Robert W. Freckmann Herbarium

  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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