathulatum.

Symphyotrichum foliaceum

 
Symphyotrichum foliaceum variety parryi. Synonym: Aster foliaceus. (Leafy Aster)
Asteraceae (Sunflower Family)

Foothills, montane. Fields, openings, disturbed areas. Summer, fall.
Upper Calico Trail, August 15, 2013.

The photograph at left shows that although there are hairs all over the stem of this S. foliaceum plant, most hairs are massed in a straight, narrow, vertical line and that they are in line with the edge of the leaf base (near top of the photograph). You can see that the leaf base clasps the stem and the hairs reach to the base.

Weber indicates that such hair lines are a hallmark of Symphyotrichum lanceolatum and the leaf line separates this species from S. foliaceum and S. spathulatum; other botanical experts disagree. The stem at left supported the flower shown in the S. foliaceum var. parryi photograph directly above.

Symphyotrichum spathulatum
 
Symphyotrichum spathulatum.  Synonym: Aster spathulatus. (Spatula Aster)
Asteraceae (Sunflower Family)

Montane. Meadows, openings, streamsides. Summer, fall.
Wildcat Trail, August 28, 2007.

Symphyotrichum spathulatum grows from four to twenty inches tall and occurs in colonies that arise from strong, spreading roots.  Basal leaves are usually narrow and up to five inches long and stem leaves are progressively shorter and narrower.  Hairs (either upright or arched) are only on the leaf edges.

Symphyotrichum spathulatum

  

Symphyotrichum spathulatum
 
Symphyotrichum spathulatum.  Synonym: Aster spathulatus. (Spatula Aster)
Asteraceae (Sunflower Family)

Montane. Meadows, openings, streamsides. Summer, fall.
Wildcat Trail, August 28, 2007.

Look carefully at the phyllaries of Symphyotrichum spathulatum and you will notice that they are dark green at the tips and much lighter green, even almost white near the center and bottom.  You can see the white in the lower right bud.  Phyllaries are in several rows and the outer phyllaries are typically shorter, as in these flowers, but may all be about the same length.

If you compare these phyllaries with those of S. foliaceum (above) you will see that S. spathulatum phyllaries are narrow, variable in length, and the tip is rather small and not sharply pointed; the phyllaries of S. foliaceum are most often broad, relatively equal in length (outer phyllaries are often even longer that inner ones), and the tip is often rounded but may be acute or obtuse, sometimes (according to A Utah Flora) even with a finely drawn out tip.

Unfortunately, however, the phyllary characteristics described above for one species sometimes fit the other, making a distinction between the two species difficult. 

Symphyotrichum spathulatum
Symphyotrichum spathulatum. Synonym: Aster spathulatus. (Spatula Aster)
Asteraceae (Sunflower Family)

Montane. Meadows, openings, streamsides. Summer, fall.
Wildcat Trail, August 28, 2007.

Linnaeus named the Aster genus in 1753 and John Lindley named this species in 1834 from a specimen collected by John Richardson on the Mackenzie River of Canada.  In 1995 Guy Nesom proposed moving many members of the genus "Aster" to the genus "Symphyotrichum"; that genus name is now accepted.  "Spathulatum" means "spatula-shaped". The Symphyotrichum genus was named by Christian Nees in 1832. 

Symphyotrichum spathulatum
Symphyotrichum spathulatum. Synonym: Aster spathulatus. (Spatula Aster)
Asteraceae (Sunflower Family)

Montane. Meadows, openings, streamsides. Summer, fall.
Wildcat Trail, August 28, 2007.

Ray flower numbers can vary from 15-40 and rays can vary from 1-2 millimeters wide and 9-15 millimeters long. This flower head has about 32 rays whereas those in the above photographs have about 24.

In very bright sunlight, flowers of many species may appear white even though they are light blue/violet/purple. Notice the violet showing in the ray flowers in shade, especially at 4 and 7 o'clock.

Symphyotrichum spathulatum
Symphyotrichum spathulatum. Synonym: Aster spathulatus. (Spatula Aster)
Asteraceae (Sunflower Family)

Montane. Meadows, openings, streamsides. Summer, fall.
Boggy Draw Trails, September 26, 2013.

Almost all of the yellow tubular disc corollas have slipped off the white styles with their split ends. Below the styles you can see the pappus hairs.

Range maps © John Kartesz,
Floristic Synthesis of North America

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Species present in state and native
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Range map for Symphyotrichum foliaceum

Symphyotrichum foliaceum var. apricum

Range map for Symphyotrichum foliaceum var. apricum

Symphyotrichum foliaceum var. apricum

Range map for Symphyotrichum foliaceum var. canbyi

Symphyotrichum foliaceum var. parryi

Range map for Symphyotrichum foliaceum var. parryi

Range map for Symphyotrichum spathulatum