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Photographer: Robert W. Freckmann
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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
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| 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 |
| (Glossary) |
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