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Plants of the Eloise Butler Wildflower Garden

The oldest public wildflower garden in the United States

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Common Name
Dense Blazing Star (Spiked Blazing Star, Forest Gayfeather, Marsh Gayfeather, Marsh Blazing Star, Dense Button Snakeroot, Sessile-headed Blazing Star)

 

Scientific Name
Liatris spicata (L.) Willd.

 

Plant Family
Aster (Asteraceae)

Garden Location
Upland

 

Prime Season
Late Summer to early Autumn

 

 

Blazing Stars (also called Gayfeathers) of the Liatris genus have general characteristics of: Stem leaves narrow and lance shaped; the flower heads, typically numbering 5 to 60 (but 160+ on a few species), appear on a spike, each flowerhead containing a number of small tubular 5-lobed pink-purple florets. Local variations in species populations will be observed. Rootstocks are corms and rhizomes.

L. spicata can grow from 2 to 6 feet in height. The stems are erect and usually smooth except for some sparse whitish hair, particularly on the lower stem and in the inflorescence.

The leaves are both basal and stem. The lower leaves are narrowly lanceolate in shape and up to 3/4 inch wide and 10 inches long. The stem leaves are alternate and become more narrow and linear reducing in size up the stem. Leaves are weakly gland-dotted but without glandular hairs.

The floral array is a densely packed spike of stalkless flower heads.

Flowers: Individual flower heads are small, only 1/2 inch wide with 5 to 8 (variation 4-14) florets which have a pinkish purple corollas with funnelform throats, without hair on the inside. The 5 lobes of the corolla slightly reflex. The stamens are not exserted from the throat but the style is and it is long and deeply bifurcated. The phyllaries around the outside of the flower head are in 4 to 5 series, ovate to oblong in shape, unequal in size. Tips are broadly rounded to obtuse. These are usually without hair but may have translucent margins. The tips do not reflex. Lower flower heads will have a visible linear green bract at the base, longer than the head.

Seed: Fertile flowers produce a dry seed (a cypsela), 4.5 to 6 mm long, that has bristly hair attached for wind dispersion. Seeds require 60 days of cold stratification to break dormancy.

Varieties: There are two recognized varieties - var. spicata and var. resinosa. The latter has phyllaries that are purplish to greenish with leaves reduced abruptly in size at mid-stem. The former has phyllaries that are usually greenish with gradual reduction in leaf length.

 

Habitat: This species of Liatris prefers full sun in well drained soil with wet to mesic moisture conditions. In the wild it will be found on bluffs, limestone outcrops and barrens. Long-tongued bees and butterflies will visit these plants. It grows from a globose to slightly elongated corm-like structure.

Names: The genus Liatris is an old name whose meaning has been lost. The species spicata, means 'spike bearing' and refers to the shape of the floral array. As you can see above, a number of common names have been attached to this plant. The Garden uses the same name as USDA whereas Flora of North America calls it Florist or Marsh Gayfeather. Wisconsin refers to it as Marsh Blazing Star. This is why scientific names are important. The author name for the plant classification, ‘Willd.’ is for Carl Ludwig Willdenow (1765-1812), German botanist, a founder of the study of the geographic distribution of plants. He was director and curator of the Botanic Garden of Berlin. He updated the work of the first person to classify - '(L.)' which refers to Carl Linnaeus (1707-1778), Swedish botanist and the developer of the binomial nomenclature of modern taxonomy.

Comparisons: The heads are not stalked like L. pycnostachya, where they also occur in a dense spike. Flower head phyllaries are rounded unlike L. pycnostachya where they are pointed and tend to curve backward. L. spicata and L. pycnostachya are difficult to distinguish without close inspection. See also Dotted Blazing Star, L. punctata, where the leaves are shorter and thinner and the phyllaries are much different - larger, oblong-ovate and with marginal hair.

See bottom of page for notes on the Garden's planting history, distribution in Minnesota and North America, lore and other references.

Plant drawing

Above: The floral array and top of stem with its fine leaves. Drawing from Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York.

Below: L. spicata will begin blooming in late July. 1st & 2nd photo - The flower head is a dense spike. The lack of flower bud stalks and the dense spike is similar to Prairie Blazing Star, L. pycnostachya. 3rd photo - The underside of the leaf - there are a few sparse hair on the midvein and this leaf is gland-dotted.

Dense Blazing Star Dense Blazing Star inflorescence detail leaf underside

Below: Flower heads have 5 to 8 florets which have a pinkish purple corollas with funnelform throats. The style is long and deeply bifurcated. The narrow, smooth linear leaves, which become finer near the top of the stem.

Dense Blazing Star flower detail leaves

Below: The basal leaves (bottom) compared to the upper stem leaves (top).

leaves

Below: Detail of the flower buds; 1st photo - note the rounded purplish phyllaries of var. resinosa. In the 2nd photo are the green phyllaries of var. spicata. These differ from the similar looking Prairie Blazing Star, L. pycnostachya where they are pointed with reflexed tips. Here the tips do not reflex.

Phyllaries Phyllaries

Notes:

Notes: Eloise Butler first recorded planting Dense Blazing Star in 1911 with plants obtained from Kelsey's Nursery on the East Coast and she planted more on May 1st 1912 - same source. In 1919 she got 12 from Horsford's Nursery in Charlotte, VT. Martha Crone planted also in 1936 from a source in Shakopee, MN and then added more in 1946, '51, '53, '54, and '56 in the development of the Upland Garden. She listed it on her 1951 Garden Census. This species is not native to Minnesota, but is native to SE Wisconsin and states eastward from the Mississippi river valley except New England. In Canada it is known in Ontario and Quebec. It is listed as a plant of "Special Concern" in Wisconsin.

In Minnesota five species of Liatris are considered native and several others have been reported but have never been collected. The native five are L. aspera, Rough Blazing Star; L. cylindracea, Ontario Blazing Star; L. ligulistylis, Large-headed (or Rocky Mountain) Blazing Star; L. punctata, Dotted Blazing Star; L. pycnostachya, Prairie Blazing Star.

References and site links

References: Plant characteristics are generally from sources 1A, 32, W2, W3, W7 & W8 plus others as specifically applied. Distribution principally from W1, W2 and 28C. Planting history generally from 1, 4 & 4a. Other sources by specific reference. See Reference List for details.

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