Houstonia (Bluet) is a genus of plants in the Rubiaceae family. Many species were formerly placed (along with other now-segregate genera) in a more inclusive Hedyotis.
Bluets are often small and delicate. For example, H. rosea may attain a height of only one inch. Some species have a single-stem, while others are more "bunchy." Flowers may be blue, purple, lavender, white, or rose, often with shades of one color present in a single population. Flowers have four sepals, a salverform corolla with four lobes, and an inferior ovary. Some species exhibit heterostyly. The fruit is many-seeded capsule which usually dehisces via a suture across the apex; often the capsule is roughly heart-shaped.
Houstonia consists of 20 species native to North America. Another five species are classified in the genus Stenaria (Houstonia without Stenaria is paraphyletic). Close relatives of the genus are Oldenlandia microtheca and, more distantly, Arcytophyllum.
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- "World Checklist of Selected Plant Families".
- Edward E. Terrell (Jun 10, 1996), "Revision of Houstonia (Rubiaceae-Hedyotideae)", Systematic Botany Monographs (American Society of Plant Taxonomists) 48: 1–118, doi:10.2307/25027862, JSTOR 25027862
- Sheri A. Church and Douglas R. Taylor (2005), "Speciation and hybridization among Houstonia (Rubiaceae) species: the influence of polyploidy on reticulate evolution", American Journal of Botany 92 (8): 1372–1380, doi:10.3732/ajb.92.8.1372
- Groeninckx, I., Dessein, S., Ochoterena, H., Persson, C., Motley, T.J., Kårehed, J., Bremer, B., Huysmans, S., Smets, E. (2009). "Phylogeny of the Herbaceous Tribe Spermacoceae (Rubiaceae) Based on Plastid DNA Data". Annals of the Missouri Botanical Garden 96 (1): 109–132. doi:10.3417/2006201.
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