Hedyotis longifolia (Long-leaf Bluets)

Plant Info
Also known as: Long-leaf Houstonia, Long-leaf Summer Bluet
Family:Rubiaceae (Madder)
Life cycle:perennial
Habitat:part shade, sun; dry, rocky or sandy soil, prairies, open woods
Bloom season:June - August
Plant height:3 to 10 inches
Wetland Indicator Status:none
MN county distribution (click map to enlarge):Minnesota county distribution map

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Detailed Information

Flower: Flower shape: 4-petals Flower shape: tubular Cluster type: flat

[photo of flowers] Flowers are clustered in 2s or 3s at the end of branching stems in the upper part of the plant. Individual flowers are about ¼ inch across, white to pale blue or occasionally pink, tubular with 4 sharply pointed lobes and 4 stamens with creamy white to yellow tips that turn blackish with age. The inside of the tube is hairy. The bracts at the base of the tube are narrowly triangular and about 1/8 inch long. Flower buds are often pink.

Leaves and stem: Leaf attachment: opposite Leaf type: simple

[photo of leaves] Leaves are narrow, to 1¼ inches long and ¼ inch wide, toothless and hairless, stalkless with a pointed tip. Attachment is opposite and there is a small whitish triangular appendage (stipule) on opposite sides the leaf node. The main stem is smooth and 4 sided, with rounded corners.


Long-leaf Bluets more often go by Latin name Houstonia longifolia, but the accepted name in Minnesota is Hedyotis longifolia.

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More photos

Photos by K. Chayka taken at Wild River and Interstate State Parks, Chisago County. Photos courtesy Peter M. Dziuk taken in Chisago County.


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

Posted by: Sue - Interstate State Park, Taylors Falls side
on: 2011-03-13 17:55:02

I saw these last summer while photographing the area.

Posted by: Carole - Wild River State Park, Center City MN
on: 2012-08-19 16:08:49

Saw some of these blooming today, Aug 19, 2012 at wild river. Saw what looked like blue-eyed grass in August, did a double take and went to check them out! What a sweet little flower!

Posted by: Jodi - Minnehaha Falls
on: 2013-08-25 16:43:08

These are blooming all over on the lower paths by the falls.

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