Bluets

Longleaf Summer Bluets Flower Among Blades of Grass

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A perennial yard weed that is really cute appears in late Spring and may be found flowering until mid-Summer. We see it in the lawn and near the edges of the lane where it grows in gravel and dry rocky soil at the top of the mountain ridge.

The trumpet-like flowers have a long bell with four flaring petals in white with tones of lavender. The flower buds are a rosey-pink to lavender color. Photos below taken on 8 Jun 2010.

Clusters of small trumpet-like flowers held above pairs of narrow leaves.
Clusters of small trumpet-like flowers held above pairs of narrow leaves.

Narrow, strap-like, sessile leaves are opposite one another on branching stems that barely reach ten inches tall.

Longleaf Summer Bluet, Houstonia longifolia, may also be known as Long-leaved Bluet. Its flowers are in small clusters and are more trumpet-like than the flowers of Bluets, which are not in clusters. Bluets have a way of holding their yellow eyed flowers up to the sun that the Longleaf Summer Bluet lacks. Its flowers are often held out to the sides.

Longleaf Summer Bluets bloom among the grass in the lawn.
Longleaf Summer Bluets bloom among the grass in the lawn.

In parts of New England the native Longleaf Summer Bluet is considered threatened. It is listed as endangered in Connecticut and Massachusetts, it’s of special concern in Maine, and it appears only in historical records in Rhode Island, which means the Longleaf Summer Bluet may already be extirpated there.

We seem to have plenty of the long-leaved bluet here on our mountain ridge in PA, but I haven’t seen it anywhere else.

Bluets Colonize the Open Field

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A dainty little flower that can truly be appreciated from afar is called Bluets, Houstonia caerulea. You never see just one Bluet, so I guess that’s why they’re called Bluets.

Bluets are perennials that have the ability to form large colonies. It is this ability that will probably draw your attention to this tiny little plant.

The Bluets colony in this field can be seen from afar.
The Bluets colony in this field can be seen from afar.

Light blue flowers form a great big colony in the field in the image above. The flowers stand taller than the surrounding grass, which was very short, and so appeared as a great big patch of light blue color in the field.

Bluets flowers colonize a grassy field.
Bluets flowers colonize a grassy field.

Open areas, grassy fields and yards are likely areas to find Bluets, but they can occur in other open areas. Below, a small group of Bluets were found growing on a wooded bank along a country road.

A small grouping of bluets on a wooded hillside.
A small grouping of bluets on a wooded hillside.

The white spots in the image above are bluets that were growing on a hill that faced the morning sun. (Photo taken 13Apr2010. All other photos taken 7Apr2010.)

Four-petaled flowers are held upright on a thin stem, 2 to 8 inches high. Light blue to white petals surround a yellow ring in the center of the flower. Petals are pointed and the flowers look rather symmetrical.

Bluets are four-petaled flowers in light blue with yellow centers.
Bluets are four-petaled flowers in light blue with yellow centers.

Leaves are smaller than the blossoms. Very thin and short, the leaves are paired on the flower stems which have a few larger basal leaves.

The Houstonia genus is represented by 20 species in our area, but distinguishing them requires examination of the flowers, fruit and seed shape. Microscopy must be used to see fine seed detail in order to identify Bluets to the species level. Exact identification would require collection of fruits and seeds and further examination. In general, we can just refer to these cute little flowers as Bluets.

According to Peterson’s Medicinal Plants Guide Native Americans used a leaf tea for bed-wetting. No other use is mentioned and apparently Bluets aren’t edible, so I guess we’ll just have to appreciate the little Bluets smiling in the millions from afar.

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