Robert W. Freckmann Herbarium


Because of technology changes and personnel changes at UWSP and the Wisconsin State Herbarium, the database of plant species housed at this site was merged with the database from the OLD WisFlora website to create a new Flora of Wisconsin website at Currently we are encouraging all Wisplant viewers to begin using the Flora of Wisconsin website as soon as possible. Wisplants will remain operational through July 13th. After that date, all traffic to Wisplants will be redirected to the Flora of Wisconsin website.

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  Houstonia caerulea L. image
Photographer: Robert W. Freckmann           

Botanical Illustration

Eric J. Epstein

Kitty Kohout
Family Rubiaceae
Houstonia caerulea L.
azure bluets, bluets, innocence, Quaker-ladies
Houstonia: for Dr. William Houston, English botanist, who collected in Tropical America
caerulea: blue
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Special Concern
Plant: erect, perennial, 2"-8" tall forb; fragile rhizomes in clumps up to 4" wide
Flower: light blue with a pale yellow center, 4-parted, 1/3"-1/2" wide, tubular with a flaring mouth, smooth throat; 1 flower per stalk, both terminal and from the upper leaf axils; blooms May-June
Fruit:flat capsule, much wider than long
Leaf:opposite, smooth, lower leaves on stalks about the same length as the blade, upper leaves almost stalkless
Habitat: moist; prairies, meadows

More Information Natural Communities Herbarium Specimens
All Houstonia list Ethnobotany Information Google- Images or Text
Hedyotis caerulea (L.) Hook.
Houstonia caerulea L. var. faxonorum Pease & A.H.Moore
Oldenlandia caerulea (L.) A.Gray

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